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20MnTiB karfe shine mafi yawan amfani da kayan aiki mai ƙarfi mai ƙarfi don gadoji na ƙarfe a cikin ƙasata, kuma aikin sa yana da mahimmanci ga amintaccen aikin gadoji.Bisa binciken yanayin yanayi a Chongqing, wannan binciken ya tsara wani maganin lalata wanda ke kwaikwayon yanayin ɗanshi na Chongqing, kuma ya aiwatar da tasirin tasirin yanayi na Chongqing. na zafin jiki, pH darajar da kwaikwaya bayani maida hankali a kan danniya lalata hali na 20MnTiB high-ƙarfi bolts an yi nazari.
20MnTiB karfe shine mafi yawan amfani da kayan aiki mai ƙarfi don gadoji na tsarin karfe a cikin ƙasata, kuma aikin sa yana da mahimmanci ga amintaccen aiki na gadoji.Li et al.1 ya gwada kaddarorin 20MnTiB karfe da aka saba amfani dashi a cikin sa 10.9 mai ƙarfi mai ƙarfi a cikin kewayon zafin jiki na 20 ~ 700 ℃, kuma ya sami madaidaicin yanayin damuwa, ƙarfin yawan amfanin ƙasa, ƙarfin ƙarfi, ƙarfin matashi, da elongation.da haɓaka haɓakawa.Zhang et al.2, Hu et al.3, da dai sauransu, ta hanyar gwajin abun da ke tattare da sinadarai, gwajin kadarorin inji, gwajin microstructure, nazarin macroscopic da microscopic na farfajiyar zaren, kuma sakamakon ya nuna cewa babban dalilin karaya na ƙugiya mai ƙarfi yana da alaƙa da lahani na zaren, da kuma abin da ya faru na lahani na zaren Babban matsalolin damuwa, fashewar tip damuwa taro da yanayin lalatawar iska duk haifar da damuwa.
Ƙarfin ƙarfi don gadoji na ƙarfe yawanci ana amfani da su na dogon lokaci a cikin yanayi mai laushi. Abubuwa irin su zafi mai zafi, zafi mai zafi, da kuma lalatawa da shayar da abubuwa masu cutarwa a cikin yanayi na iya haifar da lalacewa na tsarin karfe. su zuwa karya.Ya zuwa yanzu, akwai da yawa karatu a kan sakamakon da muhalli lalata a kan danniya lalata aikin kayan.Catar et al4 bincikar danniya lalata hali na magnesium gami da daban-daban aluminum abun ciki a cikin acidic, alkaline da tsaka tsaki yanayi ta jinkirin matsa lamba gwajin (SSRT) .Abdel et al.5 nazarin electrochemical da danniya lalata cracking hali na Cu10.5. et al.6 kimanta da lalata yi na mutu-cast magnesium gami MRI230D a cikin 3.5% NaCl bayani ta nutsewa gwajin, gishiri fesa gwajin, potentiodynamic polarization bincike da SSRT.Zhang et al.7 nazarin danniya lalata hali na 9Cr martensitic karfe ta yin amfani da SSRT da na gargajiya electrochemical gwajin dabaru, da kuma samu da sakamako na electrochemical dakin gwaje-gwaje da statuations a kan statins na electrochemical dakin gwaje-gwaje. et al.8 bincikar yanayin lalatawar damuwa da tsarin fashewa na X70 karfe a cikin simulated teku laka bayani dauke da SRB a yanayin zafi daban-daban ta SSRT.Liu et al.9 amfani da SSRT don nazarin tasirin zafin jiki da kuma rashin ƙarfi na rashin ƙarfi akan juriya na lalata ruwa na ruwa na 00Cr21Ni14Mn5Mo2N austenitic sakamako a kan bakin karfe 5. damuwa lalata hali na bakin karfe.Lu et al.10 kimanta da jinkirta karaya mai saukin kamuwa da samfurori da daban-daban tensile ƙarfi maki da wani matattu load jinkirta karaya gwajin da SSRT.It aka bayar da shawarar cewa tensile ƙarfi na 20MnTiB karfe da 35VB karfe high-ƙarfi kusoshi ya kamata a sarrafa a 1040-1190MPa.However, mafi yawan amfani da wadannan m nazarin halittu na Na'ura. yayin da ainihin yanayin amfani da ƙuƙuka masu ƙarfi ya fi rikitarwa kuma yana da abubuwa masu tasiri masu yawa, irin su darajar pH na bolt.Ananya et al.11 yayi nazarin tasirin