| Weldability and Microstructure of Nickel-Silicon Based Alloys |
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| 作者姓名： | LIU Qing-cai LIU Yi YANG Jian J. W. Newkirk ZHANG Shan-hong |
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| 作者单位： | [1]State Key Laboratory of Mechanical Transmissions, Chongqing University, Chongqing 400044, China [2]Department of Metallurgical Engineering, University of Missouri-Rolla, Rolla, MO 65401, USA [3]Yuanda Environmental Protection Co Ltd, Chorgqing 400060, China |
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| 基金项目： | Item Sponsored by State Key Lab of Mechanical Transmissions, Chongqing University |
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| 摘 要： | The NiSix based alloy typically has poor weldability due to its lower ductility. A limited amount of work has been performed on the weldability of NiSix based alloys. Therefore, the effect of heat treatment and welding parameters on weldability of the alloys, and the relationship between the weldability and microstructure were studied. The results show that the as-cast Ni-Si-Nb-B alloy （Ni 76. 5%, Si 20%, Nb 3%, and B 0. 5%） could be successfully welded after preheating at 600 ℃. The welding procedure should be performed on the alloys before any heat treatment and a preheating at 600 ℃ should be used. The fusion zone is harder than the matrix due to a large amount of 7 phase and a finer microstructure. The cracks are predominantly intergranular in heat affected zone and associated with the needle-like ）, phase. The heat treatment before welding increases the tendency of cracking in the fusion zone.
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| 关 键 词： | Ni3Si 镍基合金 焊接性 显微结构 热处理 热影响区 |
| 修稿时间： | 2005-01-03 |
Weldability and Microstructure of Nickel-Silicon Based Alloys |
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| LIU Qing-cai LIU Yi YANG Jian J. W. Newkirk ZHANG Shan-hong.Weldability and Microstructure of Nickel-Silicon Based Alloys[J].Journal of Iron and Steel Research,2006,13(3):61-67. |
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| Authors: | LIU Qing-cai LIU Yi YANG Jian JWNewkirk ZHANG Shan-hong |
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| Affiliation: | 1. State Key Laboratory of Mechanical Transmissions, Chongqing University, Chongqing 400044, China;2. Department of Metallurgical Engineering, University of Missouri-Rolla, Rolla, MO 65401, USA;3. Yuanda Environmental Protection Co Ltd, Chorgqing 400060, China;1. International Advanced Research Centre for Powder Metallurgy and New Materials, Balapur Post, Hyderabad-500005, Telangana, India;2. Department of Metallurgical and Materials Engineering, Indian Institute of Technology Kharagpur, Kharagpur, West Bengal, 721302, India;1. Centre des Matériaux, Mines Paris – ParisTech, UMR CNRS 7633, BP87 F-91003 Evry, France;2. Laboratoire de Mécanique des Solides, CNRS URA 317, Ecole Polytechnique, 91128 Palaiseau Cedex, France;3. PSA Peugeot Citroën, Route de Gisy, 78943 Vélizy-Villacoublay Cedex, France;1. Department of Materials Science and Engineering, National Tsing Hua University, 101, Sec. 2, Kuang-Fu Road, Hsinchu 30013, Taiwan, ROC;2. Department of Mechanical and Automation Engineering, I-Shou University, 1, Sec. 1, Syuecheng Rd., Dashu, Kaohsiung 84001, Taiwan, ROC;1. College of Materials Science and Engineering, North University of China, Taiyuan, Shanxi 030051, People''s Republic of China;2. State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi''an, Shaanxi 710072, People''s Republic of China;1. UES Inc., 4401 Dayton-Xenia Rd, Dayton, OH 45432, United States;2. University of Dayton Research Institute, 300 College Park, 45469 United States;3. Air Force Research Laboratory, AFRL/RXCM, WPAFB, OH 45433, United States |
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| Abstract: | The NiSix based alloy typically has poor weldability due to its lower ductility. A limited amount of work has been performed on the weldability of NiSix based alloys. Therefore, the effect of heat treatment and welding parameters on weldability of the alloys, and the relationship between the weldability and microstructure were studied. The results show that the as-cast Ni-Si-Nb-B alloy (Ni 76.5%, Si 20%, Nb 3%, and B 0.5%) could be successfully welded after preheating at 600 ℃. The welding procedure should be performed on the alloys before any heat treatment and a preheating at 600 ℃ should be used. The fusion zone is harder than the matrix due to a large amount of γ phase and a finer microstructure. The cracks are predominantly intergranular in heat affected zone and associated with the needle-like γ phase. The heat treatment before welding increases the tendency of cracking in the fusion zone. |
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| Keywords: | weldability Ni3Si based alloy heat treatment heat affected zone |
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