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Effect of Cr addition on microstructure and welding solidification cracking susceptibility of Co-Al-W based superalloys
Liu, Caiyun1,2; Sun, Yuan1; Wen, Mingyue1,2; He, Tong3; Yu, Jinjiang1
Corresponding AuthorSun, Yuan(yuansun@imr.ac.cn) ; Yu, Jinjiang(yuansun@imr.ac.cn)
2020-08-01
Source PublicationJOURNAL OF MANUFACTURING PROCESSES
ISSN1526-6125
Volume56Pages:820-829
AbstractThe 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.
KeywordCobalt-base superalloys M6C carbides Welding solidification cracking susceptibility Solidification temperature range Serrated grain boundary Solidification sub-grain boundary
Funding OrganizationNational Natural Science Foundation of China (NSFC) ; Aeronautics Power Foundation of China
DOI10.1016/j.jmapro.2020.03.049
Indexed BySCI
Language英语
Funding ProjectNational Natural Science Foundation of China (NSFC)[51971214] ; National Natural Science Foundation of China (NSFC)[51771191] ; Aeronautics Power Foundation of China[DLJJ1825]
WOS Research AreaEngineering
WOS SubjectEngineering, Manufacturing
WOS IDWOS:000558319600002
PublisherELSEVIER SCI LTD
Citation statistics
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/140232
Collection中国科学院金属研究所
Corresponding AuthorSun, Yuan; Yu, Jinjiang
Affiliation1.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
Recommended Citation
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.
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