高速硬切削表面白层马氏体相变

doi:10.13229/j.cnki.jdxbgxb20180404

摘要/Abstract

摘要：

基于白层相变机理建立了硬切削过程产生的切削热影响下淬硬GCr15钢白层马氏体临界相变温度M _S的模型，并结合马氏体分数模型计算白层的理论马氏体分数。将模型计算得到的马氏体分数与实验测得的马氏体分数相对比，结果表明：理论计算的马氏体分数高于实验测量值。白层内马氏体形成时受切削热与塑性变形的耦合影响，结合透射电镜实验结果，揭示了切削速度与后刀面磨损量对白层内马氏体分数的影响规律。

关键词: 机械制造及其自动化, 白层, 马氏体临界相变温度, 马氏体分数, 切削热, 塑性变形

Abstract:

The martensitic transformation of surface white layer in high speed hard cutting is studied in this paper. First, a martensite critical phase transformation temperature model was developed based on the phase transformation mechanism of white layer. Then the theoretical martensite fraction of the white layer was calculated combined with the M _S model. The calculated martensite fraction was compared with the martensite fraction measured by experiments. The results show that the value of the calculated martensite fraction is higher than that of the experimental value. The formation of martensite of the white layer is influenced by cutting heat and plastic deformation. The influences of cutting speed and flank wear on the martensite fraction are analyzed combined with the transmission electron microscope experiments.

Key words: mechanical manufacturing and automation, white layer, critical martensite phase transformation temperature, martensite fraction, cutting heat, plastic deformation

中图分类号:

TG142.1

段春争,张方圆,寇文能,魏斌. 高速硬切削表面白层马氏体相变[J]. 吉林大学学报(工学版), 2019, 49(5): 1575-1583.

Chun-zheng DUAN,Fang-yuan ZHANG,Wen-neng KOU,Bin WEI. Martensitic transformation of surface white layer in high speed hard cutting[J]. Journal of Jilin University(Engineering and Technology Edition), 2019, 49(5): 1575-1583.

图/表 10

图1

表1

图2

图3

图4

表2

拟合采用的参数数据"

温度/ K	屈服强度/ MPa	$Δ G α ? M$ /(J·mol^-1）
293	1352	3739
573	880	2748
773	600	2160
1073	474	1895

表2

图5

图6

图7

图8

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元素	质量分数/%	摩尔分数
Fe	97.5	0.94
C	1	0.045
Cr	1.5	0.015

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