Ni元素对曲轴用42CrMoA钢力学性能的影响  

THE INFLUENCE OF Ni ELEMENT ON THE MECHANICAL PROPERTIES OF 42CrMoA STEEL FOR CRANKSHAFT

作　　者：常志刚 杨国 赵换霞 时向涛 Chang Zhigang;Yang Guo;Zhao Huanxia;Shi Xiangtao(Qingdao Special Steel Co.,Ltd.,Qingdao 266500,Shandong)

机构地区：[1]青岛特殊钢铁有限公司,山东青岛266500

出　　处：《河北冶金》2024年第6期20-23,共4页Hebei Metallurgy

摘　　要：为改善曲轴用42CrMoA钢调质后的力学性能,满足重型商用车发动机曲轴用钢要求,分别进行了0.03%Ni、0.08%Ni、0.14%Ni、0.20%Ni含量的合金化试验。采用ICAP6300等离子光谱分析仪、蔡司光学显微镜、万能试验机及冲击试验机进行42CrMoA钢化学成分、力学性能、显微组织检验对比分析。结果表明,在42CrMoA钢中添加0.14%~0.20%的Ni元素,试验钢的CCT曲线右移、珠光体转变孕育时间增加了58 s、珠光体临界转变温度降低3.17℃、珠光体比例增加6.14%。试验钢经860℃油淬、560℃回火处理后,抗拉强度、屈服强度及不同温度下的冲击韧性均明显提高,钢材综合力学性能显著改善,说明添加0.14%~0.20%的Ni元素可以提高铁素体强度,进而提高钢材的力学性能,满足客户使用需求。In order to improve the mechanical properties of 42CrMoA steel quenched and tempered for crankshafts and meet the requirements of steel for heavy-duty commercial vehicle engine crankshafts,alloying tests with 0.03%Ni,0.08%Ni,0.14%Ni,and 0.20%Ni contents were conducted.Comparative analysis of chemical composition,mechanical properties,and microstructure of 42CrMoA steel was conducted using ICAP6300 plasma spectrometer,Zeiss optical microscope,universal testing machine,and impact testing machine.The results showed that adding 0.14%to 0.20%Ni element to 42CrMoA steel caused the CCT curve of the experimental steel to shift to the right,the pearlite transformation incubation time to increase by 58 seconds,the critical pearlite transformation temperature to decrease by 3.17℃,and the pearlite proportion to increase by 6.14%.After oil quenching at 860℃and tempering at 560℃,the tensile strength,yield strength and impact toughness at different temperatures of the experimental steel were significantly improved.The comprehensive mechanical properties of the steel were significantly improved,indicating that adding 0.14%to 0.20%Ni element can increase the strength of ferrite,thereby improving the mechanical properties of the steel and meeting the needs of customers.

关 键 词：42CrMoA NI 强度 冲击韧性 金相组织 

分 类 号：TG142.1[一般工业技术—材料科学与工程]