Experiment research on grind-hardening of AISI5140 steel based on thermal compensation
Experiment research on grind-hardening of AISI5140 steel based on thermal compensation
复制标题
基于热补偿的AISI5140钢磨削硬化试验研究
DOI：
10.1007/s12206-016-0745-x
复制
发表时间：
2016-08-01
影响因子：
1.6
通讯作者：
Zhou, Zhixiong
中科院分区：
文献类型：
--
作者：
Huang, Xiangming;Ren, Yinghui;Zhou, Zhixiong
磨削硬化过程利用产生的热来诱导马氏体相变。然而，由于磨削力较大，磨削硬化过程中磨削表面会产生残余拉应力，从而限制了最大硬化层深度。提出了一种新的热补偿磨削淬硬技术。采用电阻加热对AISI 5140钢工件进行预热，在工件温度为25A ℃、120A ℃、180A ℃、240A ℃的条件下进行磨削。研究了磨削力、淬硬层深度、磨削表面残余应力、表面粗糙度和显微硬度等表面质量。实验结果表明，热补偿可获得由细晶马氏体组成的深层硬化层。磨削后的工件表面产生一定的残余压应力，且残余压应力值随预热温度的升高而增大。随着预热温度的升高，磨削力略有下降，表面粗糙度略有增加。与常规磨削淬硬工艺相比，淬硬层深度和残余应力分布均得到显著改善。
The grind-hardening process utilizes the heat generated to induce martensitic phase transformation. However, the maximum achievable harden layer depth is limited due to high grinding forces, and the tensile residual stress appears on the ground surface in the grind-hardening process. This paper proposes a new grind-hardening technology using thermal compensation. The workpiece of AISI5140 steel is preheated by electric resistance heating, and ground under the condition of the workpiece temperature 25A degrees C, 120A degrees C, 180A degrees C and 240A degrees C. The grinding force, harden layer depth and surface quality including residual stress on ground surface, surface roughness and micro-hardness are investigated. The experimental results show that a deep harden layer with a fine grain martensite can be obtained with the thermal compensation. The ground workpiece surface produces a certain compressive residual stress, and the residual compressive stress value increases with preheating temperature. As the preheating temperature increases, grinding force slightly decreases, while there is slightly increment of surface roughness. Compared with the conventional grind-hardening process, both the harden layer depth and residual stress distribution are significantly improved.