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Effect of Cr addition on microstructure and welding solidification cracking susceptibility of Co-Al-W based superalloys

文献类型：期刊论文

作者Liu, Caiyun2,3; Sun, Yuan3; Wen, Mingyue2,3; He, Tong1; Yu, Jinjiang3
刊名JOURNAL OF MANUFACTURING PROCESSES
出版日期2020-08-01
卷号56页码:820-829
关键词Cobalt-base superalloys M6C carbides Welding solidification cracking susceptibility Solidification temperature range Serrated grain boundary Solidification sub-grain boundary
ISSN号1526-6125
DOI10.1016/j.jmapro.2020.03.049
通讯作者Sun, Yuan(yuansun@imr.ac.cn) ; Yu, Jinjiang(yuansun@imr.ac.cn)
英文摘要The novel gamma'-strengthened cobalt-base superalloys are promising candidates for high temperature materials. However, the weldability has rarely been studied. In this work, the effect of Cr addition on microstructure and solidification cracking susceptibility during tungsten inert gas welding of the Co-Al-W-xCr-0.5C (where x = 2.5, 5 and 7.5 at%, named as 2.5Cr, 5Cr and 7.5Cr) alloys were investigated. Results show that there are M6C carbide, beta phase and gamma/gamma' phase existed in all alloys. Cr addition promotes the precipitation of M6C carbides and changes the morphology of gamma' phases from cubic to round-cornered, which is due to the occupied lattice of W atoms by Cr atoms. In addition, the welding solidification cracks length declines significantly with increasing Cr content. Further studies by differential thermal analysis and electron back scattering diffraction show that the relative low solidification cracking susceptibility of 7.5Cr is mainly attributed to the narrow solidification temperature range, sufficient liquid phases backfilling the grain boundary in partially melted zone, serrated grain boundaries and large numbers of solidification sub-grain boundaries.
资助项目National Natural Science Foundation of China (NSFC)[51971214] ; National Natural Science Foundation of China (NSFC)[51771191] ; Aeronautics Power Foundation of China[DLJJ1825]
WOS研究方向Engineering
语种英语
WOS记录号WOS:000558319600002
出版者ELSEVIER SCI LTD
资助机构National Natural Science Foundation of China (NSFC) ; Aeronautics Power Foundation of China
源URL[http://ir.imr.ac.cn/handle/321006/140228]  
专题金属研究所_中国科学院金属研究所
通讯作者Sun, Yuan; Yu, Jinjiang
作者单位1.Northeastern Univ, Res Acad, Shenyang 110004, Peoples R China
2.Univ Sci & Technol China, Sch Mat Sci & Engn, Hefei 230026, Peoples R China
3.Chinese Acad Sci, Inst Met Res, Superalloys Div, Shenyang 110016, Peoples R China
推荐引用方式
GB/T 7714		 Liu, Caiyun,Sun, Yuan,Wen, Mingyue,et al. Effect of Cr addition on microstructure and welding solidification cracking susceptibility of Co-Al-W based superalloys[J]. JOURNAL OF MANUFACTURING PROCESSES,2020,56:820-829.
APA Liu, Caiyun,Sun, Yuan,Wen, Mingyue,He, Tong,&Yu, Jinjiang.(2020).Effect of Cr addition on microstructure and welding solidification cracking susceptibility of Co-Al-W based superalloys.JOURNAL OF MANUFACTURING PROCESSES,56,820-829.
MLA Liu, Caiyun,et al."Effect of Cr addition on microstructure and welding solidification cracking susceptibility of Co-Al-W based superalloys".JOURNAL OF MANUFACTURING PROCESSES 56(2020):820-829.

入库方式： OAI收割

来源：金属研究所

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