铸态K480和DD407高温合金在长期时效过程中γ′相的稳定性
Stability of γ′ Phase in Cast Superalloy K480 and DD407 During Long Term Ageing
摘 要
研究了两种典型铸态K480及 DD407高温合金在870 ℃下经3 000 h时效过程中γ′相的稳定性, 探讨γ′相的粗化机制。结果表明: K480合金和DD407合金经过长期时效后组织中均无TCP相析出, γ′相发生轻微粗化现象, 合金组织稳定性良好, 其中DD407合金中γ′相长大趋势大于K480合金的; 随着时效时间的延长, K480合金中晶界逐渐变宽, 碳化物沿晶界长大, 最终连结成链状, 并有成膜趋势; K480合金中γ′相长大符合二次方定律, 而DD407合金的符合三次方定律; 该两种合金γ′相长大方式分别为界面控制和扩散控制。
单晶合金
γ′相
稳定性
长期时效
superalloy
single crystal superalloy
γ′ phase
stability
long term ageing
Abstract
The evolution and mechanism of γ′ phase growth in cast superalloy K480 and DD407 were studied during the ageing at 870 ℃ for 3 000 h. The results indicated that there were no TCP phase precipitating from matrix for both alloys, the γ′ phase coarsened slightly, but the γ′ phase grew faster in the DD407 alloy than in the K480 alloy. Generally, both alloys have good microstructure stability during long term ageing. With the increase of ageing time, grain boundary of K480 became broader, and carbides grew up along grain boundary, finally carbides chain formed and even gradually changed into carbides film. The relationship between of γ′ phase size and ageing time for K480 alloy followed the square law, while it followed the cubic law for DD407 alloy. The growth mechanism of γ′ phase for K480 and DD407 alloy were mainly controlled by interface and diffusion, respectively.
中图分类号 TG132.32 DOI 10.11973/jxgccl201506014
所属栏目 材料性能及其应用
基金项目 国家自然科学基金(青年)资助项目(51401020);北京市自然科学基金资助项目(2154051);中央高校基本业务基金资助项目(FRF-TP-14-002A2, FRF-IC-14-003 );教育部新教师基金资助项目(20130006120005)
收稿日期 2014/8/26
修改稿日期 2015/3/27
网络出版日期
作者单位点击查看
备注姚志浩(1982—), 男, 内蒙古赤峰人, 讲师, 博士。
引用该论文: YAO Zhi-hao,DONG Jian-xin,ZHANG Mai-cang,Chen Hao,Yu Qiu-ying. Stability of γ′ Phase in Cast Superalloy K480 and DD407 During Long Term Ageing[J]. Materials for mechancial engineering, 2015, 39(6): 67～72
姚志浩,董建新,张麦仓,陈昊,于秋颖. 铸态K480和DD407高温合金在长期时效过程中γ′相的稳定性[J]. 机械工程材料, 2015, 39(6): 67～72
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【2】谢锡善, 我国高温材料的应用和发展[J]. 机械工程材料, 2004, 28(1): 2-11.
【3】NATHAL M V, MACKAY R A, MINER R V. Influence of precipitate morphology on intermediate temperature creep properties of a nickel-base superalloy single crystal[J]. Metallurgical and Materials Transaction: A, 1989, 20(1): 133-141.
【4】于秋颖, 张麦仓, 董建新, 等. 难变形镍基高温合金GH710的高温变形特性[J]. 机械工程材料, 2012, 36(12): 62-72.
【5】姚志浩, 董建新, 陈旭, 等. GH738高温合金长期时效过程中γ′相演变规律[J]. 材料热处理学报, 2013, 34(1): 31-37.
【6】MUKHERJI D, ROSLER J. Effect of the γ′ volume fraction on the creep strength of Ni-base superalloys[J]. Zeitschrift Fur Metallkunde, 1994(5): 478-484.
【7】FOOTNER P K, RIHARDS B P. Long term growth of superalloy γ′ particles[J]. Journal of Materials Science, 1982, 17: 2141-2153.
【8】GES A, FORNARO O, PALACIO H. Long term coarsening of γ′ precipitates in a Ni-base superalloy[J]. Journal of Materials Science, 1997, 32: 3687-3691.
【9】BALIKCI E, RAMAN A, MIRSHAMS R A. Influence of various heat treatments on the microstructure of polycrystalline IN738LC[J]. Metallurgical and Materials Transaction, 1997, 28: 1993-2003.
【10】BALIKCI E, RAMAN A. Characteristics of the γ′ precipitates at high temperatures in Ni-base polycrystalline superalloy IN738LC[J]. Journal of Materials Science, 2000, 35(14): 3593-3597.
【11】BALDAN A. Progress in Ostwald ripening theories and their applications to the γ′ precipitates in nickel-base superalloys[J]. Journal of Materials Science, 2002, 37(12): 2379-2405.
【12】MACKAY R A, EBERT L J. The development of γ-γ′ lamellar structures in a nickel-base superalloy during elevated temperature mechanical testing[J]. Metallurgical and Materials Transaction: A, 1985, 16(11): 1969-1982.
【13】MALOW T, ZHU Jia-wei, WAHI R P. Influence of heat treatment on the microstructure of the single-crystal nickel-base superalloy SC16[J]. Journal of Metallurgical Engineering, 1994, 85(1): 9-19.
【14】SOUCAIL M, BIENVENU Y. Dissolution of the γ′ in a nickel base superalloy at equilibrium and under rapid heating[J]. Materials Science and Engineering: A, 1996, 220: 215-222.
【15】YAO Z H, ZHANG M C, DONG J X. Stress rupture fracture model and microstructure evolution for waspaloy[J], Metallurgical and Materials Transactions: A, 2013, 44(7): 3084-3098.
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