Study on the precipitates formed by Double Glow Plasma Surface Alloying with tungsten-molybdenum

J Mater Sci Technol ›› 2001, Vol. 17 ›› Issue (S1): 111-114.

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Study on the precipitates formed by Double Glow Plasma Surface Alloying with tungsten-molybdenum

Bin ZHAO, Jiansheng WU, Zhonghou LI, Xiaoping LIU, Zhong XU

Key Laboratory of the Ministry of Education for High Temperature Materials and Tests, School of Materials Science and Engineering, Shanghai Jiaotong Univ., Shanghai 200030, China...

Received:2000-09-08 Revised:2000-12-04 Online:2001-10-28 Published:2009-10-10
Contact: Bin ZHAO

Abstract

Abstract: Due to the slow cooling rate in the alloying furnace, large amount of brittle precipitates appear in the alloyed layers which are formed by the DGPSA (Double Glow Plasma Surface Alloying) with tungsten-molybdenum. It causes the mechanical properties of the samples to be seriously degraded. Qualitative phase analysis reveals that they are mainly composed of the p-phase, and a small amount of carbide, M6C. In this paper the microstructure and thermodynamic factors of the precipitates are exhaustively investigated. There are two transformation noses in the isothermal transformation (IT) diagram of the precipitates. As a major object of this work, an effective measure is offered to depress the deposition of the precipitates.

Key words:

Bin ZHAO, Jiansheng WU, Zhonghou LI, Xiaoping LIU, Zhong XU. Study on the precipitates formed by Double Glow Plasma Surface Alloying with tungsten-molybdenum[J]. J Mater Sci Technol, 2001, 17(S1): 111-114.

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Study on the precipitates formed by Double Glow Plasma Surface Alloying with tungsten-molybdenum

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