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Chitsulo cha 20MnTiB ndichomwe chimagwiritsidwa ntchito kwambiri popangira milatho yachitsulo m'dziko langa, ndipo magwiridwe ake ndi ofunika kwambiri pakuyendetsa bwino kwa milatho. Potengera kafukufuku wa chilengedwe cha mumlengalenga ku Chongqing, kafukufukuyu adapanga njira yowononga dzimbiri yofananira ndi nyengo yachinyontho ya Chongqing, ndikuyesa kupsinjika kwa nyengo yanyengo yachisanu. Chongqing: Zotsatira za kutentha, mtengo wa pH ndi njira ya corrosion yotsatiridwa pa khalidwe la corrosion corrosion ya 20MnTiB ma bawuti amphamvu kwambiri anaphunziridwa.
Chitsulo cha 20MnTiB ndizomwe zimagwiritsidwa ntchito kwambiri pazitsulo zolimba kwambiri zopangira milatho yazitsulo m'dziko langa, ndipo ntchito yake ndi yofunika kwambiri pakugwira ntchito bwino kwa milatho.Li et al. 1 idayesa zitsulo za 20MnTiB zomwe zimagwiritsidwa ntchito kwambiri m'kalasi ya 10.9 zolimba kwambiri pamlingo wotentha kwambiri wa 20 ~ 700 ℃, ndipo zidapeza mapindikidwe a kupsinjika, mphamvu zokolola, kulimba kwamphamvu, modulus ya Young, ndi kutalika. ndi coefficient yowonjezera.Zhang et al. 2, Hu ndi al. 3, ndi zina, kudzera mu kuyezetsa kapangidwe ka mankhwala, makina kuyezetsa katundu, kuyezetsa microstructure, kusanthula macroscopic ndi ting'onoting'ono ulusi pamwamba, ndi zotsatira zimasonyeza kuti chifukwa chachikulu cha kuthyoka kwa mabawuti mkulu-mphamvu ndi zokhudzana ndi ulusi vuto, ndi kuchitika kwa ulusi kupunduka Kupanikizika kwakukulu, kupanikizika kwa nsonga ya mng'alu ndi kuphulika kwa mpweya kumayambitsa kupsinjika maganizo.
Maboti amphamvu kwambiri a milatho yachitsulo nthawi zambiri amagwiritsidwa ntchito kwa nthawi yayitali m'malo achinyezi. Zinthu monga chinyezi chambiri, kutentha kwambiri, komanso kuyamwa kwa zinthu zovulaza m'chilengedwe zimatha kuyambitsa dzimbiri zazitsulo.Kuwonongeka kungayambitse kutayika kwamphamvu kwambiri kwa bawuti, zomwe zimapangitsa kuti pakhale ming'alu ndi ming'alu yambiri. kuchepetsa moyo wa ma bolts amphamvu kwambiri komanso ngakhale kuwapangitsa kusweka.Pakadali pano, pali maphunziro ambiri okhudza momwe kuwonongeka kwa chilengedwe kumapangitsa kuti zinthu ziwonongeke.Catar et al4 anafufuza khalidwe la kupsinjika kwa corrosion ya ma magnesium alloys okhala ndi aluminiyumu yosiyana mu malo acidic, alkaline ndi osalowerera ndale ndi pang'onopang'ono kupsyinjika kwa testellectrot electrot . khalidwe la Cu10Ni alloy mu 3.5% NaCl solution pamaso pa mitundu yosiyanasiyana ya sulfide ions.Aghion et al.6 adawunika ntchito ya corrosion ya die-cast magnesium alloy MRI230D mu 3.5% NaCl yankho mwa kumiza, kuyesa