Journal of Jilin University(Engineering and Technology Edition) ›› 2019, Vol. 49 ›› Issue (5): 1575-1583.doi: 10.13229/j.cnki.jdxbgxb20180404

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Martensitic transformation of surface white layer in high speed hard cutting

Chun-zheng DUAN(),Fang-yuan ZHANG,Wen-neng KOU,Bin WEI   

  1. School of Mechanical Engineering, Dalian University of Technology, Dalian 116024, China
  • Received:2018-04-26 Online:2019-09-01 Published:2019-09-11

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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

CLC Number: 

  • TG142.1

Fig.1

Yield strength under different temperature"

Table 1

GCr15 parent phase chemical composition"

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

Fig.2

EPMA chemical element of hardened GCr15 steel"

Fig.3

TEM dark field image of white layer"

Fig.4

Curve of phase free energychanged with temperature"

Table 2

Parameters data used in fitting"

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

Fig.5

Fitting curve of Δ G α ? M changed with temperature"

Fig.6

Curve of - Δ G γ ? α changed with temperature"

Fig.7

Illustration of critical phase transition temperature"

Fig.8

Comparison of martensite fraction about theoretical value and experimental value"

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