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20MnTiB simbi ndiyo inonyanya kushandiswa-yakasimba bhoti zvinhu zvemabhiriji ekugadzirwa kwesimbi munyika yangu, uye kuita kwayo kwakakosha zvikuru pakushanda kwakachengeteka kwemabhiriji. Zvichienderana nekuferefetwa kwemamiriro ekunze muChongqing, chidzidzo ichi chakagadzira kugadzirisa kwecorrosion kutevedzera mamiriro ekunze ane hunyoro eChongqing, uye kuita bvunzo yekusagadzikana kwemamiriro ekunze. Chongqing. Mhedzisiro yetembiricha, pH kukosha uye simulated corrosion solution concentration pane stress corrosion maitiro e20MnTiB high-simba mabhaudhi akadzidzwa.
20MnTiB simbi ndiyo inonyanya kushandiswa yakakwirira-yakasimba bhaudhi zvinhu zvesimbi mabhiriji ekugadzira mabhiriji munyika yangu, uye kuita kwayo kunokosha zvikuru pakushanda kwakachengeteka kwemabhiriji.Li et al. 1 yakaedza zvimiro zve20MnTiB simbi inowanzo shandiswa mugiredhi 10.9 yakakwirira-simba mabhaudhi mune yakakwirira tembiricha renji ye20 ~ 700 ℃, uye yakawana iyo stress-strain curve, goho simba, kusimba kwesimba, Yechidiki modulus, uye kureba. uye coefficient yekuwedzera.Zhang et al. 2, Hu nevamwe. 3, zvichingodaro, kuburikidza nekuongororwa kwemakemikari ekuumbwa, kuyedza midziyo yekuongorora, microstructure kuyedzwa, macroscopic uye microscopic kuongororwa kwetambo yepamusoro, uye mhedzisiro inoratidza kuti chikonzero chikuru chekutsemuka kwemabhaudhi akasimba ane chekuita nekuremara kweshinda, uye kuitika kwehurema hweshinda Huru hwekushushikana, kutsemuka tip kushushikana uye kuvhurika-mhepo kukonzeresa corrosion mamiriro ese.
High-simba mabhoti emabhiriji esimbi anowanzo shandiswa kwenguva yakareba munzvimbo ine hunyoro.Zvinhu zvakadai sekunyorova kwepamusoro, tembiricha yepamusoro, uye sedimentation uye kutorwa kwezvinhu zvinokuvadza munharaunda zvinogona kukonzera kuparara kwezvivako zvesimbi nyore nyore.Corrosion inogona kukonzera-yakasimba-simba bhoti yemuchinjikwa-chikamu kurasikirwa, zvichiita kuti pave nekuputsika uye kuenderera mberi kwekukanganisa uye kuenderera mberi. kuderedza hupenyu hwemabhoti ane simba guru uye kunyange kuita kuti iparadze.Kusvika ikozvino, kune zvidzidzo zvakawanda pamusoro pemigumisiro yezvakatipoteredza corrosion pamusoro pekushungurudzika kwekuita kwekuita kwezvinhu.Catar et al4 vakaongorora maitiro ekushungurudzika kwehutu hwema magnesium alloys ane zvinyorwa zvakasiyana-siyana zvealuminium mu acidic, alkaline uye neutral environments nekunonoka strain dhigirii rekuongorora dhigirii rekuongorora dhizaini ye electrort uye electrort straining testamp; maitiro eCu10Ni alloy mu 3.5% NaCl mhinduro muhupo hwehuwandu hwakasiyana hwe sulfide ions.Aghion et al.6 vakaongorora corrosion performance ye die-cast magnesium alloy MRI230D mu 3.5% NaCl mhinduro nekunyudza bvunzo, munyu spray test, potentiodynamic SS polarization kuongorora uye kushushikana kwemaitiro e-stress. 