mchere wa mchere, kusanthula kwa potentiodynamic SS polarization ndi kusokoneza maganizo kwa MRI230D. Chitsulo cha 9Cr martensitic chogwiritsa ntchito SSRT ndi njira zoyesera zama electrochemical, ndikupeza mphamvu ya ayoni a chloride pamayendedwe okhazikika a chitsulo cha martensitic pa kutentha kwa chipinda.Chen et al.8 adafufuza za kupsinjika kwa dzimbiri komanso kusweka kwa chitsulo cha X70 munjira yoyeserera yamatope a m'nyanja yomwe ili ndi SRB pa kutentha kosiyana kogwiritsidwa ntchito ndi SSRTT ndi phunziro la SSRT9. kupsyinjika pamadzi a m'nyanja kupsinjika kwa dzimbiri kukana kwa 00Cr21Ni14Mn5Mo2N austenitic zitsulo zosapanga dzimbiri.Zotsatirazi zikuwonetsa kuti kutentha kwa 35 ~ 65 ℃ sikukhudza kwambiri kupsinjika kwa dzimbiri kwa chitsulo chosapanga dzimbiri.Lu et al. 10 idawunika kuchedwa kwa kuthyoka kwa zitsanzo zokhala ndi mphamvu zosiyanasiyana zolimba ndi katundu wakufa wochedwa kuthyoka mayeso ndi SSRT. Akuti kulimba kwamphamvu kwa 20MnTiB chitsulo ndi 35VB zitsulo zolimba kwambiri ziyenera kuwongoleredwa pa 1040-1190MPa imodzi mwazosavuta. malo owononga, pamene malo enieni ogwiritsira ntchito ma bolts amphamvu kwambiri ndi ovuta kwambiri ndipo ali ndi zinthu zambiri zokopa, monga pH mtengo wa bolt.Ananya et al. 11 idaphunzira momwe zinthu zachilengedwe zimakhudzira magawo ndi zida zomwe zili m'malo owononga pa dzimbiri komanso kupsinjika kwa corrosion kusweka kwa duplex zitsulo zosapanga dzimbiri.Sunada et al. 12 inachititsa mayesero a kutentha kwa chipinda cha kutentha kwa kutentha kwa chitsulo cha SUS304 muzitsulo zamadzimadzi zomwe zili ndi H2SO4 (0-5.5 kmol/m-3) ndi NaCl (0-4.5 kmol/m-3) . CO2 / CO ndende, kuthamanga kwa gasi ndi nthawi ya dzimbiri pa kupsinjika kwa dzimbiri kwa A516 kukakamiza chotengera chitsulo.Kugwiritsa ntchito njira ya NS4 ngati njira yothetsera madzi apansi panthaka, Ibrahim et al. 14 idafufuza momwe zinthu zachilengedwe zimayendera monga ndende ya bicarbonate ion (HCO), pH ndi kutentha pakuphwanyidwa kwapaipi kwapaipi ya API-X100 pambuyo pochotsa zokutira.Shan et al. 15 anaphunzira kusiyanasiyana lamulo la nkhawa dzimbiri akulimbana chiwopsezo cha austenitic zosapanga dzimbiri chitsulo 00Cr18Ni10 ndi kutentha pansi osiyana kutentha mikhalidwe (30 ~ 250 ℃) pansi pa chikhalidwe cha wakuda madzi sing'anga mu yoyerekeza malasha-to-hydrogen chomera ndi SSRT. kuchedwa kuthyoka kuyesa ndi SSRT.Zhao17 anaphunzira zotsatira za pH, SO42-, Cl-1 pa khalidwe corrosion maganizo a GH4080A aloyi ndi SSRT. kutentha kwa chipinda.Komabe, pali maphunziro ochepa pa zotsatira za kuwonongeka kwa chilengedwe pazitsulo zazitsulo za 20MnTiB zamphamvu kwambiri.
