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

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.

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ACKNOWLEDGMENTS

This research work was jointly supported by the National Natural Science Foundation of China (Grant No. 51575138) and the State Key Program of National Natural Science Foundation of China (Grant No. 51535003).

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Correspondence to Jinxuan Bai or Qingshun Bai.

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Bai, J., Bai, Q., Tong, Z. et al. Evolution of surface grain structure and mechanical properties in orthogonal cutting of titanium alloy. Journal of Materials Research 31, 3919–3929 (2016). https://doi.org/10.1557/jmr.2016.444

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