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Evolution of surface grain structure and mechanical properties in orthogonal cutting of titanium alloy

Published online by Cambridge University Press:  28 November 2016

Jinxuan Bai ,
Qingshun Bai ,
Zhen Tong ,
Chao Hu  and
Xin He
Jinxuan Bai*
Affiliation:
School of Mechanical and Electrical Engineering, Harbin Institute of Technology, Harbin 150001, China
Qingshun Bai*
Affiliation:
School of Mechanical and Electrical Engineering, Harbin Institute of Technology, Harbin 150001, China
Zhen Tong
Affiliation:
School of Mechanical and Electrical Engineering, Harbin Institute of Technology, Harbin 150001, China; and Centre for Precision Technologies, University of Huddersfield, Huddersfield HD1 3DH, U.K.
Chao Hu
Affiliation:
School of Mechanical and Electrical Engineering, Harbin Institute of Technology, Harbin 150001, China
Xin He
Affiliation:
School of Mechanical and Electrical Engineering, Harbin Institute of Technology, Harbin 150001, China
*
a) Address all correspondence to these authors. e-mail: jinxuanbai@hit.edu.cn
b) e-mail: qshbai@hit.edu.cn
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Abstract

In this study, a mesoscale dislocation simulation method was developed to study the orthogonal cutting of titanium alloy. The evolution of surface grain structure and its effects on the surface mechanical properties were studied by using two-dimensional climb assisted dislocation dynamics technology. The motions of edge dislocations such as dislocation nucleation, junction, interaction with obstacles, and grain boundaries, and annihilation were tracked. The results indicated that the machined surface has a microstructure composed of refined grains. The fine-grains bring appreciable scale effect and a mass of dislocations are piled up in the grain boundaries and persistent slip bands. In particular, dislocation climb can induce a perfect softening effect, but this effect is significantly weakened when grain size is less than 1.65 μm. In addition, a Hall–Petch type relation was predicted according to the arrangement of grain, the range of grain sizes and the distribution of dislocations.

Keywords

titanium alloyplastic behaviormultiscale simulationdislocation dynamicsgrain refinement
Type
Articles
Information
Journal of Materials Research , Volume 31 , Issue 24 , 28 December 2016 , pp. 3919 - 3929
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Copyright
Copyright © Materials Research Society 2016 

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References

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