Pofuna kupeza zifukwa kulephera mkulu-mphamvu mabawuti ntchito milatho, wolemba wachita angapo studies.High-mphamvu bawuti zitsanzo anasankhidwa, ndi zifukwa za kulephera zitsanzo zimenezi zinakambidwa pa maganizo a mankhwala zikuchokera, fracture microscopic morphology, kapangidwe metallographic ndi makina katundu kusanthula mu zaka zaposachedwapa Chongqing pa kafukufuku wa zaka 20, pa kafukufuku waposachedwapa wa Chongqing. Kuyesa kwa dzimbiri kupsinjika, kuyesa kwa dzimbiri kwa electrochemical komanso kutopa kwa ma bolt amphamvu kwambiri ku Chongqing motengera nyengo yachinyontho kunachitika. kudzera pakuyezetsa katundu wamakina, kusanthula kwa ma macroscopic ndi tinthu tating'onoting'ono, ndi zinthu zowonongeka pamwamba.
Chongqing ili kum'mwera chakumadzulo kwa China, kumtunda kwa Mtsinje wa Yangtze, ndipo kumakhala ndi nyengo yotentha yamvula yamkuntho.The pafupifupi kutentha kwapachaka ndi 16-18 ° C, chinyezi chapakati pachaka chimakhala 70-80%, maola a dzuwa pachaka ndi maola 1000-1400, ndipo dzuwa-25 peresenti ndi 35% yokha.
Malinga ndi malipoti okhudzana ndi kuwala kwa dzuwa komanso kutentha kwapakati ku Chongqing kuyambira 2015 mpaka 2018, kutentha kwa tsiku ndi tsiku ku Chongqing kumakhala kotsika mpaka 17°C komanso mpaka 23°C. Kutentha kwapamwamba kwambiri pa mlatho wa Chaotianmen Bridge ku Chongqing kumatha kufika 50 ° C ° C21,22. Chifukwa chake, kutentha kwa kuyesa kuwononga kupsinjika kunayikidwa pa 25 ° C ndi 50 ° C.
Phindu la pH la njira yoyezera dzimbiri limatsimikizira kuchuluka kwa H +, koma sizitanthauza kuti kutsika kwa pH, kupendekera kosavuta kumachitika. Zotsatira za pH pazotsatira zimasiyana pazida zosiyanasiyana ndi mayankho. ndi 7.5 kuphatikiza kafukufuku wa mabuku23 ndi pH ya madzi amvula pachaka ku Chongqing.2010 mpaka 2018.
Kuchuluka kwa njira yoyezera dzimbiri, momwe ma ion amachulukira munjira yoyezera dzimbiri, komanso kukhudzidwa kwakukulu kwazinthu zakuthupi. Kuti muphunzire momwe njira yoyeserera ya dzimbiri imakhudzira kupsinjika kwa ma bolts amphamvu kwambiri, ma labotale ochita kupanga adafulumizitsa kuyesa kwa dzimbiri, ndipo njira yofananira ya dzimbiri idakhazikitsidwa, ndipo njira yofananira ya corrosion idakhazikitsidwa. choyambirira choyerekeza dzimbiri njira ndende (1 ×), 20 × choyambirira yoyerekeza dzimbiri njira ndende (20 ×) ndi 200 × choyambirira yoyerekeza dzimbiri njira ndende (200 ×).
Chilengedwe ndi kutentha kwa 25 ℃, pH mtengo wa 5.5, ndi ndende ya njira yapachiyambi ya dzimbiri ndiyo yomwe ili pafupi kwambiri ndi momwe ma bolts amphamvu kwambiri amagwiritsira ntchito milatho. gulu lolamulira.Pamene zotsatira za kutentha, ndende kapena pH mtengo wa njira yowonongeka yowonongeka pa kupsinjika kwa corrosion ntchito yazitsulo zolimba kwambiri zinkafufuzidwa motsatira, zinthu zina sizinasinthe, zomwe zinagwiritsidwa ntchito ngati mlingo woyesera wa gulu lolamulira.
