钢的晶界马氏体形成与低温回火脆性

《钢的晶界马氏体形成与低温回火脆性》由会员上传分享，免费在线阅读，更多相关内容在学术论文-天天文库。

1、iGRAINBOUNDARYMARTENSITEFORMATIONANDTEMPERINGBRITTLENESSATLOWTEMPERATUREOFSTEELSABSTRACTThemartensitenucleationandtemperingbrittlenessofindustrialsteelhavebeenstudiedinthearticle,suchas:65Mn,CrWMn,50GrMn,5GrMnMo,42GrMo.Itindicatedthatthemartensitenucleationandgrowingatboundar

2、yofthepatentphaseatfirst,andtheshapeofthemartensiteislamellar.Thesesteelhavelargetemperbrittleness.TheplatemartensiteattheboundaryofthepatentphaseislessevidentinthesteelsincludingMo.Inouropinion,theplatemartensiteattheboundaryofthepatentphaseisthemainreasonthatleadtotheoccurr

3、enceoftemperingbrittleness.WealsoresearchesthetemperingbrittlenessofCrWMn,65Mnand50CrMnafterdifferentheattreatmentbyimpactexperiment.Theresultisthatthetemperingbrittlenessissmalleraftertemperingwhenthelowerbainiteinsteadoftheplatemartensiteatthegrain-boundaryofthepatentinthep

4、rocessofquenching.Observationofmorphologyoftheplatemartensitewereperformed.Analysisoftheplatemartensiteatthegrain-boundaryeffectonthemicrostructureinthetemperingprocess.Themartensiteatthegrain-boundarypromotesthediffusionofcarbonandPsegregationinthetemperingprocess.Itpromotes

5、temperingbrittlenessofsteels.Martensitesubstructureatthepatentphasegrain-boundaryhavetwincrystalanddislocation.Itisfoundthattheparentphaseiitransformsaroundthedefectsformingasessilemetastablemartensiticembryo,andthedislocationlooporgroupofloopsprovidedislocationsourceformarte

6、nsitetransformation.KEYWORDS:martensitetemperingbrittlenessgrain-boundarysegregationiii§1-1[1]Cohen[2][3][45][6-9]§1-21-2-11895OsmndAdolphMartens1(martensite)()-1924[10]EdgarBain“”fcc-bcc1926FinkCampbellx()(-FeFe3C)Ms-Fe-Nifccbcc2030-40NiFe-NiLi-Mg2001953BunshahMehl-7-10.53×1

7、0s1100m·s[11]1949GreningerTroianoBain[12]1948KurdjumovMaksimova0.6C-6MnKhandrosCu-A1-NiKurdjumov-170Au-Cu-Zn0.32cm·sCu-A1-Ni-1[13]10-510-6m·sfcc()hcp()Co0.4CC[14]1960kellyNuttingMorrisCohen19504080199350()Bain1924219531954W-L-RB-MWayman1964Shimizu0tsukaMuddleZrO2302251979ICOM

8、ATThomas19811983Ms0.12C-Ni-Cr[15]Magee0.27C-1CrMs39036570(1)(2)(3)Ni