9Cr martensitic simbi ichishandisa SSRT uye zvechinyakare electrochemical test techniques, uye yakawana mhedzisiro ye chloride ions pa static corrosion behaviour ye martensitic steel at room temperature.Chen et al.8 vakaongorora mastress corrosion behaviour nekutsemuka kwe X70 simbi musimulated dhaka remugungwa rine SRB patembiricha yakasiyana-siyana yakashandiswa neSSRTT yetembiricha gumi neSSRT.9 strain rate pamvura yegungwa stress corrosion resistance ye 00Cr21Ni14Mn5Mo2N austenitic Stainless steel.Zvigumisiro zvinoratidza kuti kutonhora muhuwandu hwe35 ~ 65 ℃ hakuna chinhu chakakosha pakushungurudzika kwemaitiro ekuora kwesimbi isina tsvina.Lu et al. 10 yakaongorora kunonoka kuputsika kwemaitiro emhando dzakasiyana-siyana dzesimba remagiredhi nemutoro wakafa wakanonoka kuputsika bvunzo uye SSRT.Inokurudzirwa kuti simba rekusimba re20MnTiB simbi uye 35VB simbi yakakwirira-yakasimba mabhaudhi inofanira kudzorwa pa1040-1190MPa 1190MPa.Zvisinei, yakawanda shandisa mhinduro dzeC3. iyo inoparadza nzvimbo, nepo chaiyo yekushandisa mamiriro epamusoro-simba mabhoti yakanyanya kuoma uye ine zvakawanda zvinofurira zvinhu, zvakadai sepH kukosha kwebhoti.Ananya et al. 11 yakadzidza mhedzisiro yezvakatipoteredza parameters uye zvinhu mune inoora svikiro pane corrosion uye kusagadzikana ngura kuputika kwe duplex Stainless steels.Sunada et al. 12 yakaita kamuri tembiricha stress ngura cracking bvunzo paSUS304 simbi mune aqueous mhinduro dzine H2SO4 (0-5.5 kmol/m-3) uye NaCl (0-4.5 kmol/m-3) Migumisiro H2SO4 uye NaCl pamusoro ngura mhando SUS304 simbi yakadzidzwawo. CO2 / CO concentration, gasi rinomanikidza uye nguva yekuora pamatambudziko ekuora mwoyo kweA516 kumanikidza mudziyo wesimbi.Kushandisa NS4 mhinduro semvura yepasi simulating solution, Ibrahim et al. 14 yakaongorora mhedzisiro yezvakatipoteredza parameters senge bicarbonate ion (HCO) concentration, pH uye tembiricha pastress corrosion cracking yeAPI-X100 pipeline simbi mushure mekusvuura coating.Shan et al. 15 yakadzidza mutemo wekusiyana kwekushungurudzika kwegorosi kuparara kwekunzwa kwe austenitic stainless simbi 00Cr18Ni10 nekushisa pasi pemamiriro akasiyana-siyana ekushisa (30 ~ 250 ℃) pasi pemamiriro emvura yakasviba yepakati mune simulated marasha-ku-hydrogen chirimwa neSSRT. kunonoka kuputsika bvunzo uye SSRT.Zhao17 akadzidza mhedzisiro yepH, SO42-, Cl-1 pane stress corrosion maitiro eGH4080A alloy neSSRT.Zvigumisiro zvinoratidza kuti iyo yakaderera pH kukosha, iyo yakaipisisa kushushikana kwekudzikidzika kwekupokana kweGH4080A alloy.Iine zviri pachena kushushikana kune corrosion corrosion uye SO-sensitive. tembiricha yekamuri.Zvisinei, pane zvishoma zvidzidzo pamusoro pemhedzisiro yekuora kwezvakatipoteredza pa20MnTiB simbi yakakwirira-simba mabhoti.
Kuti uwane zvikonzero zvekukundikana kwemabhaudhi akasimba anoshandiswa mumabhiriji, munyori akaita zvidzidzo zvakatevedzana.Zviratidzo zvemabhoti epamusoro-soro zvakasarudzwa, uye zvikonzero zvekukundikana kwezvienzaniso izvi zvakakurukurwa kubva pamaonero ekugadzirwa kwemakemikari, kuputsika microscopic morphology, metallographic structure uye mechanical properties analysis19, 2phesmosed tsvakurudzo mumakore achangopfuura ekuongorora kweBangqing. chirongwa chekuora chinotevedzera mamiriro ekunze ane mwando ekuChongqing chakagadzirwa.Kuedza kuomarara kwekuora mwoyo, kuedza kwemagetsi emagetsi uye kuneta kwemagetsi emagetsi akasimba muChongqing akaitwa. Muchidzidzo ichi, kukonzeresa tembiricha, pH kukosha uye kusungirirana kwekuyedzerwa kwecorrosion mhinduro paStress lt-Tigang 20M. kuburikidza nemichina yezvivakwa bvunzo, kutsemuka macroscopic uye microscopic kuongororwa, uye pamusoro pecorrosion zvigadzirwa.