Malinga ndi chidziwitso cha chikhalidwe cha chilengedwe cha 2010-2018 chomwe chinaperekedwa ndi Chongqing Municipal Bureau of Ecology and Environment, komanso ponena za zigawo za mvula zomwe zafotokozedwa ku Zhang24 ndi zolemba zina zomwe zalembedwa ku Chongqing, njira yofanana ndi ya dzimbiri yotengera kuchuluka kwa SO42- idapangidwa. njira yoyeserera ya dzimbiri ikuwonetsedwa patebulo 1:
Njira yoyeserera ya dzimbiri imakonzedwa ndi njira ya ma ion concentration ya ma chemicals pogwiritsa ntchito ma analytical reagents ndi madzi osungunula. Phindu la pH la njira ya dzimbiri yoyeserera linasinthidwa ndi pH mita yolondola, nitric acid solution ndi sodium hydroxide solution.
Pofuna kutengera nyengo yachinyontho ku Chongqing, woyezera kupopera mchere wasinthidwa mwapadera ndikupangidwa 25. Monga momwe tawonetsera pa Chithunzi 1, zida zoyesera zili ndi machitidwe awiri: makina opopera mchere ndi magetsi. Gawoli limapangidwa ndi zinthu zoyezera kutentha, zomwe zimazindikira kutentha mu chipinda choyesera. Gawo loyang'anira limapangidwa ndi microcomputer, yomwe imagwirizanitsa gawo la kupopera ndi gawo lothandizira kuti lilamulire ndondomeko yonse yoyesera. Njira yowunikira imayikidwa mu chipinda choyesera cha mchere kuti chiyese kuwala kwa dzuwa. pompopompo.
Kupsyinjika dzimbiri zitsanzo pansi nthawi zonse katundu anali kukonzedwa mogwirizana ndi NACETM0177-2005 (Laboratory Mayeso a Sulfide Stress Cracking and Stress Corrosion Cracking Resistance of Metals mu H2S Environment).Kupsyinjika dzimbiri zitsanzo poyamba kutsukidwa ndi acetone ndi akupanga makina kuyeretsa ndi akupanga makina kuyeretsa ndi kuyika zouma zoledzeretsa oledzeretsa ndi mafuta. Zitsanzo zoyera mu chipinda choyesera cha chipangizo choyezera kutsitsi kuti chiyesere momwe chiwonongeko chikuchitika m'nyengo yachinyontho ya Chongqing. Malinga ndi muyezo wa NACETM0177-2005 ndi mayeso opopera mchere a GB/T 10,125-2012, nthawi zonse zolemetsa zowononga dzimbiri nthawi yoyesera mu phunziroli ndizomwe zimayesedwa mofanana pa 168 test corrosion. pansi pazikhalidwe zosiyanasiyana za dzimbiri pa makina a MTS-810 oyezetsa osasunthika padziko lonse lapansi, ndi mawonekedwe awo amakina ndi mawonekedwe a fracture corrosion morphology adawunikidwa.
Chithunzi 1 chikuwonetsa macro- ndi micro-morphology ya pamwamba pa corrosion of high-strong bolt stress stress corrosion specimens pansi pa zikhalidwe zosiyanasiyana zowonongeka.2 ndi 3 motsatira.
Macroscopic morphology of stress corrosion specimens of 20MnTiB high-power bolts pansi pa malo osiyana siyana opangidwa ndi dzimbiri: (a) palibe dzimbiri; (b) 1 nthawi; (c) 20 ×; (d) 200 ×; (e) pH3.5; (f) pH 7.5; (g) 50°C.
Micromorphology of corrosion products of 20MnTiB high-strong bolts in different corrosion environments (100×): (a) 1 nthawi; (b) 20 ×; (c) 200 ×; (d) pH3.5; (e) pH7 .5; (f) 50°C.
