新型单晶高温合金长期高温时效后的显微组织和高温拉伸性能
Microstructure and High Temperature Tensile Properties of New Single Crystal Superalloy after Long Term Aging at High Temperature
摘 要
对一种新型单晶高温合金进行高温（1 100 ℃）时效，研究了不同时效时间（0，200，400，600，800，1 000 h）对其显微组织和高温（1 100 ℃）拉伸性能的影响。结果表明：时效前后，该新型单晶高温合金的组织均主要由γ基体和γ'相组成；随着时效时间的延长，γ基体通道的宽度及γ'相的尺寸均增大；时效600 h后，合金中析出与基体有明显取向关系的细针状TCP相，TCP相的析出量随着时效时间的延长而增加；单晶高温合金的高温屈服强度和抗拉强度均随着时效时间的延长而降低，断后伸长率和断面收缩率则先增大后减小；时效前后，单晶高温合金的拉伸断口均具有颈缩和韧窝特征，断裂机制均为韧窝断裂。
长期时效
拉伸性能
γ相
γ'相
single crystal superalloy
long term aging
tensile property
γ phase
γ' phase
Abstract
A new single crystal superalloy was aged at high temperature (1 100 ℃), and the effect of different aging times (0, 200, 400, 600, 800, 1 000 h) on the microstructure and high temperature (1 100 ℃) tensile properties of the superalloy was investigated. The results show that the microstructure of the new single crystal superalloy before and after aging was composed of γ matrix phase and γ' phase. The space of γ matrix channel and the size of γ' phase increased with increasing aging time. The needle shaped TCP phase with obvious orientation to matrix was precipitated in the alloy after aging for 600 h, and the volume fraction increased with the increase of aging time. With the aging time increasing, the yield strength and tensile strength of the single crystal superalloy at high temperature decreased, while the elongation and reduction of area after fracture increased first and then decreased. The tensile fracture surface of the single crystal superalloy all had features of necking and dimples before and after aging, and the fracture mechanism was dimple fracture.
中图分类号 TG132.3+2 DOI 10.11973/jxgccl202004012
所属栏目 材料性能及应用
基金项目
收稿日期 2019/4/15
修改稿日期 2020/2/28
网络出版日期
作者单位点击查看
备注史振学(1975-),男,山东曲阜人,高级工程师,博士
引用该论文: SHI Zhenxue,LIU Shizhong. Microstructure and High Temperature Tensile Properties of New Single Crystal Superalloy after Long Term Aging at High Temperature[J]. Materials for mechancial engineering, 2020, 44(4): 62～66
史振学,刘世忠. 新型单晶高温合金长期高温时效后的显微组织和高温拉伸性能[J]. 机械工程材料, 2020, 44(4): 62～66
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【3】史振学, 王效光, 刘世忠, 等. DD9单晶高温合金在800℃的高周旋弯疲劳性能[J]. 机械工程材料, 2016, 40(1):16-19.
【4】WALSTON W S,O'HARA K S,ROSS E W, et al. René N6:Third generation single crystal superalloy[C]//Superalloys 1996.Warrendale, Pennsylvania:TMS, 1996:27-34.
【5】ERICKSON G L. The development and application of CMSX-10[C]//Superalloys 1996. Warrendale, Pennsylvania:TMS, 1996:35-44.
【6】ACHARYA M V, FUCHS G E. The effect of long-term thermal exposures on the microstructure and properties of CMSX-10 single crystal Ni-base superalloys[J]. Materials Science and Engineering:A, 2004, 381(1/2):143-153.
【7】SHI Z X, LI J R, LIU S Z. Effect of long term aging on microstructure and stress rupture properties of a nickel based single crystal superalloy[J]. Progress in Natural Science:Materials International, 2012, 22(5):426-432.
【8】RAE C M F, KARUNARATNE M S A, SMALL C J, et al. Topologically close packed phases in an experimental rhenium-containing single crystal superalloy[C]//Superalloys 2000. Warrendale, Pennsylvania:TMS, 2000:767-777.
【9】HOBBS R A, ZHANG L, RAE C M F, et al. The effect of ruthenium on the intermediate to high temperature creep response of high refractory content single crystal nickel-base suepralloys[J]. Materials Science and Engineering:A, 2008, 489(1/2):65-76.
【10】史振学, 王效光, 杨万鹏, 等. 热暴露温度对单晶高温合金持久性能的影响[J]. 金属热处理, 2018, 43(5):1-5.
【11】YEH A C, TIN S. Effects of Ru on the high temperature phase stability of Ni-base single-crystal superalloys[J]. Metallurgical and Materials Transactions A, 2006, 37(9):2621-2631.
【12】SATO A, HARADA H, YOKOKAWA T, et al.The effects of ruthenium on the phase stability of fourth generation Ni-base single crystal superalloys[J]. Scripta Materialia, 2006, 54(9):1679-1684.
【13】ARGENCE D,VERNAULT C,DESVALLEES Y,et al.MC-NG:A 4th generation single-crystal superalloy for future aeronautical turbine blades and vanes[C]//Superalloys 2000. Warrendale, Pennsylvania:TMS, 2000:829-837.
【14】WALSTON S, CETEL A, MACKAY R, et al. Joint development of a fourth generation single crystal superalloy[C]//Superalloys 2004. Warrendale, Pennsylvania:TMS, 2004:15.
【15】CHEN J Y, FENG Q, SUN Z Q. Topologically close-packed phase promotion in a Ru-containing single crystal superalloy[J]. Scripta Materialia, 2010, 63(8):795-798.
【16】任英磊,金涛,管恒荣,等. 高温长期时效对镍基单晶高温合金γ'相形貌的影响[J]. 机械工程材料,2004, 28(3):10-12.
【17】AGHAIE-KHAFRI M, HAJJAVADY M. The effect of thermal exposure on the properties of a Ni-base superalloy[J]. Materials Science and Engineering:A, 2008, 487(1/2):388-393.
【18】金海鹏,李嘉荣. 第二代单晶高温合金DD6长期时效后的拉伸性能[J]. 材料工程, 2007,35(3):22-23.
【19】侯介山, 郭建亭, 周兰章,等. K44镍基高温合金长期时效过程中γ'相粗化对拉伸性能的影响[J]. 金属学报, 2006, 42(5):481-486.
【20】LIFSHITZ I M,SLYOZOV V V. The kinetics of precipitation from supersaturated solid solutions[J].Journal of Physics and Chemistry of Solids, 1961,19(1/2):35-50.
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