Microstructure evolution of cobalt aluminide coating on nickel-based superalloys during exposure at 1050 °C

被引：11

作者：

Ren, Weipeng ^{[1
]}

Xiao, Chengbo ^{[1
]}

Li, Qing ^{[1
]}

Song, Jinxia ^{[1
]}

He, Limin ^{[2
]}

Cao, Chunxiao ^{[1
]}

机构：

[1] Beijing Inst Aeronaut Mat, Sci & Technol Adv High Temp Struct Mat Lab, Beijing 100095, Peoples R China

[2] Beijing Inst Aeronaut Mat, Dept 5, Beijing 100095, Peoples R China

来源：

VACUUM | 2014年 / 106卷

基金：

国家高技术研究发展计划(863计划);

关键词：

Microstructure evolution; Aluminide coating; Exposure; Interdiffusion; Precipitate; CYCLIC-OXIDATION BEHAVIOR; CMSX-4; SUPERALLOY; NIAL COATINGS; BOND COAT; INTERDIFFUSION; DEGRADATION; DEPOSITION; SERVICE;

D O I：

10.1016/j.vacuum.2014.03.013

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Cobalt aluminide coating was deposited onto two directionally solidified Ni-based superalloys (DZ 466 and DS GTD111) by low-pressure chemical vapor deposition. Interdiffusion behaviors of the two coating/superalloy systems were examined during long-term thermal exposure at 1050 degrees C. It was observed that the inward diffusion of Al and Co from the coating to the substrate and the outward diffusion of Ni and refractory elements such as W, Ta and Cr etc. from the substrate occurred during annealing. This phenomenon induced the degradation of coating matrix and several precipitations of chromium containing phases. Degradation rate and precipitate categories are of great differences for the two studied superalloys. The initial precipitates presented in the coating system had a morphological heredity-effect (MHE) to the final Upsilon phase microstructure. Mechanism referred to elements distribution was discussed. (C) 2014 Elsevier Ltd. All rights reserved.

引用

页码：39 / 45

页数：7

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