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第18卷第4期 湖南工程学院学报 Vo1.18.No.4 200812 JournalofHunanInstituteofEngineering Dec.2008 :2008-06-19:(07jj6077):(1962-),,,:.40Cr高为国,董丽君,胡凤兰,覃 波(,411101) :根据40Cr钢汽车半轴的实际淬火工艺,分析了淬火开裂的主要原因,并针对淬火开裂的主要形式,制定出了三种热处理工艺方案并实施.通过分析热处理后的金相显微组织和硬度数据,确定出最终的热处理工艺及其主要参数.试验结果表明:40Cr钢在860℃油淬后,再进行860℃淬入5%~10%的盐水冷却、580℃回火,使强度、硬度低的网状铁素体相对量有所下降,可有效的防止淬火开裂,并提高其疲劳寿命.:汽车半轴;淬火开裂;热处理工艺;力学性能;显微组织:TG162.71 :A :1671-119X(2008)04-0033-040 ,,,40Cr,.40Cr,,,,、,,、、..,40Cr,,、,,.,,,,.,.,40Cr,(、),,,,.,,,、、,.,,.,,,.29~34HRC,,(3/4).40Cr,,,40Cr,;,40Cr.DOI:10.15987/j.cnki.hgbjbz.2008.04.0031 ,.,,.40Cr850℃.,,.,,.,,,Ar3,,,28.,,1.1 200× ,,,,、.,(),,().40Cr、、,,,.40Cr,16,,,,,,.(),,,,,.2 40Cr,:※※()※※※※※※.40Cr,1.1 123860℃(25min)+520℃(70min)860℃(25min)(5%~10%)+580℃(70min)860℃(25min)++860℃(25min)(5%~10%)+580℃(70min)2.1 HRS-150,2.2 (HRC)12345678910129.132.932.230.933.331.834.132.034.333.632.4229.330.430.329.129.730.030.529.330.430.029.9328.931.729.530.030.230.030.030.330.430.030.134 20082.2 40Cr12.、,.2 40Cr1500×,.220~330HBS.、,,.40Cr2、,3.,、.,,,,.,,,,.3 40Cr2500×,.,,,,(,).,,,,,.,.,,.40Cr34.,.3 40Cr3500×,.,()()、..,,.31、2,、.,1,;2,、.340Cr,.3 40Cr,,、;,,(),.269~321HBS.(1),40Cr354 :40Cr、、,,、.,:①:860℃,25min,;②:860℃,25min,5%~10%();580℃,70min,.(2).、、,.(3):、,40Cr,40Cr.参 考 文 献[1] .[J].,2006,(7).[2] ,.[J].,2007,(2):13.[3] .40Cr[J].,2005,(5):110-111.[4] .[M].,2006.[5] .[J].,2004,(9):10-11.[6] ,.[J].,2004,(7):91-94.[7] .[M].,2007:175.[8] .40Cr[J].,2005,(7):26.[9] .40Cr[J].,2003,(10):44.[10],, ,.40Cr[J].,2004,(2):32-33.[11].[M].:,2006.[12], .[J].,2005,13(1).[13].300[M].:,2007.[14].[M].:,2007.[15],.45[J].,2007,17(3):26-27.AnalysisofQuenchingCrackingandImprovementofHeatTreatmentProcessforSteel40CrAxleVehicleGAOWei-guo,DONGLi-jun,HUFeng-lan,QINBo(CollegeofMech.Eng.,HunanInstituteofEngineering,Xiangtan411101,China)Abstract:Accordingtotheactualquenchingprocessofsteel40Craxlevehicle,themainreasonsforitsquenchingcrackingareanalyzed.Consideringthemainformsofquenchingcracking,threekindsofheattreatmentprocessesareimplemented.Basedonthemicrostructurestateandthehardnessdataafterheattreatment,thefinalheattreatmentprocessanditsmainparametersaredetermined.Theresultsshowthatafter860℃oilquenching,andthen860℃quenchingwith5%to10%ofsaltwatercoolingand580℃tempering,thestrengthandhardnessoftheferriteinsteel40Crarereducedrelatively,whicheffectivelypreventsquenchingfromcrackingandimprovesthefatiguelife.Keywords:axlevehicle;quenchingcracking;heattreatmentprocess;mechanicalproperties;microstruc-ture36 2008
本文标题:40Cr钢汽车半轴淬火缺陷分析及热处理工艺改进-高为国
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