Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5455930 | Materials Science and Engineering: A | 2017 | 5 Pages |
Abstract
Intense thermo-mechanical loads can destroy the classical Burgers orientation relationship (OR) between α-Ti and β-Ti during the phase transformation of α-Ti to β-Ti. This paper seeks to investigate the effect of local stress on the OR variation of α-Ti and β-Ti during high speed machining (HSM) of Ti-6Al-4V. Firstly, phase transformation of α-Ti to β-Ti with the OR variation from (0001)α//(110)β, [11-20]α//[1-11]β to (01-10)α//(110)β, [0001]α//[111]β is observed during HSM of Ti-6Al-4V. Secondly, the stress distributions in the machining primary deformation zone are analyzed via finite element method. Combined loads of constant shear stress and compressive/tensile stress are imposed on the material. At last, a phase transformation model with considering the stress state is proposed to describe the relationship between the OR variation and the stress state during HSM. The OR variation is elucidated by a compressive/shear and tensile/shear stress state. The stress-induced OR variation provides a new perspective for understanding the transformation process of α-Ti to β-Ti during HSM Ti-6Al-4V, in which a shear martensitic transformation is generated. It also proves that the OR variation between α-Ti and β-Ti is favor for the subsequent rapid cooling phase transformation.
Keywords
Related Topics
Physical Sciences and Engineering
Materials Science
Materials Science (General)
Authors
Qingqing Wang, Zhanqiang Liu, Bing Wang, Aziz Ul Hassan Mohsan,