sigogi na muhalli da kayan aiki a cikin tsaka-tsaki mai lalata akan lalata da damuwa lalata fatattaka na duplex bakin karfe.Sunada et al.12 gudanar dakin zafin jiki danniya lalata fasa gwaje-gwaje a kan SUS304 karfe a cikin ruwa mafita dauke da H2SO4 (0-5.5 kmol / m-3) da kuma NaCl (0-4.5 kmol / m-3) .A sakamakon H2SO4 da NaCl a kan lalata iri na SUS304 karfe da aka kuma yi karatu.Merwe et al. Lokacin lalata akan ƙarancin lalatawar damuwa na jirgin ruwa mai ƙarfi na A516 karfe.Yin amfani da maganin NS4 azaman maganin simintin ruwa na ƙasa, Ibrahim et al.14 ya binciki sakamakon tasirin muhalli irin su bicarbonate ion (HCO) maida hankali, pH da zafin jiki akan damuwa lalata bututun bututun API-X100 bayan kwasfa da shafi.Shan et al.15 yayi karatu da bambancin dokar danniya lalata fatattaka mai saukin kamuwa da austenitic bakin karfe 00Cr18Ni10 tare da zafin jiki a karkashin yanayi daban-daban zafin jiki (30 ~ 250 ℃) a karkashin yanayin da baki ruwa matsakaici a kwaikwaya kwal-to-hydrogen shuka ta SSRT.Han et al.16 halin da hydrogen embriltment matattu na samfurin-sussibility da jinkirin yin amfani da hydrogen embriltment high-sampibility da aka yi amfani da. SSRT.Zhao17 yayi nazari akan tasirin pH, SO42-, Cl-1 akan halayen lalatawar danniya na GH4080A gami da SSRT.Sakamakon ya nuna cewa raguwar ƙimar pH, mafi muni da juriya na lalatawar GH4080A alloy.Yana da ƙarancin damuwa na lalatawa ga Cl-1, matsakaicin yanayin zafi a cikin yanayin zafi ba. sion akan 20MnTiB karfe mai ƙarfi mai ƙarfi.
Don gano dalilan da suka haifar da gazawar bolts masu ƙarfi da aka yi amfani da su a cikin gadoji, marubucin ya gudanar da jerin bincike. An zaɓi samfurori masu ƙarfin ƙarfin ƙarfi, kuma an tattauna dalilan rashin nasarar waɗannan samfurori daga ra'ayi na sinadaran sinadaran, karaya microscopic ilimin halittar jiki, tsarin metallographic da kuma injiniya Properties analysis19, 20.Based a cikin wani binciken da aka yi a cikin shekaru na baya-bayan nan a cikin bincike na bincike na Chopheric. Lating yanayin danshi na Chongqing an tsara shi.Stress lalata gwaje-gwaje, electrochemical lalata gwaje-gwaje da kuma lalata gajiya gwaje-gwaje na high-ƙarfi bolts a Chongqing simulated m yanayi da aka za'ayi. pic analysis, da surface lalata kayayyakin.
Chongqing yana kudu maso yammacin kasar Sin, kogin Yangtze na sama, kuma yana da yanayin damina mai danshi.Matsakaicin zafin jiki na shekara ya kai 16-18 ° C, matsakaicin yanayin zafi na shekara-shekara ya fi 70-80%, sa'o'in hasken rana na shekara-shekara na sa'o'i 1000-1400, kuma yawan hasken rana yana da kashi 25 kawai.
Dangane da rahotannin da ke da alaƙa da hasken rana da zafin yanayi a Chongqing daga 2015 zuwa 2018, matsakaicin zafin rana a Chongqing yana da ƙasa da 17 ° C kuma ya kai 23 ° C.Mafi girman zafin jiki a jikin gadar Chaotianmen Bridge a Chongqing na iya kaiwa 50°C °C21,22.Saboda haka, an saita matakan zazzabi don gwajin lalata damuwa a 25°C da 50°C.
Ƙimar pH na simulated lalata bayani kai tsaye ya ƙayyade adadin H +, amma ba yana nufin cewa ƙananan pH darajar ba, da sauƙi lalata yana faruwa.Tasirin pH akan sakamakon zai bambanta don kayan aiki da mafita daban-daban. Domin ya fi kyau nazarin tasirin simulated lalata bayani a kan danniya lalata aiki na high-ƙarfi kusoshi, da danniya da kuma 5 sets corrosion.5.5. a hade tare da binciken wallafe-wallafe23 da kewayon pH na ruwan sama na shekara-shekara a Chongqing.2010 zuwa 2018.
