35CrMoA钢的热处理工艺试验  

Trial Heat Treatment Processes for 35CrMoA Steel

作　　者：金帅 王会强[1] 赵建新 闫学兰 崔建英[4] 郭超 李文翔 JIN Shuai;WANG Huiqiang;ZHAO Jianxin;YAN Xuelan;CUI Jianying;GUO Chao;LI Wenxiang(College of Mechanical and Electrical Engineering,Hebei Agricultural University,Baoding 071066,Hebei China;Baoding DONGLI Machinery Co.,Ltd.,Baoding 071100,Hebei China;Baoding Golden Sunshine Energy Equipment Technology Co.,Ltd.,Baoding 071000,Hebei China;Juli Sling Co.,Ltd.,Baoding 072550,Hebei China;Hebei Kane Electromechanical Equipment Co.,Ltd.,Baoding 072450,Hebei China;Guantao Flying Machinery Equipment Manufacturing Co.,Ltd.,Handan 057750,Hebei China)

机构地区：[1]河北农业大学机电工程学院,河北保定071066 [2]保定市东利机械制造股份有限公司,河北保定071100 [3]保定金阳光能源装备科技有限公司,河北保定071000 [4]巨力索具股份有限公司,河北保定072550 [5]河北凯恩机电设备有限公司,河北保定072450 [6]馆陶县飞翔机械装备制造有限公司,河北邯郸057750

出　　处：《热处理》2024年第6期23-28,共6页Heat Treatment

基　　金：河北省科技计划项目(20312201D);河北省重大成果转化项目(21287001Z)。

摘　　要：为满足力学性能要求,对ϕ125mm的35CrMoA钢试棒进行了四种工艺的热处理,包括正火加亚温淬火、退火加亚温淬火和亚温淬火后于650~570℃回火。检测了热处理后钢的拉伸性能,-20℃、-35℃、-45℃冲击韧度,冲击试样的断口形貌,硬度和显微组织。结果表明:经840℃退火、810℃亚温淬火和570℃回火的35CrMoA钢力学性能性能满足要求;亚温淬火能使35CrMoA钢获得良好的低温冲击韧度;亚温淬火后回火温度从650℃降到570℃,钢的低温冲击韧度、断后伸长率和断面收缩率下降,强度提高;经不同工艺热处理的35CrMoA钢显微组织为回火索氏体和铁素体。In order to meet mechanical property requirements,the 125-mm-diam 35CrMoA steel test bars were heat treated by four types of procedure,among which are:annealing plus sub-critical quenching,normalizing plus sub-critical quenching,and tempering at temperatures varying from 650 to 570℃subsequent to sub-critical quenching.After heat treating,the steel was tested for tensile properties,impact toughnesses at-20℃,-35℃and-45℃,morphology of impact specimen fracture,hardness,and microstructure.The results indicated that(a)the 35CrMoA steel subjected to annealing at 840℃,sub-critical quenching from 810℃and tempering at 570℃exhibited mechanical properties which met the requirements;(b)the sub-critical quenching was able to cause 35CrMoA steel to have good low-temperature impact toughness;(c)with the decrease in tempering temperature after sub-critical quenching from 650 to 570℃,the steel decreased in low-temperature impact toughness,elongation and area reduction,and increased in strengths;and(d)the microstructure of the 35CrMoA steel heat treated by the different procedures consisted of tempered sorbite and ferrite.

关 键 词：35CRMOA钢 低温冲击韧度 回火温度 显微组织 

分 类 号：TG156[金属学及工艺—热处理]