The formation of eutectic phases and hot cracks in one Ni-Mo-Cr superalloy

doi:10.1016/j.matdes.2015.12.152

CAS OpenIR > 中科院上海应用物理研究所2011-2018年

	The formation of eutectic phases and hot cracks in one Ni-Mo-Cr superalloy
	Li, J; Shrestha, SL; Long, Y; Li, ZJ; Zhou, XT; Li, ZJ (reprint author), Chinese Acad Sci, Shanghai Inst Appl Phys, Thorium Molten Salts Reactor Ctr, Shanghai 201800, Peoples R China.
	2016
发表期刊	MATERIALS & DESIGN
ISSN	0261-3069
卷号	93 期号:-页码:324—333
文章类型	期刊文献
摘要	The structure and the formationmechanism of brittle eutectic phases and hot cracks formed at grain boundaries were investigated in two Ni-Mo-Cr superalloys with different silicon contents (0.06 and 0.46 wt.%). The eutectic phases and hot cracks can be observed along the rolling direction in the 0.46 wt.% Si heat when heated to 1335 degrees C or a higher peak temperature up to 1365 degrees C. Exposure to the higher peak temperatures resulted in the formation of larger eutectic phases and hot cracks in the higher silicon heat. Conversely, there are fewer eutectic phases and smaller hot cracks forming in the low-silicon heat when heated to 1365 degrees C. The eutectic phases were identified as gamma-M6C' type. Based on the constitutional liquation theory and thermodynamic calculations, it was found that the formation of the eutectic phases and hot cracks is due to the localized melting of primary M6C carbides and surrounding Si-riched matrix. The degree of elements segregation in liquid films determines whether liquid films solidify into eutectic phases or cause hot cracks. This model can reasonably explain the observed phenomena and contribute to designing appropriate solid-solution treatment process and welding procedure to avoid brittle phases and cracks in the Ni-Mo-Cr superalloy. (C) 2015 Elsevier Ltd. All rights reserved.
关键词	Heat-affected Zone Discontinuous Precipitation Liquation Cracking Inconel 718 Microstructure Temperature Alloy Reactors Carbide Silicon
DOI	10.1016/j.matdes.2015.12.152
收录类别	SCI
语种	英语
WOS记录号	WOS:000369587500036
引用统计	被引频次：10[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.sinap.ac.cn/handle/331007/25866
专题	中科院上海应用物理研究所2011-2018年
通讯作者	Long, Y; Li, ZJ (reprint author), Chinese Acad Sci, Shanghai Inst Appl Phys, Thorium Molten Salts Reactor Ctr, Shanghai 201800, Peoples R China.
推荐引用方式 GB/T 7714	Li, J,Shrestha, SL,Long, Y,et al. The formation of eutectic phases and hot cracks in one Ni-Mo-Cr superalloy[J]. MATERIALS & DESIGN,2016,93(-):324—333.
APA	Li, J,Shrestha, SL,Long, Y,Li, ZJ,Zhou, XT,&Li, ZJ .(2016).The formation of eutectic phases and hot cracks in one Ni-Mo-Cr superalloy.MATERIALS & DESIGN,93(-),324—333.
MLA	Li, J,et al."The formation of eutectic phases and hot cracks in one Ni-Mo-Cr superalloy".MATERIALS & DESIGN 93.-(2016):324—333.

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