Solidification microstructure formation in HK40 and HH40 alloys

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• 作者：Xian-fei Ding ; Dong-fang Liu ; Pei-liang Guo…
• 关键词：iron chromium nickel alloys ; solidification ; phase transitions ; carbides
• 刊名：International Journal of Minerals, Metallurgy, and Materials
• 出版年：2016
• 出版时间：April 2016
• 年：2016
• 卷：23
• 期：4
• 页码：442-448
• 全文大小：1,981 KB
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• 作者单位：Xian-fei Ding (1) (2)
  Dong-fang Liu (3) (4)
  Pei-liang Guo (1)
  Yun-rong Zheng (3)
  Qiang Feng (2) (3)
  
  1. National Center for Materials Service Safety, University of Science and Technology Beijing, Beijing, 100083, China
  2. Beijing Key Laboratory of Special Melting and Preparation of High-end Metal, University of Science and Technology Beijing, Beijing, 100083, China
  3. State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing, 100083, China
  4. Melting and Casting Center, Beijing Institute of Aeronautical Materials, Beijing, 100095, China
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Materials Science
  Metallic Materials
  Mineral Resources
  
• 出版者：Journal Publishing Center of University of Science and Technology Beijing, in co-publication with Sp
• ISSN：1869-103X

文摘

The microstructure formation processes in HK40 and HH40 alloys were investigated through JmatPro calculations and quenching performed during directional solidification. The phase transition routes of HK40 and HH40 alloys were determined as L → L + γ → L + γ + M₇C₃ → γ + M₇C₃ → γ + M₇C₃ + M₂₃C₆→ γ + M₂₃C₆ and L → L + δ → L + δ + γ→ L + δ + γ + M₂₃C₆ δ + γ + M₂₃C₆, respectively. The solidification mode was determined to be the austenitic mode (A mode) in HK40 alloy and the ferritic–austenitic solidification mode (FA mode) in HH40 alloy. In HK40 alloy, eutectic carbides directly precipitate in a liquid and coarsen during cooling. The primary γ dendrites grow at the 60° angle to each other. On the other hand, in HH40 alloy, residual δ forms because of the incomplete transformation from δ to γ. Cr₂₃C₆ carbide is produced in solid delta ferrite δ but not directly in liquid HH40 alloy. Because of carbide formation in the solid phase and no rapid growth of the dendrite in a non-preferential direction, HH40 alloy is more resistant to cast defect formation than HK40 alloy.