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

doi:10.1016/j.jmapro.2020.03.049

CORC > 金属研究所 > 中国科学院金属研究所

	Effect of Cr addition on microstructure and welding solidification cracking susceptibility of Co-Al-W based superalloys
	Liu, Caiyun 1,3; Sun, Yuan 1; Wen, Mingyue 1,3; He, Tong 2; Yu, Jinjiang 1
刊名	JOURNAL OF MANUFACTURING PROCESSES
	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
DOI	10.1016/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
出版者	ELSEVIER SCI LTD
WOS记录号	WOS:000558319600002
资助机构	National Natural Science Foundation of China (NSFC) ; Aeronautics Power Foundation of China
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/140231]
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.Chinese Acad Sci, Inst Met Res, Superalloys Div, Shenyang 110016, Peoples R China 2.Northeastern Univ, Res Acad, Shenyang 110004, Peoples R China 3.Univ Sci & Technol China, Sch Mat Sci & Engn, Hefei 230026, 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.