Control of precipitation behaviour of Hastelloy-X through grain boundary engineering

被引：20

作者：

Wang, Xiaoyan ^{[1
]}

Kurosawa, Kentaro ^{[2
]}

Huang, Ming ^{[1
]}

Lu, Xianke ^{[1
]}

Zhang, Dao ^{[1
]}

Kokawa, Hiroyuki ^{[2
]}

Yan, Yinbiao ^{[1
]}

Yang, Sen ^{[1
]}

机构：

[1] Nanjing Univ Sci & Technol, Sch Mat Sci & Engn, 200 Xiaolingwei, Nanjing 210094, Jiangsu, Peoples R China

[2] Tohoku Univ, Grad Sch Engn, Dept Mat Proc, Sendai, Miyagi, Japan

来源：

MATERIALS SCIENCE AND TECHNOLOGY | 2017年 / 33卷 / 17期

基金：

中国国家自然科学基金;

关键词：

Nickel-based superalloy; aging; precipitation; Mo enrichment; grain boundary character distribution; thermal stability; SINGLE-CRYSTAL SUPERALLOY; LAVES-PHASE; FERRITIC STEELS; MICROSTRUCTURAL EVOLUTION; CHARACTER-DISTRIBUTION; CRACKING BEHAVIOR; THERMAL-STABILITY; ALLOY-X; CREEP; CORROSION;

D O I：

10.1080/02670836.2017.1345823

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Grain boundary engineering (GBE) was employed to control the precipitation behaviour of Hastelloy-X alloy. The precipitate characteristics and thermal stability of grain boundary character distribution (GBCD) were investigated by aging at 850 degrees C. M6C carbides and mu phases were observed in the matrix and on grain boundaries, respectively. It revealed that the formation of mu phase was closely related to the grain boundary structure. GBCD effectively suppressed the nucleation and coarsening of mu phases on the grain boundaries. Owing to the Mo depletion in the vicinity of random grain boundary, the formation of the precipitates was inhibited on the adjacent grain boundaries. The thermal stability of the GBE-optimised microstructure was confirmed at 850 degrees C for 720 h without significant microstructural degradation.

引用

页码：2078 / 2085

页数：8

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