切削深度对单晶γ-TiAl合金亚表面缺陷及残余应力的影响

doi:10.11896/cldb.19120052

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Abstract In this paper, the molecular dynamics method was used to simulate the cutting process of single crystal γ-TiAl alloy under different cutting depths. The evolution of microscopic defects and the evolution of internal stress after stable cutting at different depths of cutting was analyzed, and the distribution of residual stress and von Mises stress at different cutting depths were studied, the relationship between the evolution of microscopic defects and internal stress at different cutting depths was discussed. The results show that the dislocation reaction and the stacking fault evolution increase with the increase of cutting depth, and the dislocation reaction has a great influence on the formation of the Lomer-Cottrell dislocation. The residual compressive stress formed by the surface of the tool extrusion workpiece is affected by the stacking fault evolution and dislocation reaction, and the severity of the dislocation reaction affects the internal stress. The residual compressive stress exists on a certain depth of the subsurface. It is also found that the change of cutting depth had little effect on von Mises stress.

Key words： single crystal γ-TiAl alloy nano-cutting residual stress dislocation reaction stacking fault

Published: 03 August 2021

CLC number:	TG501.1
	TG146.23

Fund:National Natural Science Foundation of China (52065036), Program for Changjiang Scholars and Innovative Research Team in University of Ministry of Education of China (IRT_15R30) and Hongliu First-class Disciplines Development Program of Lanzhou University of Technology.

About author:: Qi Wang, postgraduate, studies at School of Mechanical and Electronical Engineering, Lanzhou University of Technology. His research interests is cutting surface integrity and evaluation methods.
Ruicheng Feng, Ph.D., professor, now works at School of Mechanical and Electronical Engineering, Lanzhou University of Technology. His research inte-rests are mechanical system dynamic performance testing and control technology, cutting surface integrity and evaluation methods, and mechanical strength theory.

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	WANG Qi
	FENG Ruicheng
	FAN Lihe
	SHAO Zihao
	DONG Jianyong

Cite this article:

WANG Qi,FENG Ruicheng,FAN Lihe, et al. Effect of Cutting Depth on Subsurface Defects and Residual Stress in Single Crystal γ-TiAl Alloy[J]. Materials Reports, 2021, 35(14): 14089-14095.

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http://www.mater-rep.com/EN/10.11896/cldb.19120052 OR http://www.mater-rep.com/EN/Y2021/V35/I14/14089

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