Effects of Homogenization Treatment on the Microsegregation of a Ni-Co Based Superalloy Produced by Directional Solidification

doi:10.1007/s40195-021-01192-7

IMR OpenIR

	Effects of Homogenization Treatment on the Microsegregation of a Ni-Co Based Superalloy Produced by Directional Solidification
	Zhou, Zijian 1,2; Zhang, Rui 1; Cui, Chuanyong 1; Zhou, Yizhou 1; Sun, Xiaofeng 1
通讯作者	Zhang, Rui(rzhang@imr.ac.cn) ; Cui, Chuanyong(chycui@imr.ac.cn)
	2021-02-05
发表期刊	ACTA METALLURGICA SINICA-ENGLISH LETTERS
ISSN	1006-7191
页码	12
摘要	To reduce microsegregation, a series of homogenization treatments were carried out on a Ni-Co based superalloy prepared through directional solidification (DS). The element segregation characteristics and microstructural evolution were investigated by optical microscopy (OM), scanning electron microscopy (SEM), and electron probe microanalysis (EPMA). The results show that the elements are non-uniformly distributed in the solidified superalloy, in which W and Ti have the greatest tendency of microsegregation. Furthermore, severe microsegregation leads to complicated precipitations, including eta-Ni3Ti and eutectic (gamma + gamma '). EPMA results show that Al and Mo are uniformly distributed between the eutectic (gamma + gamma ') and gamma matrix, whereas Ti is segregated in the eutectic (gamma + gamma ') and eta phases. The positive segregation element Ti, which is continuously rejected into the remaining liquid during gamma matrix solidification, promotes the formation of eutectic (gamma + gamma ') and the transformation of the eta phase. According to the homogenization effect, the optimal single-stage homogenization process of this alloy is 1180 degrees C for 2 h because of the sufficient diffusion segregation of the elements. In the present study, a kinetic diffusion model was built to reflect the degree of element segregation during homogenization, and the diffusion coefficients of W and Ti were estimated.
关键词	Ni– Co based superalloy Element segregation Homogenization Diffusion kinetics
资助者	National Key R&D Program of China ; National Natural Science Foundation of China ; Innovation Program of Institute of Metal Research, China Academy of Science ; Doctoral Scientific Research Foundation of Liaoning Province
DOI	10.1007/s40195-021-01192-7
收录类别	SCI
语种	英语
资助项目	National Key R&D Program of China[2019YFA0705304] ; National Key R&D Program of China[2017YFA0700703] ; National Natural Science Foundation of China[51671189] ; Innovation Program of Institute of Metal Research, China Academy of Science ; Doctoral Scientific Research Foundation of Liaoning Province[2020-BS-007]
WOS研究方向	Metallurgy & Metallurgical Engineering
WOS类目	Metallurgy & Metallurgical Engineering
WOS记录号	WOS:000615154200003
出版者	CHINESE ACAD SCIENCES, INST METAL RESEARCH
引用统计	被引频次：24[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/159169
专题	中国科学院金属研究所
通讯作者	Zhang, Rui; Cui, Chuanyong
作者单位	1.Chinese Acad Sci, Shi Changxu Innovat Ctr Adv Mat, Inst Met Res, 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	Zhou, Zijian,Zhang, Rui,Cui, Chuanyong,et al. Effects of Homogenization Treatment on the Microsegregation of a Ni-Co Based Superalloy Produced by Directional Solidification[J]. ACTA METALLURGICA SINICA-ENGLISH LETTERS,2021:12.
APA	Zhou, Zijian,Zhang, Rui,Cui, Chuanyong,Zhou, Yizhou,&Sun, Xiaofeng.(2021).Effects of Homogenization Treatment on the Microsegregation of a Ni-Co Based Superalloy Produced by Directional Solidification.ACTA METALLURGICA SINICA-ENGLISH LETTERS,12.
MLA	Zhou, Zijian,et al."Effects of Homogenization Treatment on the Microsegregation of a Ni-Co Based Superalloy Produced by Directional Solidification".ACTA METALLURGICA SINICA-ENGLISH LETTERS (2021):12.