Tingaone kuchokera mkuyu. 2a kuti pamwamba pa uncorroded mkulu-mphamvu bawuti chitsanzo amasonyeza kuwala zitsulo luster popanda dzimbiri zoonekeratu. zinawonongeka pang'ono, ndipo njira yowonongeka yowonongeka inalibe mphamvu pamtunda wa chitsanzo. Zida zakuthupi zimakhala ndi zotsatira zochepa. pansi pa chikhalidwe cha 200 × choyambirira yoyerekeza dzimbiri njira ndende (mkuyu. 2d), pamwamba chitsanzo yokutidwa ndi zinthu zofiirira dzimbiri, ndi bulauni-wakuda dzimbiri mankhwala kuonekera m'madera ena.
Pamene pH inatsikira ku 3.5 (mkuyu 2e), zinthu zowonongeka zamtundu wa tani zinali zambiri pamwamba pa zitsanzo, ndipo zina mwazinthu zowonongeka zinali zowonongeka.
Chithunzi 2g chimasonyeza kuti pamene kutentha kumawonjezeka kufika ku 50 ° C, zomwe zimakhala zofiira zofiira pamwamba pa sampuli zimachepa kwambiri, pamene zinthu zowonongeka za bulauni zimaphimba pamwamba pa chitsanzo m'dera lalikulu.
Monga momwe tawonetsera pa Chithunzi 3, pansi pazigawo zosiyanasiyana za dzimbiri, zinthu zowonongeka zomwe zili pamwamba pa 20MnTiB zolimbitsa mphamvu zowonongeka zowonongeka zimakhala zowonongeka, ndipo makulidwe a corrosion amawonjezeka ndi kuwonjezeka kwa njira yowonongeka. chitsanzocho chikhoza kugawidwa m'magulu awiri: gawo lakunja la zinthu zowonongeka zimagawidwa mofanana, koma ming'alu yambiri ikuwonekera; wosanjikiza wamkati ndi gulu lotayirira la dzimbiri mankhwala.Mu chikhalidwe cha 20 × choyambirira yoyerekeza dzimbiri njira ndende (mkuyu. 3b), ndi dzimbiri wosanjikiza pamwamba pa chitsanzo akhoza kugawidwa mu zigawo zitatu: wosanjikiza akunja makamaka omwazika masango dzimbiri mankhwala, amene ali lotayirira ndi porous, ndipo alibe ntchito zabwino; Chigawo chapakati ndi yunifolomu yowonongeka kwa mankhwala, koma pali ming'alu yoonekeratu, ndipo ma ions owononga amatha kudutsa ming'alu ndikuwononga gawo lapansi; wosanjikiza wamkati ndi wandiweyani dzimbiri mankhwala wosanjikiza popanda ming'alu zoonekeratu, amene ali ndi zabwino zoteteza kwenikweni pa gawo lapansi. wosanjikiza wapakati makamaka petal woboola pakati ndi flake woboola pakati dzimbiri Mkati wosanjikiza ndi wandiweyani dzimbiri mankhwala wosanjikiza popanda ming'alu zoonekeratu ndi mabowo, amene ali ndi chitetezo chabwino pa gawo lapansi.
Zitha kuwoneka kuchokera ku Mkuyu 3d kuti mumlengalenga wonyezimira wa pH 3.5, pali zinthu zambiri zowonongeka kapena zowonongeka ngati singano pamtunda wa 20MnTiB mkulu-mphamvu balt chitsanzo. dzimbiri wosanjikiza ali ndi ming'alu zoonekeratu.
Zitha kuwoneka kuchokera mkuyu 3f kuti pamene kutentha kunawonjezeka kufika 50 ° C, palibe zoonekeratu wandiweyani mkati dzimbiri wosanjikiza anapezeka dzimbiri wosanjikiza dongosolo, kusonyeza kuti panali mipata pakati pa dzimbiri zigawo pa 50 °C, amene anapanga gawo lapansi osati kwathunthu yokutidwa ndi dzimbiri mankhwala. Amapereka chitetezo ku chizolowezi chowonjezereka cha gawo lapansi.
