Primary MC decomposition and its effects on the rupture behaviors in hot-corrosion resistant Ni-based superalloy K444

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	Primary MC decomposition and its effects on the rupture behaviors in hot-corrosion resistant Ni-based superalloy K444
	J. Wang; L. Z. Zhou; X. Z. Qin; L. S. Sheng; J. S. Hou; J. T. Guo
	2012
发表期刊	Materials Science and Engineering a-Structural Materials Properties Microstructure and Processing
ISSN	0921-5093
卷号	553 页码:14-21
摘要	The mechanism of primary MC decomposition and its influence on the rupture behaviors in the hot-corrosion resistant superalloy K444 are investigated by the combination of scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The results reveal that the blocky primary MC mainly distributes at interdendritic regions and grain boundaries after the standard heat treatment. During long-term thermal exposure, primary MC decomposes gradually, which can be summarized into three stages. Firstly, the primary MC reacts with the gamma matrix and produces the M23C6 particles and gamma' film, which can be described as MC + gamma -> M23C6 + gamma'. In the second stage, the un-decomposed primary MC arrests the Ni element and forms the M6C particles and eta phase, which can be expressed as MC + gamma -> M6C + eta. In the third stage, the remaining primary MC reacts with the diffused Ni element and forms the eta phase with M6C and M23C6 particles inside, which can be described as MC + gamma -> M6C + M23C6 + eta. The reaction of the second and third stages should be ascribed to the high (Ti + Nb + Hf)/Al ratio and segregated W, Mo and Cr element in the decomposed region. In addition, the platelet-like sigma phase is found in the third stage. The primary MC decomposition has different effects on the rupture behaviors between tensile and stress-rupture test. (C) 2012 Elsevier B.V. All rights reserved.
部门归属	[wang, jian; zhou, lanzhang; qin, xuezhi; hou, jieshan; guo, jianting] chinese acad sci, inst met res, shenyang 110016, peoples r china. [sheng, liyuan] peking univ, coll engn, beijing 100871, peoples r china. [sheng, liyuan] pku hkust, shenzhen hongkong inst, shenzhen 518057, peoples r china.;zhou, lz (reprint author), chinese acad sci, inst met res, shenyang 110016, peoples r china.;lzz@imr.ac.cn
关键词	Hot-corrosion Resistant Ni-based Superalloy K444 Thermal Exposure Primary Mc Decomposition Rupture Behavior Term Thermal Exposure Microstructure Evolution Compressive Properties Turbine-blades Eta-phase Precipitation Alloy Creep Co Rejuvenation
URL	查看原文
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/60290
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	J. Wang,L. Z. Zhou,X. Z. Qin,et al. Primary MC decomposition and its effects on the rupture behaviors in hot-corrosion resistant Ni-based superalloy K444[J]. Materials Science and Engineering a-Structural Materials Properties Microstructure and Processing,2012,553:14-21.
APA	J. Wang,L. Z. Zhou,X. Z. Qin,L. S. Sheng,J. S. Hou,&J. T. Guo.(2012).Primary MC decomposition and its effects on the rupture behaviors in hot-corrosion resistant Ni-based superalloy K444.Materials Science and Engineering a-Structural Materials Properties Microstructure and Processing,553,14-21.
MLA	J. Wang,et al."Primary MC decomposition and its effects on the rupture behaviors in hot-corrosion resistant Ni-based superalloy K444".Materials Science and Engineering a-Structural Materials Properties Microstructure and Processing 553(2012):14-21.