Mafi girman maida hankali na maganin lalata da aka yi da simulated, mafi yawan abun ciki na ion a cikin simulated lalata bayani, kuma mafi girma tasiri a kan kayan kayan aiki.Domin yin nazarin sakamakon da aka yi amfani da shi na maganin lalata da aka yi a kan damuwa da damuwa na ƙwanƙwasa mai ƙarfi, dakin gwaje-gwaje na wucin gadi ya haɓaka gwajin lalata ya gane, kuma an saita ƙaddamar da ƙaddamarwa na asali zuwa matakin lalata 4 ba tare da ƙaddamar da ƙaddamarwa ba. ×), 20 × na asali na siminti na simintin maganin lalata (20 ×) da 200 × na asali na simintin maganin lalata (200 ×).
Yanayin da zafin jiki na 25 ℃, pH darajar 5.5, da kuma maida hankali na asali simulated lalata bayani shine mafi kusa da ainihin yanayin amfani da ƙuƙuka masu ƙarfi don gadoji. Duk da haka, don hanzarta tsarin gwajin lalata, yanayin gwaji tare da zazzabi na 25 ° C, pH na 5.25 na farko da aka saita a matsayin rukuni na lalata da kuma ƙaddamar da ƙaddamarwa na 5.20 yayin da aka saita ma'auni na corrosion. Sakamakon zafin jiki, maida hankali ko darajar pH na simulated lalata bayani a kan aikin lalatawar damuwa na ƙwanƙwasawa mai ƙarfi an bincika bi da bi, wasu dalilai sun kasance ba su canza ba, wanda aka yi amfani da shi azaman gwajin gwaji na ƙungiyar kulawa.
Dangane da bayanin ingancin yanayi na yanayi na 2010-2018 da ofishin kula da muhalli da muhalli na Chongqing na birnin Chongqing ya bayar, da kuma nunin abubuwan hazo da aka ruwaito a cikin Zhang24 da sauran wallafe-wallafen da aka ruwaito a Chongqing, wani maganin lalata da aka kwaikwayi bisa kara yawan taro na SO42- an tsara shi. Ana nuna maganin lalata simulated a cikin Table 1:
Ana shirya maganin lalata da aka kwatanta ta hanyar hanyar daidaita ma'auni na ion sinadarai ta amfani da reagents na nazari da ruwa mai tsafta. An daidaita darajar pH na maganin lalata da aka kwatanta tare da madaidaicin pH mita, maganin nitric acid da sodium hydroxide bayani.
Domin yin kwatankwacin yanayin danshi a Chongqing, an yi gyare-gyare na musamman da kuma tsara ma'aunin gishiri na gishiri25. Kamar yadda aka nuna a cikin Hoto na 1, kayan aikin gwaji yana da tsarin guda biyu: tsarin feshin gishiri da tsarin hasken wuta. Abubuwan ma'auni na zafin jiki, waɗanda ke jin yanayin zafi a cikin ɗakin gwaji. Sashin kulawa yana kunshe da microcomputer, wanda ke haɗa ɓangaren feshi da ɓangaren shigarwa don sarrafa dukkanin tsarin gwaji. An shigar da tsarin hasken wuta a cikin ɗakin gwajin gishiri don yin amfani da hasken rana.
An yi amfani da samfurori na lalata a ƙarƙashin nauyin kullun daidai da NACETM0177-2005 (Laboratory Testing of Sulfide Stress Cracking and Stress Corrosion Cracking Resistance of Metals in a H2S Environment) .Stress lalata samfurori an fara tsaftacewa tare da acetone da ultrasonic inji tsaftacewa, sa'an nan kuma sanya man fetur da aka bushe a cikin tanda mai tsabta. mber na gishiri SPRAY gwajin na'urar don kwaikwaya da lalata halin da ake ciki a cikin m yanayi yanayi na Chongqing.A cewar daidaitattun NACETM0177-2005 da gishiri SPRAY gwajin misali GB/T 10,125-2012, da akai load danniya lalata gwajin lokaci a cikin wannan binciken ne uniformly ƙaddara don zama 168 h. TS Samfurin da za'ayi a kan lalata 1 yanayi a ƙarƙashin yanayin lalata 8 M. Na'urar gwaji ta tensile, da kayan aikinsu na injiniya da kuma ɓarnawar ƙwayoyin halittar jiki da aka bincika.
