Multi-scale Study of the Formation and Evolution of <i>M</i><sub>6</sub>C Carbides in High-Tungsten Superalloys

doi:10.1007/s40195-024-01754-5

IMR OpenIR

	Multi-scale Study of the Formation and Evolution of M₆C Carbides in High-Tungsten Superalloys
	Fei, Xiang 1,2; Sheng, Naicheng 1; Sun, Shijie 1; Fan, Shigang 1; Yu, Jinjiang 1; Hou, Guichen 1; Li, Jinguo 1; Zhou, Yizhou 1; Sun, Xiaofeng 1
通讯作者	Sheng, Naicheng(ncsheng@imr.ac.cn) ; Sun, Xiaofeng(xfsun@imr.ac.cn)
	2024-08-22
发表期刊	ACTA METALLURGICA SINICA-ENGLISH LETTERS
ISSN	1006-7191
页码	13
摘要	The formation and evolution of M6C carbides in high-W superalloy following solution treatment was investigated at different temperatures. Initially, during solid solution treatment, MC and M6C carbides was precipitated in the alloy. As the temperature increased, the morphology of M6C carbides transitioned from granular to needle-like. During the solution treatment at 1255 degrees C, the MC carbides degraded and transformed into M6C carbides, forming a symbiotic relationship between them. Nonetheless, no clear orientation relationship was observed between the two types of carbides. After further increasing the temperature to 1270 degrees C, the precipitation of needle-like M6C carbides in the dendrite arm was confirmed. This was supported by electron probe X-ray micro-analyzer and selected area electron diffraction patterns. Subsequently, a detailed examination of the three-dimensional morphology and orientation relationship of the needle-like phase with the matrix was carried out using focused-ion-beam and transmission electron microscopy techniques. The results indicated that the flat interface of the needle phase exhibited a specific orientation relationship with the matrix. However, in the three-dimensional plane, the interfaces between the needle-like phase and the matrix were not straight. Furthermore, no clear orientation relationship between the non-straight interfaces and the matrix was observed. As the solution temperature increased, the tensile properties at room temperature progressively decreased, while the stress rupture properties peaked at 1260 degrees C, suggesting that the alloy demonstrated its optimal comprehensive performance at this temperature. A subsequent analysis was conducted on the longitudinal section of the fracture using electron backscattered diffraction. The results showed a noticeable concentration of stress at the interface between MC and M6C carbides, which ultimately led to crack initiation at this interface. In addition, as the solid solution temperature increased, the quantity of symbiotic phases also increased. This phenomenon led to the initiation of cracks at multiple locations, which then propagated and interconnected. As a consequence, the tensile properties and stress rupture life of the alloy progressively deteriorated.
关键词	Superalloys Tungsten Solution treatment Carbides Mechanical properties
资助者	National Key Research and Development Program of China ; National Natural Science Foundation of China ; Liaoning Provincial Natural Science Foundation
DOI	10.1007/s40195-024-01754-5
收录类别	SCI
语种	英语
资助项目	National Key Research and Development Program of China[2022YFB3705000] ; National Natural Science Foundation of China[52303394] ; Liaoning Provincial Natural Science Foundation[2023-BS-015]
WOS研究方向	Metallurgy & Metallurgical Engineering
WOS类目	Metallurgy & Metallurgical Engineering
WOS记录号	WOS:001296523300004
出版者	CHINESE ACAD SCIENCES, INST METAL RESEARCH
引用统计
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/189169
专题	中国科学院金属研究所
通讯作者	Sheng, Naicheng; Sun, Xiaofeng
作者单位	1.Chinese Acad Sci, Inst Met Res, Shi Changxu Innovat Ctr Adv Mat, Shenyang 110016, Peoples R China 2.Univ Sci & Technol China, Sch Mat Sci & Engn, Shenyang 110016, Peoples R China
推荐引用方式 GB/T 7714	Fei, Xiang,Sheng, Naicheng,Sun, Shijie,et al. Multi-scale Study of the Formation and Evolution of M₆C Carbides in High-Tungsten Superalloys[J]. ACTA METALLURGICA SINICA-ENGLISH LETTERS,2024:13.
APA	Fei, Xiang.,Sheng, Naicheng.,Sun, Shijie.,Fan, Shigang.,Yu, Jinjiang.,...&Sun, Xiaofeng.(2024).Multi-scale Study of the Formation and Evolution of M₆C Carbides in High-Tungsten Superalloys.ACTA METALLURGICA SINICA-ENGLISH LETTERS,13.
MLA	Fei, Xiang,et al."Multi-scale Study of the Formation and Evolution of M₆C Carbides in High-Tungsten Superalloys".ACTA METALLURGICA SINICA-ENGLISH LETTERS (2024):13.