Chongqing iri kumaodzanyemba kwakadziva kumadokero kweChina, kumusoro kweRwizi rwaYangtze, uye ine humid subtropical monsoon climate.The gore negore avhareji tembiricha iri 16-18°C, avhareji yegore hunyoro hunyoro huzhinji huzhinji 70-80%, maawa ekupenya kwezuva kwepagore maawa 1000-1400, uye kupenya kwezuva-chikamu che35 chete%.
Zvinoenderana nemishumo ine chekuita nekupenya kwezuva uye ambient tembiricha muChongqing kubva 2015 kusvika 2018, avhareji tembiricha yemazuva ese muChongqing yakadzikira kusvika 17°C uye yakakwira kusvika 23°C. Tembiricha yepamusoro-soro pabhiriji reChaotianmen Bridge muChongqing inogona kusvika 50°C °C21,22. Naizvozvo, tembiricha yebvunzo yecorrosion test yakaiswa pa25°C uye 50°C.
Iyo pH kukosha kweiyo yakateedzerwa corrosion solution inotarisisa huwandu hweH +, asi hazvireve kuti iyo yakaderera pH kukosha, iyo iri nyore kuora kunoitika. Mhedzisiro yepH pane zvawanikwa ichasiyana kune akasiyana zvinhu uye mhinduro.Kuitira kuti udzidze zvirinani maitiro eakateedzerwa corrosion mhinduro pane kushushikana corrosion kuita kwe-high-simba mabhauti, iyo pH ye5 corrosion kuyedza. uye 7.5 pamwe chete netsvakurudzo yemabhuku23 uye pH yakasiyana-siyana yemvura inonaya yegore negore muChongqing.2010 kusvika 2018.
Iyo yakakwira iyo yekumisikidzwa kweiyo yakateedzeredzwa corrosion solution, iyo yakawanda ion yemukati mune yakateedzerwa corrosion solution, uye yakanyanya kupesvedzera pazvinhu zvenyama.Kuitira kudzidza mabatiro eiyo simulated corrosion solution yekumisikidza pane kushushikana kwecorrosion yemabhaudhi akasimba, iyo yekugadzira marabhoritari yakamhanyisa corrosion bvunzo yakagadziriswa, uye iyo yekumisikidza corrosion bvunzo yakagadziriswa, uye mhinduro yakateedzeredzwa yakagadziriswa. yepakutanga simulated corrosion solution concentration (1 ×), 20 × yepakutanga simulated corrosion solution concentration (20 ×) uye 200 × yepakutanga simulated corrosion solution concentration (200 ×).
Mamiriro ekunze ane tembiricha ye25 ℃, pH kukosha kwe5.5, uye kusungirirwa kweyekutanga yakateedzerwa corrosion solution ndiyo iri padyo nemamiriro chaiwo ekushandiswa kwepamusoro-simba mabhaudhi emabhiriji.Zvisinei, kuitira kuti ikurumidze kuyedza corrosion process, mamiriro ekuyedza ane tembiricha ye25 °C, pH ye5.5 × 20 corrosion yakaiswa seti yepakutanga seti pH ye5.5 × corro yepakutanga yakasetwa seta. boka rekutonga.Apo migumisiro yekushisa, kusungirirwa kana pH kukosha kweiyo yakafananidzirwa corrosion solution pamusoro pekushungurudzika kwekuita corrosion ye-high-simba mabhoti yakaongororwa maererano, zvimwe zvinhu zvakaramba zvisina kuchinjwa, izvo zvakashandiswa seyero yekuedza yeboka rekutonga rekutarisa.
