Effect of annealing temperature on recrystallization behaviors of cold-rolled high-purity CVD tungsten

doi:10.13251/j.issn.0254-6051.2021.03.007

Abstract

Abstract: Recrystallization behavior of chemical vapor deposited high purity tungsten after cold-rolling was studied by using annealing experiments at different temperatures. The results show that layered heterostructure is formed in the cold-rolled tungsten, which improves the strain hardening rate of the material, thereby improving the plasticity. After cold rolling, the ductile-brittle transition temperature is reduced to below 200 ℃, and the hardness is increased from 402 HV0.2 in deposited state to 547 HV0.2. After high temperature annealing, the cold-rolled tungsten recrystallizes at 1100 ℃, and the recrystallization temperature is reduced by 880 ℃ compared with the deposited tungsten. This is because the storage energy of the material is increased due to low-temperature plastic deformation, and the recrystallization driving force is increased, so the recrystallization temperature decreases. As the annealing temperature increases, the layered heterostructure gradually disappears due to the increase of grain size, the hardness rapidly decreases to 370 HV0.2 in the fully recrystallized state, and the yield strength gradually decreases from 1224 MPa in the cold-rolled state to 558 MPa after annealing at 1800 ℃, but the ductile-brittle transition temperature remains below 200 ℃.

Key words: chemical vapor deposition(CVD), cold-rolled tungsten, recrystallization, ductile-brittle transition temperature

CLC Number:

TG166.7

Tan Xiao, Hao Yupeng, Yu Xiaodong, Wang Yutian, Tan Chengwen, Hu Jin. Effect of annealing temperature on recrystallization behaviors of cold-rolled high-purity CVD tungsten[J]. Heat Treatment of Metals, 2021, 46(3): 33-38.

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