Kapangidwe ka ma bawuti amphamvu kwambiri pansi pa dzimbiri zolemetsa zolemetsa m'malo owononga osiyanasiyana akuwonetsedwa mu Gulu 2:
Zitha kuwonedwa kuchokera ku Table 2 kuti mawonekedwe a makina a 20MnTiB olimba kwambiri a bawuti akadali amakwaniritsa zofunikira pambuyo pa kuuma konyowa kufulumizitsa kuyesedwa kwa dzimbiri m'malo osiyanasiyana ochita dzimbiri, koma pali kuwonongeka kwina poyerekeza ndi zosawonongeka.sample. 20 × kapena 200 × ndende ya njira yofananira, elongation ya chitsanzo inachepa kwambiri. The makina katundu ndi ofanana pa ndende ya 20 × ndi 200 × original zoyeserera dzimbiri njira.Pamene pH mtengo wa njira zoyezera dzimbiri anatsikira ku 3.5, kumakanika mphamvu ndi elongation wa zitsanzo 50 ° kutentha kwambiri, pamene 50 ° kutentha kwambiri kutsika ndi kukwera kwa mphamvu. kuchepa kwambiri, ndipo kuchuluka kwa shrinkage kwadera kuli pafupi kwambiri ndi mtengo wokhazikika.
Ma fracture morphologies a 20MnTiB high-strong balt bolt stress corrosion specimens pansi pazigawo zosiyanasiyana za dzimbiri akuwonetsedwa mu Chithunzi 4, chomwe ndi macro-morphology ya fracture, zone ya fiber pakati pa fracture, milomo ya micro-morphological ya mawonekedwe a shear, ndi pamwamba pa chitsanzo.
Ma microscopic ndi ma microscopic fracture morphologies a 20MnTiB amphamvu kwambiri a bawuti zitsanzo m'malo osiyanasiyana ochita dzimbiri (500 ×): (a) palibe dzimbiri; (b) 1 nthawi; (c) 20 ×; (d) 200 ×; (e) pH3.5; (f) pH7.5; (g) 50°C.
Zitha kuwoneka kuchokera mkuyu 4 kuti kupasuka kwa 20MnTiB yamphamvu kwambiri ya bolt stress corrosion specimen pansi pamitundu yosiyanasiyana ya dzimbiri kumapereka kusweka kwa kapu. Poyerekeza ndi chitsanzo chosawonongeka (mkuyu 4a), dera lapakati la chigawo cha fiber ndi chochepa. , dera la milomo ya shear ndilokulirapo.Izi zikuwonetsa kuti makina a zinthuzo amawonongeka kwambiri pambuyo pa corrosion.Ndi kuwonjezereka kwa njira zowonongeka zowonongeka, maenje amtundu wa fiber pakati pa fracture anawonjezeka, ndipo misozi yowoneka bwino imawonekera. chitsanzo, ndipo panali zambiri za dzimbiri pamwamba.chitsanzo.
Zimatengedwa kuchokera ku Chithunzi 3d kuti pali ming'alu yoonekera pazitsulo zowonongeka pamwamba pa chitsanzo, zomwe zilibe chitetezo chabwino pa matrix. Mu njira ya dzimbiri yoyerekeza ya pH 3.5 (Chithunzi 4e), pamwamba pa chitsanzocho chawonongeka kwambiri, ndipo dera lapakati la fiber ndilochepa. , Pali mitundu yambiri ya misozi yosawerengeka pakati pa fiber area.Ndi kuwonjezeka kwa pH mtengo wa njira yowonongeka yowonongeka, misozi ya misozi m'dera la fiber pakati pa fracture imachepa, dzenje limachepa pang'onopang'ono, ndipo kuya kwa dzenje kumachepanso pang'onopang'ono.
