退火热处理对等径角挤压回收Ti-6Al-4V合金微观结构和显微硬度的影响

doi:10.11896/j.issn.1005-023X.2018.10.001

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Abstract The present study concerns the change in microstructure and micro-hardness induced by annealing treatment for Ti-6Al-4V machining chips recycled by using equal channel angular pressing (ECAP). The microstructure exploration and micro-hardness tests upon the as-recycled Ti-6Al-4V as well as the sample experienced subsequent annealing treatment were carried out. We observed that the prior chip boundaries remained in the recycled material, and the severe plastic deformation contributed to the formation of the ultrafine grained microstructure and a strong fibre-like texture. After annealing, the chip boundaries partially dissolved and the fine grains partially recrystallized. Meantime, the annealed material exhibited a weaker texture and a wider orientation distribution was found for the recrystallized grains. It is noteworthy that the micro-hardness remained essentially unchanged, even slightly increased for the recycled Ti-6Al-4V after heat treatment.

Key words： Ti-6Al-4V machining chips equal channel angular pressing ultrafine grained microstructure micro-hardness

Published: 06 July 2018

CLC number:

TG376

Corresponding Authors: Qi Shi, Ph. D., Engineer Email:shiq-1987@hotmail.com

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	SHI Qi
	Yau Yau Tse
	Rebecca Higginson
	CHEN Feng
	TAO Qiying

Cite this article:

SHI Qi,Yau Yau Tse,Rebecca Higginson, et al. Effect of Annealing Treatment on Microstructure and Micro-hardness of Equal Channel Angular Pressing Recycled Ti-6Al-4V[J]. Materials Reports, 2018, 32(10): 1577-1581.

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http://www.mater-rep.com/EN/10.11896/j.issn.1005-023X.2018.10.001 OR http://www.mater-rep.com/EN/Y2018/V32/I10/1577

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