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

IMR OpenIR

	Effect of Cr addition on microstructure and welding solidification cracking susceptibility of Co-Al-W based superalloys
	Liu, Caiyun 1,2; Sun, Yuan 1; Wen, Mingyue 1,2; He, Tong 3; Yu, Jinjiang 1
通讯作者	Sun, Yuan(yuansun@imr.ac.cn) ; Yu, Jinjiang(yuansun@imr.ac.cn)
	2020-08-01
发表期刊	JOURNAL OF MANUFACTURING PROCESSES
ISSN	1526-6125
卷号	56 页码:820-829
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.
关键词	Cobalt-base superalloys M6C carbides Welding solidification cracking susceptibility Solidification temperature range Serrated grain boundary Solidification sub-grain boundary
资助者	National Natural Science Foundation of China (NSFC) ; Aeronautics Power Foundation of China
DOI	10.1016/j.jmapro.2020.03.049
收录类别	SCI
语种	英语
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
WOS类目	Engineering, Manufacturing
WOS记录号	WOS:000558319600002
出版者	ELSEVIER SCI LTD
引用统计	被引频次：12[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/321006/140232
专题	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.Univ Sci & Technol China, Sch Mat Sci & Engn, Hefei 230026, Peoples R China 3.Northeastern Univ, Res Acad, Shenyang 110004, 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.