Hoto na 1 yana nuna macro- da micro-morphology na ɓarkewar farfajiya na babban ƙarfin bolt danniya lalata samfurori a ƙarƙashin yanayi daban-daban na lalata.2 da 3 bi da bi.
Macroscopic ilimin halittar jiki na danniya lalata samfurori na 20MnTiB high-ƙarfi bolts a karkashin daban-daban simulated lalata muhallin: (a) babu lalata;(b) sau 1;(c) 20 ×;(d) 200 ×;(e) pH3.5;(f) pH 7.5;(g) 50°C.
Micromorphology na samfuran lalata na 20MnTiB masu ƙarfi masu ƙarfi a cikin yanayi daban-daban na lalata (100×): (a) 1 lokaci;(b) 20 ×;(c) 200 ×;(d) pH3.5;(e) pH 7.5;(f) 50°C.
Ana iya gani daga Fig. 2a cewa yanayin da ba a ba da shi ba tare da wani nau'i mai ƙarfi mai ƙarfi mai ƙarfi mai ƙarfi yana nuna haske mai haske na ƙarfe ba tare da lalata ba.Duk da haka, a ƙarƙashin yanayin asali na simulated lalata bayani (Fig. 2b), samfurin samfurin ya kasance an rufe shi da wani tanki da launin ruwan kasa-jajayen lalata samfurori, da kuma wasu wuraren da aka yi amfani da su a fili na samfurin luster kawai. Maganin lalata da aka kwatanta ba shi da tasiri a saman samfurin.Duk da haka, a ƙarƙashin yanayin 20 × na asali na simulated lalata bayani maida hankali (Fig. 2c), saman da high-ƙarfi aron kusa samfurin an rufe gaba daya da wani babban adadin tan lalata kayayyakin da wani karamin adadin launin ruwan kasa-ja lalacewa.samfurin, babu wani fili karfe luster da aka samu, kuma akwai wani karamin adadin launin ruwan kasa samfurin. na asali simulated lalata bayani maida hankali (Fig. 2d), saman samfurin gaba daya an rufe shi da launin ruwan kasa kayayyakin lalata, da launin ruwan kasa-baki kayayyakin lalata bayyana a wasu wurare.
Yayin da pH ya ragu zuwa 3.5 (Fig. 2e), samfurori masu launi masu launin tan sun kasance mafi yawa a saman samfurori, kuma an cire wasu samfurori na lalata.
Hoto na 2g ya nuna cewa yayin da yawan zafin jiki ya karu zuwa 50 ° C, abubuwan da ke cikin samfurori masu launin ruwan kasa-jaya a saman samfurin suna raguwa sosai, yayin da samfurori masu launin ruwan kasa mai launin ruwan kasa suna rufe saman samfurin a cikin babban yanki. Ƙwararren samfurin lalata yana da sauƙi, kuma wasu samfurori masu launin launin ruwan kasa suna kwashe.
Kamar yadda aka nuna a cikin Hoto na 3, a ƙarƙashin yanayi daban-daban na lalata, samfurori na lalata a saman 20MnTiB high-karfin aron ƙarfe danniya na lalata samfurori an lalata su a fili, kuma kauri daga cikin lalata ya karu tare da karuwa da ƙaddamar da ƙaddamarwa na simulated. Mafi girman Layer na samfuran lalata an rarraba su daidai, amma adadi mai yawa na fashe sun bayyana;ciki Layer ne sako-sako da gungu na lalata kayayyakin.A karkashin yanayin 20 × asali simulated lalata bayani maida hankali (Fig. 3b), da lalata Layer a saman da samfurin za a iya raba uku yadudduka: da outermost Layer ne yafi tarwatsa gungu lalata kayayyakin, wanda su ne sako-sako da kuma porous, kuma ba su da wani kyau m yi;Matsakaicin matsakaicin nau'in nau'in samfurin lalata ne, amma akwai fashe-fashe a bayyane, kuma ions masu lalata suna iya wucewa ta cikin tsagewar kuma su lalata tushen;ciki Layer ne mai m lalata samfurin Layer ba tare da fili fasa, wanda yana da kyau m sakamako a kan substrate.A karkashin yanayin 200 × asali simulated lalata bayani taro (Fig. 3c), da lalata Layer a kan surface na samfurin za a iya raba uku yadudduka: da outermost Layer ne bakin ciki da kuma uniform lalata samfurin Layer;Layer na tsakiya galibi yana da nau'in petal da lalata mai siffa mai siffar flake Layer na ciki shine samfurin lalata mai yawa ba tare da fashe-fashe da ramuka ba, wanda ke da tasirin kariya mai kyau akan ma'aunin.
