摘要
以45钢为试验材料,研究工艺参数对45钢大电流电接触表面淬火的影响。观察分析淬火层的金相组织,并测量其厚度和硬度分布。结果表明,电接触表面淬火后的淬火层由硬化区和过渡区组成,硬化区为均匀细小的条状马氏体,过渡区为马氏体、珠光体和铁素体的混合组织。工作电流I=17kA、接触压力F=600～800N、工件转速Vr=0.5～0.75r/min时,淬火层厚度为0.78mm,硬化区硬度可达780HV0.1左右。当电参数一定,其他工艺参数改变时,工件表面硬度与淬火层厚度基本不受影响。但经过新型电接触表面淬火处理后,工件表面粗糙度降低,由Ra1.412μm下降至Ra0.732μm。
The electric contact quenching on 45 steel was studied.The microstructure in the quenching layer was observed and analyzed,and the thickness and the hardness distribution of quenching layer were also tested.The results show that the quenching layer consists of hardened layer and transition layer.The microstructure of the hardened layer is some fine lath martensite,and the microstructure of transition layer is the mixture of martensite,pearlite and ferrite.While the electric current was 17kA,the contact pressure was 600～800N,and the rotate speed of sample was 0.5～0.75r/min,the thickness of quenching layer was about 0.78mm,the hardness of hardening layer reached about 780HV0.1.When the electric parameter was certain,the change of technology parameters didn＇t influence on the thickness of quenching layer and the surface hardness.Meanwhile,the roughness of surface after electric contact surface quenching was reduced from 1.412μm to 0.732μm.
出处
《现代制造工程》
CSCD
北大核心
2010年第6期69-72,共4页
Modern Manufacturing Engineering
关键词
电接触
表面淬火
金相检验
工艺参数
electric-contact
surface quenching
metallographic examination
technology parameters
