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题名:
The formation of eutectic phases and hot cracks in one Ni-Mo-Cr superalloy
作者: Li, J; Shrestha, SL; Long, Y; Li, ZJ; Zhou, XT
刊名: MATERIALS & DESIGN
出版日期: 2016
卷号: 93, 期号:-, 页码:324—333
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
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.
文章类型: 期刊文献
英文摘要: 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.
收录类别: SCI
语种: 英语
WOS记录号: WOS:000369587500036
ISSN号: 0261-3069
Citation statistics:
内容类型: 期刊论文
URI标识: http://ir.sinap.ac.cn/handle/331007/25866
Appears in Collections:中科院上海应用物理研究所2011-2017年_期刊论文

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Recommended Citation:
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,2016-01-01,93(-):324—333.
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