Ana iya gani daga siffa 3d cewa a cikin simulated lalata yanayi na pH 3.5, akwai adadi mai yawa na flocculent ko allura-kamar lalata kayayyakin a saman 20MnTiB high-ƙarfi aron kusa samfurin 20MnTiB.An yi hasashe cewa waɗannan samfuran lalata sun fi γ-FeOOH Layer da ƙarami Layer na γ-FeOOH. bayyanannun fasa.
Za a iya gani daga siffa 3f cewa lokacin da zafin jiki ya karu zuwa 50 ° C, ba a sami wani tsatsa mai tsatsa na ciki ba a cikin tsarin lalata, wanda ke nuna cewa akwai gibi a tsakanin yadudduka na lalata a 50 ° C, wanda ya sa substrate ba a rufe shi da kayan lalata ba.Yana ba da kariya daga ƙãra halin lalata substrate.
Ana nuna kaddarorin injina na bolts masu ƙarfi a ƙarƙashin lalatawar damuwa na yau da kullun a cikin mahalli masu lalata daban-daban a cikin Tebura 2:
Ana iya gani daga Table 2 cewa kayan aikin injiniya na 20MnTiB high-arfin bolt specimens har yanzu sun cika daidaitattun buƙatun bayan busassun bushe-bushe sake zagayowar haɓaka gwajin lalata a cikin yanayi daban-daban na lalata, amma akwai wani lalacewa idan aka kwatanta da waɗanda ba a ba da izini ba. Samfuran. maida hankali na simulated bayani, da elongation na samfurin ya ragu da muhimmanci.The inji Properties suna kama da yawa na 20 × da 200 × asali simulated lalata mafita.Lokacin da pH darajar da simulated lalata bayani ya ragu zuwa 3.5, da ƙarfi da ƙarfi da elongation na samfurori sun ragu.Lokacin da zafin jiki ya tashi zuwa 50 ° C mai girma da ƙarfi da ƙarfi don rage girman girman girman girman girman girman girman girman girman girman girman girman girman girman girman girman girman girman girman girman girman girman girman girman girman girman girman girman girman girman girman girman girman girman girman da girman girman girman girman 50 ° C da tsayin tsayin tsayi. daraja.
An nuna nau'i-nau'i na ɓarke ​​​​na 20MnTiB babban ƙarfin bolt danniya na lalata samfurori a ƙarƙashin yanayi na lalata daban-daban a cikin hoto na 4, wanda shine macro-morphology na fracture, yankin fiber a tsakiyar raguwa, ƙananan lebe na ƙananan ƙwayar cuta, da kuma saman samfurin.
Macroscopic da microscopic morphologies fracture 20MnTiB high-ƙarfin bolt samfurori a daban-daban simulated lalata muhallin (500×): (a) babu lalata;(b) sau 1;(c) 20 ×;(d) 200 ×;(e) pH3.5;(f) pH7.5;(g) 50°C.
Ana iya gani daga hoto na 4 cewa karyewar samfurin 20MnTiB mai ƙarfi mai ƙarfi a ƙarƙashin yanayin lalata da aka kwaikwayi daban-daban yana gabatar da irin karyewar mazugi.Idan aka kwatanta da samfurin da ba a yi ba (Fig. 4a), tsakiyar yanki na yanki na fiber yana da ƙananan ƙananan., Ƙarƙashin leɓan lebe ya fi girma.Wannan yana nuna cewa kayan aikin injiniya na kayan sun lalace sosai bayan lalata.With karuwa na simulated lalata bayani maida hankali, da ramuka a cikin fiber yankin a tsakiyar karaya ya karu, da kuma bayyane hawaye seams ya bayyana.Lokacin da maida hankali ya karu zuwa 20 sau na na asali simulated lalata bayani, a fili lalata gefen ramuka da kuma akwai wani fili lalata gefen ramukan da aka bayyana a saman lebe da samfurin da ya bayyana a saman lebe. samfurori a saman.samfurin.
