摘要
针对淬火工艺导致材料表面引入较大残余压应力的问题,采用高能量密度脉冲电流的方法消减淬火Cr12MoV钢残余应力。采用不同密度的脉冲电流对试样进行处理,并采用小孔法和硬度测试法分析脉冲电流处理前后材料的残余应力和表面硬度,在此基础上建立电致塑性模型框架阐述脉冲电流对残余应力和表面硬度的作用机理。结果表明:高能量密度脉冲电流能够有效地消减Cr12MoV钢淬火残余应力,且在一定范围内提高脉冲电流的密度可以提高残余应力的消减效果;淬火Cr12MoV钢表面硬度从HRC 61~HRC 64降低到HRC 56~HRC 59;位错密度的减小是残余应力释放和表面硬度降低的本质原因。高能量密度脉冲电流能够被用来消减淬火工艺引起的残余应力,提高零件的使用寿命,具有一定的工程应用价值。
Aiming at the problem of introducing large residual compressive stress on the surface of the material due to the quenching process,the high energy density electric current pulse(ECP) technology was introduced to reduce the residual stress in Cr12 MoV steel.The samples were treated with different density ECP and the residual stress and surface hardness of the materials before and after ECP were analyzed by the hole-drilling method and hardness test method.Based on this,an electroplastic model framework was established to explain the mechanism of ECP on residual stress and surface hardness.The results show that high energy density ECP can effectively eliminate the residual stress of quenched Cr12 MoV steel,and increasing the density of the ECP within a certain range can improve the residual stress reduction effect;Surface hardness of quenched Cr12 MoV steel decreased from 61 HRC^64 HRCto 56 HRC^59 HRC;The reduction in dislocation density is an essential cause of residual stress release and surface hardness reduction.The high energy density ECP can be used to reduce the residual stress caused by the quenching process and improve the service life of the parts,which has certain engineering application value.
作者
王思淇
顾邦平
胡雄
徐冠华
王萍
庄佳奕
吴辰宇
WANG SiQi;GU BangPing;HU Xiong;XU GuanHua;WANG Ping;ZHUANG JiaYi;WU ChenYu(College of Logistics Engineering,Shanghai Maritime University,Shanghai 201306,China;Zhejiang Province Key Laboratory of Adoanced Manufacturing Technology,Zhejiang University,Hangzhou 310027,China)
出处
《机械强度》
CAS
CSCD
北大核心
2020年第6期1343-1347,共5页
Journal of Mechanical Strength
基金
国家自然科学青年基金项目(51805477)
上海市青年科技英才扬帆计划(18YF1409800)资助。
