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

文献类型：期刊论文

作者Zhou, Zijian1,2; Zhang, Rui1; Cui, Chuanyong1; Zhou, Yizhou1; Sun, Xiaofeng1
刊名ACTA METALLURGICA SINICA-ENGLISH LETTERS
出版日期2021-02-05
页码12
关键词Ni– Co based superalloy Element segregation Homogenization Diffusion kinetics
ISSN号1006-7191
DOI10.1007/s40195-021-01192-7
通讯作者Zhang, Rui(rzhang@imr.ac.cn) ; Cui, Chuanyong(chycui@imr.ac.cn)
英文摘要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.
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
语种英语
WOS记录号WOS:000615154200003
出版者CHINESE ACAD SCIENCES, INST METAL RESEARCH
资助机构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
源URL[http://ir.imr.ac.cn/handle/321006/159168]  
专题金属研究所_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.

入库方式： OAI收割

来源：金属研究所

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