An ƙididdige shi daga Hoto na 3d cewa akwai ɓarna a fili a cikin layin lalata a saman samfurin, wanda ba shi da tasiri mai kyau na kariya akan matrix.A cikin simulated lalata bayani na pH 3.5 (Hoto 4e), saman samfurin ya lalace sosai, kuma yankin fiber na tsakiya ba shakka ƙarami ne., Akwai adadi mai yawa na tsagewar hawaye marasa daidaituwa a tsakiyar yankin fiber. Tare da karuwar ƙimar pH na simulated corrosion solution, yanki mai tsagewa a cikin yanki na fiber a tsakiyar raguwa yana raguwa, ramin yana raguwa a hankali, kuma zurfin rami ya ragu a hankali.
Lokacin da yawan zafin jiki ya karu zuwa 50 ° C (Fig. 4g), yanki mai laushi na raguwa na samfurin shine mafi girma, ramukan da ke cikin tsakiyar fiber na tsakiya ya karu sosai, kuma zurfin rami ya karu, kuma haɗin tsakanin gefen lebe mai laushi da samfurin samfurin ya karu.Kayayyakin lalata da ramuka sun karu, wanda ya tabbatar da zurfafa zurfafawa na lalata substrate da aka nuna a cikin siffa 3f.
A pH darajar da lalata bayani zai haifar da wasu lalacewa ga inji Properties na 20MnTiB high-ƙarfi kusoshi, amma sakamakon ba shi da muhimmanci.A cikin lalata bayani na pH 3.5, babban adadin flocculent ko allura-kamar lalata kayayyakin da ake rarraba a saman da samfurin, da lalata Layer yana da fili mai kyau fashe, wanda ba zai iya samar da wani babban adadin lalata. samfurori a cikin ƙananan ƙwayoyin cuta na samfurin fracture. Wannan yana nuna cewa ikon samfurin don tsayayya da lalacewa ta hanyar karfi na waje yana raguwa sosai a cikin yanayin acidic, kuma matakin damuwa na lalata kayan abu yana ƙaruwa sosai.
Maganin lalata na asali na asali yana da ɗan tasiri a kan kayan aikin injiniya na samfurori masu ƙarfi masu ƙarfi, amma yayin da ƙaddamar da maganin lalatawar da aka kwatanta ya karu zuwa sau 20 na ainihin maganin lalata, kayan aikin injiniya na samfurori sun lalace sosai, kuma akwai lalacewa a fili a cikin ƙananan ƙananan ƙwayoyin cuta.ramuka, fashewa na biyu da kuma samfuran lalata da yawa.Lokacin da aka ƙaddamar da ƙaddamarwar simintin gyare-gyare na simulated daga sau 20 zuwa sau 200 na asali na simintin gyare-gyare na gyare-gyare na asali, sakamakon ƙaddamarwar ƙwayar cuta a kan kayan aikin injiniya na kayan ya raunana.
Lokacin da simulated lalata zafin jiki ne 25 ℃, da yawan amfanin ƙasa ƙarfi da tensile ƙarfi na 20MnTiB high-ƙarfi aron kusa samfurori ba su canja da yawa idan aka kwatanta da uncorroded samfurori.Duk da haka, a karkashin simulated lalata yanayin zafin jiki na 50 °C, da tensile ƙarfi da kuma elongation na samfurin ya ragu sosai, ƙimar samfurin ya ragu sosai. mafi girma, kuma akwai dimples a cikin tsakiyar fiber yankin. Mahimmanci ya karu, zurfin rami ya karu, samfurori na lalata da kuma ramukan lalata sun karu.Wannan yana nuna cewa yanayin yanayin lalata na zafin jiki yana da tasiri mai girma akan kayan aikin injiniya na ƙwanƙwasa mai ƙarfi, wanda ba a bayyane yake a dakin da zafin jiki ba, amma mafi mahimmanci lokacin da zafin jiki ya kai 50 ° C.
Bayan gwajin lalata na cikin gida wanda ke simulating yanayin yanayi a Chongqing, ƙarfin tensile, ƙarfin yawan amfanin ƙasa, haɓakawa da sauran sigogi na 20MnTiB babban ƙarfin kusoshi sun ragu, kuma an sami lahani a bayyane.Tun da kayan yana ƙarƙashin damuwa, za a sami babban yanki na gurɓataccen gurɓataccen abu a cikin hanzarin haɓakar haɓakawa da haɓaka haɓakar filastik. -ƙarar ƙarfi, rage ikon tsayayya da nakasawa ta hanyar ƙarfin waje, da haɓaka yanayin lalatawar damuwa.
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