Pamene kutentha chinawonjezeka kufika 50 ° C (mkuyu. 4g), kukameta ubweya milomo m'dera la kuthyoka chitsanzo anali yaikulu, maenje m'dera chapakati CHIKWANGWANI chinawonjezeka kwambiri, ndi dzenje kuya komanso kuchuluka, ndi mawonekedwe pakati kukameta ubweya mlomo m'mphepete ndi pamwamba chitsanzo chinawonjezeka. Zopangira dzimbiri ndi maenje zidawonjezeka, zomwe zidatsimikizira kuzama kwa dzimbiri la gawo lapansi lomwe likuwonetsedwa mu Chithunzi 3f.
Phindu la pH la njira yowonongeka idzawononga zina zowonongeka kwa makina a 20MnTiB ma bolts amphamvu kwambiri, koma zotsatira zake sizofunika kwambiri. Mu njira yowonongeka ya pH 3.5, chiwerengero chachikulu cha zinthu zowonongeka kapena zowonongeka ngati singano zimagawidwa pamwamba pa chitsanzo, ndipo zowonongeka, zomwe zosanjikiza sizingakhale zoonekeratu. maenje a dzimbiri ndi zinthu zambiri zowonongeka mu microscopic morphology ya chitsanzo cha fracture.Izi zikuwonetsa kuti kuthekera kwa chitsanzo kukana mapindikidwe ndi mphamvu yakunja kumachepetsedwa kwambiri m'malo a acidic, ndipo mlingo wa kupsinjika kwa dzimbiri chizolowezi chakuthupi chikuwonjezeka kwambiri.
The choyambirira yoyerekeza dzimbiri njira anali ndi zotsatira zochepa pa katundu mawotchi a zitsanzo mkulu-mphamvu bawuti, koma ndende ya yoyeseza dzimbiri njira kuchuluka kwa 20 nthawi ya choyambirira yoyerekeza dzimbiri njira, ndi katundu makina a zitsanzo anali kwambiri kuonongeka, ndipo panali dzimbiri zoonekeratu mu fracture microstructure. maenje, yachiwiri ming'alu ndi zambiri dzimbiri mankhwala.Pamene yoyerekeza dzimbiri njira ndende chinawonjezeka kuchokera 20 zina 200 nthawi yoyambirira yoyerekeza dzimbiri njira ndende, zotsatira za dzimbiri njira ndende pa mawotchi zimatha nkhaniyo anafooka.
Pamene kutentha kwa dzimbiri koyerekeza ndi 25 ℃, mphamvu zokolola ndi mphamvu zamakokedwe za 20MnTiB zolimba za bawuti zamphamvu sizimasintha kwambiri poyerekeza ndi zitsanzo zosawonongeka. Mlomo unali waukulu kwambiri, ndipo panali ma dimples m'chigawo chapakati cha CHIKWANGWANI.Chochititsa chidwi kwambiri, kukula kwa dzenje kukuwonjezeka, zinthu zowonongeka ndi maenje owononga zinawonjezeka.Izi zikusonyeza kuti kutentha kwa synergistic corrosion chilengedwe kuli ndi chikoka chachikulu pamakina azitsulo zamphamvu kwambiri, zomwe sizikuwonekera kutentha kwa chipinda, koma chofunika kwambiri pamene kutentha kumafika 50 ° C.
Pambuyo pakuyesa kwamphamvu kwa dzimbiri m'nyumba kufananiza chilengedwe cha mumlengalenga ku Chongqing, mphamvu zamakokedwe, mphamvu zokolola, elongation ndi magawo ena a 20MnTiB ma bawuti amphamvu kwambiri adachepetsedwa, ndipo kuwonongeka kwapang'onopang'ono kunachitika. maenje, ndikosavuta kupangitsa kuwonongeka kwa pulasitiki ku ma bolts amphamvu kwambiri, kuchepetsa kuthekera kokana mapindikidwe ndi mphamvu zakunja, ndikuwonjezera chizolowezi cha dzimbiri la nkhawa.
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