Zvinoenderana ne2010-2018 atmospheric environment quality briefing yakabudiswa neChongqing Municipal Bureau of Ecology and Environment, uye tichitaura nezvezvikamu zvekunaya kwemvura zvakashumwa muZhang24 nemamwe mabhuku akataurwa muChongqing, yakatedzerwa corrosion solution yakavakirwa pakuwedzera kuwanda kweSO42- yakagadzirwa. iyo yakateedzerwa corrosion solution inoratidzwa muTafura 1:
Mushonga unofananidzwa wekuora unogadzirwa nekemikari ion concentration yekuenzanisa nzira uchishandisa analytical reagents uye mvura yakasvibiswa.Iyo pH kukosha kweiyo yakagadziriswa corrosion solution yakagadziridzwa neyakarurama pH mita, nitric acid solution uye sodium hydroxide solution.
Kuti utevedzere mamiriro ekunze ane hunyoro muChongqing, muyedzo wekupfapfaidza munyu wakanyatsogadziridzwa uye wakagadzirwa25.Sezvinoratidzwa mumufananidzo 1, midziyo yekuyedza ine masisitimu maviri: sisitimu yemunyu yekupfap Chikamu chinoumbwa nezvinhu zvekuyeresa tembiricha, izvo zvinonzwa tembiricha mukamuri yekuyedza. Chikamu chekutonga chinoumbwa nemicrocomputer, inobatanidza chikamu chekupfapfaidza uye chikamu cheiyo induction kudzora iyo yese yekuyedza maitiro. Iyo yekuvhenekesa system inoiswa mumunyu wekupfapfaidza test chamber kutevedzera chiedza chezuva. Iyo yekuvhenekesa mwenje ine infrared mwenje uye yenguva controller. Panguva imwecheteyo yekupfapfaidza tembiricha mutembiricha yakaiswa mutembiricha yemunyu panguva imwe chete yemunyu yakaiswa mutembiricha yemunyu. nguva chaiyo.
Stress corrosion samples pasi pemutoro wenguva dzose dzakagadziriswa maererano neNACE TM0177-2005 (Laboratory Testing yeSulfide Stress Cracking uye Stress Corrosion Cracking Resistance of Metals in a H2S Environment).Stress corrosion specimens yakatanga kucheneswa neacetone uye ultrasonic mechanical cleaning newaini yakaomeswa newaini yakaomeswa, uye oiri yakaomeswa newaini yakaomeswa, uye oiri yakaomeswa neohydrated inobvisa oiri. masampuli akachena mukamuri yekuyedza yemunyu wekupfapfaidza test mudziyo kutevedzera ngura mumamiriro ekunze anonyorovesa eChongqing. Maererano neyakajairwa NACETM0177-2005 uye munyu wekupfapfaidza test standard GB/T 10,125-2012, iyo inogara ichiremedza kusagadzikana ngura nguva yekuyedza muchidzidzo ichi inofananidzwa bvunzo dzakaitwa pachiyero 6 bvunzo dzakaitwa. pasi pemamiriro akasiyana ekuora paMTS-810 universal tensile test muchina, uye ma mechanic properties uye fracture corrosion morphology yakaongororwa.
Mufananidzo 1 unoratidza macro- uye micro-morphology ye-surface corrosion ye-high-simba bolt stress stress corrosion specimens pasi pemamiriro akasiyana-siyana ekuora.2 uye 3 maererano.
Macroscopic morphology of stress corrosion specimens of 20MnTiB high-simba bolts pasi pezvakasiyana zvakafananidzwa nemararamiro ekuora: (a) hapana kuora; (b) 1 nguva; (c) 20 ×; (d) 200 ×; (e) pH3.5; (f) pH 7.5; (g) 50°C.
Micromorphology yezvigadzirwa zvekuora zve 20MnTiB yakakwirira-simba mabhoti munzvimbo dzakasiyana-siyana dzakafananidzwa dzakasvibiswa (100 ×): (a) 1 nguva; (b) 20 ×; (c) 200 ×; (d) pH3.5; (e) pH7 .5; (f) 50°C.
