40Cr钢双道搭接磨削淬硬回火软化特征  

Tempering softening characteristics of overlapping zones in double-passes grind-hardening process of 40Cr steel

作　　者：高顺兴 刘菊东 黄松伟 GAO Shun-xing;LIU Ju-dong;HUANG Song-wei(Department of Mechanical and Energy Engineering,Jimei University,Xiamen 361021,China;Key Technology University Engineering Research Center of Marine Platform Support System of Fujian Province,Xiamen 361021,China;Engineering Training Center,Jimei University,Xiamen 361021,China)

机构地区：[1]集美大学机械与能源工程学院,福建厦门361021 [2]海洋平台保障系统关键技术福建省高校工程研究中心,福建厦门361021 [3]集美大学工程训练中心,福建厦门361021

出　　处：《材料热处理学报》2020年第6期174-182,共9页Transactions of Materials and Heat Treatment

基　　金：国家自然科学基金(51676085);福建省自然科学基金(2018J01489)。

摘　　要：对退火态40Cr钢进行双道搭接磨削淬硬试验,并结合单道磨削淬硬试验和磨削淬硬表面温度仿真,研究了搭接量对软化区硬度分布、形状特征和组织形貌的影响。结果表明,第一道磨削淬硬表面存在回火软化现象。搭接量Cr=0时,软化区近似梯形,Cr≥1 mm时,软化区近似平行四边形。随着搭接量的增加,软化区宽度相应增大;其组织也由回火屈氏体、回火索氏体、铁素体、珠光体和马氏体转变为回火屈氏体、回火索氏体和马氏体。从提高磨削淬硬面积和磨削淬硬加工效率的角度出发,宜采用Cr=1 mm的搭接量。Effects of overlapping zones width(Cr)on hardness distribution,shape characteristics and microstructure of a grind-hardening component’s softening zone were investigated by means of double-passes overlapping grind-hardening experiments for annealed 40 Cr steel,combined with single-pass grind-hardening experiments and grind-hardening surface temperature simulation.The results show that the first-pass grind-hardening surface has tempering softening phenomenon.When the overlapping zones width Cr is 0,the softening zone is approximately trapezoid,and when the Cr is more than 1 mm,the softening zone is approximately parallelogram.The width of the softening zone increases accordingly with the increase of the overlapping zones width;its microstructure also changes from tempered troostite,tempered sorbite,ferrite,pearlite and martensite to tempered troostite,tempered sorbite and martensite.From the point view of improving the grind-hardening area and grind-hardening processing efficiency,it is advisable to use the overlapping zones width(Cr)of 1 mm.

关 键 词：双道磨削 磨削淬硬 软化区 显微组织 显微硬度 数值模拟 

分 类 号：TG142.3[一般工业技术—材料科学与工程]