Microstructure and properties of Ti-17 powder compact prepared through powder sintering and isothermal forging

Autor: H.Z. Guo, Yao Zekun, Zhanglong Zhao
Rok vydání: 2012
Předmět:
Zdroj: Powder Metallurgy. 55:368-373
ISSN: 1743-2901
0032-5899
DOI: 10.1179/1743290112y.0000000002
Popis: Powder sintering and dual isothermal forging were utilised to prepare titanium alloy. Owing to the disturbance effect of residual pores during sintering, the microstructures of two sintered Ti-17 powder compacts prepared with about 80–150 and −150 mesh powders were composed of large residual pores and low aspect ratio of α platelets and small residual pores and high aspect ratio of α platelets respectively. Residual pores can be closed during the first isothermal forging above the β transus due to the excellent plastic deformation capability of the β phase. The microstructure can be effectively broken during the second isothermal forging below the β transus. Isothermal forging with 10−2 and 10−4 s−1 strain rates can obtain uniform microstructure, whereas isothermal forging with 1 s−1 strain rate just refined the microstructure non-uniformly. Closure of the residual pore and change of the microstructure’s morphology during dual isothermal forging effectively improved the ductility of the compact even thoug...
Databáze: OpenAIRE
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