Inogona kuonekwa kubva kumufananidzo 2a kuti pamusoro peiyo isina kusvibiswa yakakwirira-simba bhoti muenzaniso inoratidza yakajeka metallic luster pasina corrosion iri pachena.Zvisinei, pasi pemamiriro ekutanga akafananidzirwa corrosion solution (Fig. 2b) yakasvibiswa zvishoma, uye iyo yakafananidzirwa corrosion solution yakanga isina simba pamusoro pemuenzaniso. Zvinhu zvezvinhu zvine simba shoma.Zvisinei, pasi pemamiriro e20 × yepakutanga simulated corrosion solution concentration (Fig. 2c), pamusoro pepamusoro-simba bolt specimen yakave yakavharwa zvachose nehuwandu hwakawanda hwezvigadzirwa zve tan corrosion uye zvishoma zvebrown-red corrosion.product, hapana pachena metallic luster yakawanikwa, uye pakanga pane chidimbu chebrown-blate pedo nechikamu chiduku chebrown. pasi pemamiriro e200 × yepakutanga simulated corrosion solution concentration (Fig. 2d), pamusoro peiyo sampuli yakavharwa zvachose nebrown corrosion products, uye brown-black corrosion products inowanikwa mune dzimwe nzvimbo.
Sezvo pH yakaderera kusvika ku3.5 (Fig. 2e), zvigadzirwa zve-tan-colored corrosion zvaive zvakanyanya pamusoro pemasampuli, uye zvimwe zvezvigadzirwa zvekuora zvakange zvabviswa.
Mufananidzo 2g unoratidza kuti sezvo kutonhora kunowedzera kusvika ku50 ° C, zvinyorwa zvebrown-red corrosion zvigadzirwa pamusoro pemuenzaniso zvinoderera zvakanyanya, nepo zvigadzirwa zvebrown corrosion zvinopenya zvakavhara pamusoro pesample munzvimbo yakakura.Iyo corrosion product layer yakasununguka, uye zvimwe zvigadzirwa zvebrown-black zvinobviswa.
Sezvinoratidzwa muMufananidzo 3, pasi pemamiriro akasiyana-siyana ekuora, zvigadzirwa zvekuora zviri pamusoro pe20MnTiB yakakwirira-simba bhoti inoshungurudza corrosion specimens zviri pachena kuti yakaderedzwa, uye kukora kweiyo corrosion layer kunowedzera nekuwedzera kwehuwandu hwekufananidzwa kwekugadzirisa corrosion solution. muenzaniso unogona kugoverwa muzvikamu zviviri: chikamu chekunze chezvigadzirwa zvekuora zvakagoverwa zvakaenzana, asi nhamba huru yezviputi zvinoonekwa; mukati memukati isumbu rakasununguka rezvigadzirwa zvehutu.Pasi pemamiriro e20 × yepakutanga simulated corrosion solution concentration (Fig. 3b), iyo corrosion layer iri pamusoro pemuenzaniso inogona kugoverwa muzvikamu zvitatu: kunze kwekunze kunonyanya kuparadzirwa zvigadziridzo zvemasumbu, izvo zvakasununguka uye zvinodzivirira, uye hazvina basa rakanaka; Iyo yepakati yepakati ndeye yunifomu corrosion chigadzirwa layer, asi pane kuputika kuri pachena, uye iyo ion yekuora inogona kupfuura nepakati uye inobvisa substrate; mukati memukati ndeye dense corrosion product layer pasina kuputika kwakajeka, iyo ine simba rakanaka rekudzivirira pane substrate.Pasi pemamiriro e200 × yepakutanga simulated corrosion solution concentration (Fig. 3c), iyo corrosion layer pamusoro peiyo sampuli inogona kugoverwa muzvikamu zvitatu: iyo yekunze yakatsetseka ndeye yakaonda uye yunifomu yekugadzirwa kwechigadzirwa; chikamu chepakati chinonyanya kuita petal-shaped uye flake-shaped corrosion Iyo yemukati layer ndeye dense corrosion product layer isina akatsemuka uye maburi, ayo ane yakanaka kudzivirira pa substrate.
