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| 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 | |
| Source Publication | MATERIALS & DESIGN
 |
| ISSN | 0261-3069 |
| Volume | 93Issue:-Pages:324—333 |
| Subtype | 期刊文献 |
| Abstract | 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. |
| Keyword | Heat-affected Zone Discontinuous Precipitation Liquation Cracking Inconel 718 Microstructure Temperature Alloy Reactors Carbide Silicon |
| DOI | 10.1016/j.matdes.2015.12.152 |
| Indexed By | SCI |
| Language | 英语 |
| WOS ID | WOS:000369587500036 |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.sinap.ac.cn/handle/331007/25866 |
| Collection | 中科院上海应用物理研究所2011-2018年 |
| Corresponding Author | Long, Y; Li, ZJ (reprint author), Chinese Acad Sci, Shanghai Inst Appl Phys, Thorium Molten Salts Reactor Ctr, Shanghai 201800, Peoples R China. |
| Recommended Citation 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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| The formation of eut（2974KB） | 期刊论文 | 作者接受稿 | 开放获取 | CC BY-NC-SA | View Download | |
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