固溶处理对一种第四代镍基单晶高温合金
微观组织和偏析的影响
赵新宝1，岳 亮1，夏万顺1，岳全召1，贝红斌1，韦 华2，魏 晓1，张 泽1*
（1.浙江大学 高温合金研究所，材料科学与工程学院，浙江 杭州310027；
2.浙江大学 超重力研究中心，浙江 杭州310027）
摘 要 利用扫描电子显微镜及能谱研究了固溶处理温度对一种第四代镍基单晶高温合金微观组织和枝晶偏析的影响。结果表明：铸态合金中存在显著的成分偏析，其中Ru和Mo的偏析系数接近1；随着固溶温度的升高，枝晶组织形貌特征退化，成分偏析明显减轻，但在1360 ℃固溶时合金部分组织出现初溶，限制了固溶温度上限。提高最高固溶温度可一定程度增大γ′相尺寸，显著降低合金的微观偏析，但Re和W元素在高温固溶后仍存在明显的残余偏析。
关键词 镍基单晶高温合金；固溶处理；微观形貌；枝晶偏析
中图分类号：
文献标识码：Adoi:10.3969/j.issn.1000-6281.2020.05.002
The influence of solution treatment temperature on the microstructure and microsegregation of a fourth generation nickel-based single crystal superalloy
ZHAO Xin-bao1，YUE Liang1，XIA Wan-shun1，YUE Quan-zhao1，BEI Hong-bin1，WEI Hua2，WEI Xiao1，ZHANG Ze1*
（1. Institute of Superalloy Science and Technology,School of Materials Science and Engineering, Zhejiang University, Hangzhou Zhejiang 310027；2. Center for Hypergravity Experimental and Interdisciplinary Research, Zhejiang University，Hangzhou Zhejiang 310027, China）
Abstract The effect of solution treatment temperature on the microstructure and dendritic microsegregation of a fourth generation nickel-based single crystal superalloys was investigated by scanning electron microscopy and energy dispersive spectrometer. The results show that many elements significantly microsegregate in the as-cast superalloy. Ru and Mo is relatively homogeneous with their segregation coefficients are close to 1. As the solution temperature increases, the dendritic microstructure degrades and the elemental segregation alleviated obviously. However, local initial melting occurs at 1360 ℃, which limits further temperature increase. Higher solution temperature can result in larger size of γ′ phase, and effectively reduce the dendrite segregation of the superalloy. However, even in the highest solution treatment temperatures of this study, the microgregation of Re and W still have not completely eliminated.
Keywords Nickel-based single crystal superalloys; solution heat treatment; microstructure; dendrite segregation
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[1] REED R C. The Superalloys Fundamentals and Applications [M]．Cambridge: Cambridge University Press, 2006. 3-10．
[2] 张健，楼琅洪，李辉. 重型燃气轮机定向结晶叶片的材料与制造工艺[J]. 中国材料进展，2013, 32(1): 12-23，38.
[3] FENG Q, CARROLL L J, POLLOCK T M. Solidification segregation in ruthenium-containing nickel-base superalloys [J]. Metallurgical and Materials Transactions A, 2006, 37A: 1949-1962.
[4] 朱鸥，李玉龙，张燕，等. 航空发动机用单晶铸造高温合金热处理工艺[J]. 铸造技术，2013, 34(9): 1137-1140.
[5] ZHANG H, YUAN L, CHEN X. Microstructure homogenization and high-temperature cyclic oxidation behavior of a Ni-based superalloy with high-Cr content [J]. Journal of Alloys and Compounds, 2017, 717: 410-418.
[6] XIA W S, ZHAO X B, YUE L, et al. A review of composition evolution in Ni-based single crystal superalloys [J]. Journal of Materials Science and Technology, 2020, 44: 76-95.
[7] 朱鸥，李玉龙，张燕，等. 航空发动机用单晶铸造高温合金热处理工艺[J]. 铸造技术，2013, 34(9): 1137-1140.
[8] WILSON B C, HICKMAN J A, FUCHS G E. The effect of solution heat treatment on a single-crystal Ni-based superalloy [J]. Journal of the Minerals, Metals and Materials Society, 2003, 55(3): 35-40.
[9] FUCHS G E. Solution heat treatment response of a third generation single crystal Ni-base superalloy [J]. Materials Science and Engineering A, 2001, 300(1/2): 52-60.
[10] ZHANG Y B, LIU L, HUANG T W, et al. Investigation on remelting solution heat treatment for nickel-based single crystal superalloys [J]. Scripta Materialia, 2017, 136: 74-77.
[11] 胡壮麒，刘丽荣，金涛，等. 镍基单晶高温合金的发展[J]. 航空发动机，2005，31(3):1-7.
[12] 艾菲，徐玲，崔传勇，等. 一种镍钴基合金的γ′相在高温下析出行为的透射电镜研究[J]. 电子显微学报，2018, 37(5): 442-449.
[13] 丁青青，李吉学，张泽. 镍基单晶高温合金相界与界面位错的相互作用[J]. 电子显微学报，2017, 36(2): 91-95.
[14] MACKAY R A, EBERT L J. The development of directional coarsening of the γʹ precipitate in superalloy single crystals [J]. Scripta Metallurgica, 1983, 17(10):1217-1222.
[15] CARON P, KHAN T. Improvement of creep strength in a nickel-base single-crystal superalloy be heat treatment [J]. Materials Science and Engineering, 1983, 61(2):173-184.
[16] 李宪，张晓娜，于潇翔，等. 固溶时间对镍基单晶高温合金中Re，Ru元素分布和微观形貌的影响[J]. 电子显微学报，2014, 33(4): 318-323.
[17] HECKL A, RETTIG R, CENANOVIC S, et al. Investigation of the final stages of solidification and eutectic phase formation in Re and Ru containing nickel-base superalloys [J]. Journal of Crystal Growth, 2010, 312: 2137-2144.
[18] CALDWELL E C, FELA F J, FUCHS G E. Segregation of elements in high refractory content single crystal nickel based superalloys[A]. In: Green K A, Pollock T M，Harada H, et al．Superalloys 2004[C]. Warrendale: TMS, 2004, 811-818.
[19] FUCHS G E. Improvement of creep strength of a third generation, single-crystal Ni-base superalloy by solution heat treatment [J]. Journal of Materials Engineering and Performance, 2002,11:19-25.
[20] YU J J, SUN X F, ZHAO N R, et al. Effect of heat treatment on microstructure and stress rupture life of DD32 single crystal Ni-base superalloy [J]. Materials Science and Engineering A, 2007, 460: 420-427.
[19] HINO T, KOBAYASHI T, KOIZUMI Y, et al. Development of a new single crystal superalloy for industrial gas turbines [A]. In: POLLOCK T M，KISSINGER R D，BOWMAN R R, et al．Superalloys 2000[C]. Warrendale: TMS, 2000, 729-736.
[21] ZHANG J X, MURAKUMO T, HARADA H, et al. Dependence of creep strength on the interfacial dislocations in a fourth generation SC superalloy TMS-138 [J]. Scripta Materialia, 2003,48: 287-293.
[22] SATO A, YEH A C, KOBAYASHI T, et al. Effect of primary ageing temperature on creep properties of advanced Ni-base single crystal superalloys [J]. The Japan Institute of Metals, 2006, 70(8): 666-669.