Inogona kuonekwa kubva kuFig. 3d kuti mumamiriro ekufananidzwa kwekuora kwepH 3.5, kune nhamba huru yezvigadzirwa zve flocculent kana tsono-yakafanana netsono pamusoro pe20MnTiB high-simba bolt specimen.Zvinofungidzirwa kuti izvi zvigadzirwa zvekuora zvinonyanya γ-FeOOH yakawanda ye-inter-FeO6 uye α-FeOH yakawanda ye α-FeO6 uye diki-FeO6 corrosion layer ine mitswe iri pachena.
Zvinogona kuonekwa kubva Fig. 3f kuti kana tembiricha yakawedzera kusvika 50 ° C, hapana pachena dense yemukati ngura layer yakawanikwa mune ngura layer chimiro, zvichiratidza kuti pakanga paine mikaha pakati pematanho ekuora pa50 ° C, izvo zvakaita kuti substrate isafukidzwe zvachose nezvigadzirwa zvekuora. Inopa dziviriro kubva pakuwedzera substrate corrosion maitiro.
Iwo emakanika mabhaudhi epamusoro-simba mabhaudhi pasi pekugara achiremerwa kushungurudza corrosion munzvimbo dzakasiyana dzinoparadza anoratidzwa muTafura 2:
Zvinogona kuonekwa kubva paTable 2 kuti ma mechanic properties e20MnTiB high-simba bolt specimens achiri kusangana nezvinodiwa zvakajairwa mushure mekuoma-kunyorova cycle yakamhanyisa corrosion test munzvimbo dzakasiyana dzakafananidzwa dzakaita ngura, asi pane kumwe kukuvadzwa kana kuchienzaniswa neasina kuora.sample 20 × kana 200 × kusungirirwa kwechigadziro chekuenzanisa, kurebesa kwemuenzaniso kwakaderera zvakanyanya. The mechanical properties yakafanana pazvikamu zve 20 × uye 200 × yepakutanga inofananidzwa nekugadzirisa corrosion solutions.Apo pH kukosha kweiyo yakagadziriswa corrosion solution yakadonha kusvika ku3.5, simba rekugadzirisa uye kureba kwemaitiro e50 ° inoderera zvakanyanya, kuderera kwe5 ° kunowedzera kusimba. kuderera zvakanyanya, uye nharaunda shrinkage rate iri padyo zvakanyanya neyakajairwa kukosha.
The fracture morphologies ye20MnTiB high-simba bolt stress corrosion specimens pasi pemamiriro akasiyana-siyana ekuora anoratidzwa muMufananidzo 4, iyo macro-morphology yekutsemuka, iyo fiber zone iri pakati pekutyoka, micro-morphological lip ye shear interface, uye pamusoro pemuenzaniso.
Macroscopic uye microscopic fracture morphologies ye20MnTiB yakakwirira-simba bolt mienzaniso munzvimbo dzakasiyana-siyana dzakafananidzwa dzakasvibiswa (500 ×): (a) hapana kuora; (b) 1 nguva; (c) 20 ×; (d) 200 ×; (e) pH3.5; (f) pH7.5; (g) 50°C.
Zvinogona kuonekwa kubva mumufananidzo 4 kuti kuputsika kwe20MnTiB yakakwirira-simba bolt stress corrosion specimen pasi pezvakasiyana-siyana zvakafananidzirwa corrosion environments zvinopa chimiro chekapu-cone fracture. Kuenzaniswa neiyo isina corrod specimen (Fig. 4a), iyo yepakati nzvimbo yefiber area cracking idiki. , iyo shear lip nzvimbo yakakura.Izvi zvinoratidza kuti mechanical properties yezvinyorwa zvakanyanya kukuvadzwa mushure mekuora.Nekuwedzera kwekufananidzirwa kwekugadzirisa corrosion solution, makomba ari munzvimbo yefiber iri pakati pekuputsika akawedzera, uye kuputika kwakajeka seams kwakaonekwa.Apo kuwedzera kwakawedzera kusvika ku20 nguva iyo yepakutanga simulated corrosion solution, iyo yakaonekwa pane corrosion corrosion solution, iyo yakabuda pachena. sampuli, uye pakanga pane zvakawanda zvezvigadzirwa zvekuora pamusoro.sample.
