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Open AccessArticle

Hot Deformation Behavior and Pulse Current Auxiliary Isothermal Forging of Hot Pressing Sintering TiAl Based Alloys

1
School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China
2
National Key Laboratory for Precision Hot Processing of Metals, Harbin Institute of Technology, Harbin 150001, China
*
Authors to whom correspondence should be addressed.
Materials 2017, 10(12), 1437; https://doi.org/10.3390/ma10121437
Received: 20 November 2017 / Revised: 9 December 2017 / Accepted: 11 December 2017 / Published: 16 December 2017
(This article belongs to the Section Structure Analysis and Characterization)
This paper focuses on the fabrication of as-forged Ti46.5Al2Cr1.8Nb-(W, B) alloy via pulse current auxiliary isothermal forging (PCIF). The starting material composed of near gamma (NG) microstructure was fabricated by adopting pre-alloyed powders via hot pressing sintering (HPS) at 1300 °C. Isothermal compression tests were conducted at a strain rate range of 0.001–0.1 s−1 and a temperature range of 1125–1275 °C to establish the constitutive model and processing map. The optimal hot deformation parameters were successfully determined (in a strain rate range of 10−3–2.5 × 10−3 s−1 and temperature range of 1130–1180 °C) based on the hot processing map and microstructure observation. Accordingly, an as-forged TiAl based alloy without cracks was successfully fabricated by PCIF processing at 1175 °C with a nominal strain rate of 10−3 s−1. Microstructure observation indicated that complete dynamic recrystallization (DRX) and phase transformation of γ→α2 occurred during the PCIF process. The elongation of as-forged alloy was 136%, possessing a good secondary hot workability, while the sintered alloy was only 66% when tested at 900 °C with a strain rate of 2 × 10−4 s−1. View Full-Text
Keywords: TiAl based alloys; hot pressing sintering; hot deformation behavior; microstructure evolution; pulse current auxiliary isothermal forging TiAl based alloys; hot pressing sintering; hot deformation behavior; microstructure evolution; pulse current auxiliary isothermal forging
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MDPI and ACS Style

Shi, C.; Jiang, S.; Zhang, K. Hot Deformation Behavior and Pulse Current Auxiliary Isothermal Forging of Hot Pressing Sintering TiAl Based Alloys. Materials 2017, 10, 1437. https://doi.org/10.3390/ma10121437

AMA Style

Shi C, Jiang S, Zhang K. Hot Deformation Behavior and Pulse Current Auxiliary Isothermal Forging of Hot Pressing Sintering TiAl Based Alloys. Materials. 2017; 10(12):1437. https://doi.org/10.3390/ma10121437

Chicago/Turabian Style

Shi, Chengcheng; Jiang, Shaosong; Zhang, Kaifeng. 2017. "Hot Deformation Behavior and Pulse Current Auxiliary Isothermal Forging of Hot Pressing Sintering TiAl Based Alloys" Materials 10, no. 12: 1437. https://doi.org/10.3390/ma10121437

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