Inotaridzirwa kubva kuMufananidzo 3d kuti kune kuputika kwakajeka mumucheka wekuora pamusoro pemuenzaniso, iyo isina simba rakanaka rekudzivirira pamatrix. Muchidimbu chekugadzirisa corrosion solution yepH 3.5 (Mufananidzo 4e), nzvimbo yemuenzaniso yakasvibiswa zvakanyanya, uye nzvimbo yepakati yefiber zviri pachena kuti idiki. , Kune nhamba yakawanda yezvisina kukwana kubvarura seams pakati pe fiber area.Nekuwedzera kwepH kukosha kweiyo yakafananidzirwa corrosion solution, nzvimbo yekubvarura munzvimbo yefiber iri pakati pekuputsika inoderera, gomba rinoderera zvishoma nezvishoma, uye gomba rakadzika rinodererawo zvishoma nezvishoma.
Apo tembiricha yakawedzera kusvika 50 ° C (Fig. 4g), iyo shear lip nzvimbo yekuputsika kwemuenzaniso ndiyo yakakura, makomba ari pakati pefiber nzvimbo akawedzera zvakanyanya, uye gomba rakadzika zvakare rakawedzera, uye kuwirirana pakati peiyo shear lip edge uye sampuli yepamusoro yakawedzera. Zvigadzirwa zveCorrosion nemakomba zvakawedzera, izvo zvakasimbisa kudzika maitiro e substrate corrosion inoratidzwa muFig. 3f.
Iyo pH kukosha kweiyo corrosion solution ichakonzera kumwe kukuvadza kune mechanical properties ye20MnTiB high-simba mabhoti, asi mhedzisiro yacho haina kukosha.Mumushonga wekuora wepH 3.5, nhamba huru yezvigadzirwa zve flocculent kana tsono-yakafanana ne-corrosion inoparadzirwa pamusoro pemuenzaniso, uye iyo corrosion, iyo iyo corrosion yekudzivirira ine ganda rakajeka rinoita ganda rakajeka. makomba ekuora uye nhamba yakawanda yezvigadzirwa zvehutu mu microscopic morphology yemuenzaniso fracture.Izvi zvinoratidza kuti kukwanisa kwemuenzaniso kupikisa deformation nekunze kwesimba kunonyanya kuderedzwa munzvimbo ine acidic, uye dhigirii yekushungurudzika kwemaitiro ekuora kwezvinhu kunowedzera zvakanyanya.
Mhedzisiro yepakutanga yakafananidzwa necorrosion yakange iine zvishoma pamichina yemagetsi e-high-simba mabhoti samples, asi sezvo kusungirirwa kweiyo yakafananidzirwa corrosion solution yakawedzera kusvika ku20 nguva yepakutanga yakafananidzwa nekugadzirisa corrosion solution, maitiro emagetsi emasampuli akakuvadzwa zvakanyanya, uye paiva nekuora kwakajeka mu microstructure yakaputsika. makomba, kuputika kwechipiri uye yakawanda yezvigadzirwa zvekuora.Apo iyo yakatemerwa corrosion solution concentration yakawedzera kubva ku20 times kusvika ku200 times of the original simulated corrosion solution concentration, mhedzisiro ye corrosion solution concentration pa mechanical properties of the material was weak.
Kana tembiricha yecorrosion inofananidzwa iri 25 ℃, simba regoho uye kusimba kwe20MnTiB yakakwirira-simba mabhaudhi zvienzaniso hazvisanduke zvakanyanya kana zvichienzaniswa nemhando dzisina kukoromoka.Zvisinei, pasi peiyo yakatemerwa ngura tembiricha ye50 °C, kusimba kwesimba nekurebesa kwechikamu chechikamu chakaderera zvakanyanya, kukosha kwechikamu kwakaderera zvakanyanya. muromo ndiwo waiva mukuru, uye paiva nemadimples ari nechepakati faibha area.Ichinyanya kuwedzera, gomba kudzika kwakawedzera, ngura zvigadzirwa uye ngura makomba kuwedzera.Izvi zvinoratidza kuti tembiricha synergistic ngura nharaunda ane simba guru pamusoro mechanical ehupfumi pamusoro-simba mabhaudhi, izvo zvisiri pachena pakamuri tembiricha, asi zvinonyanya kukosha kana tembiricha C inosvika 50 ° C.
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