Abstract：Plastic deformed layers of as-cast single crystal(SX) nickel-based superalloy blade surface were formed by using three kinds of surface treatment process(grit blasting, abrasive belt polishing, felt wheel polishing). The deformed layers were electrolytic etched by using a specially designed electrolytic device, followed by standard heat treatment. Surface-treated deformed layers of single crystal superalloy blade and its electro-etched microstructures were investigated. The results show that the depths of deformed layers on as-cast SX blade surface are respectively about 6, 3.5μm and 2μm by using three kinds of surface treatment process. The microcrack fracture characteristics exist around the surface deformed layers by grit blasting and abrasive belt polishing. Large amounts of deformed γ' structure is existed in the electro-etched transition region of surface deformed layers, and the residual plastic deformation of three kinds of surface treatment process decreases successively in electro-etched transition region. Plastic deformation is not found in totally electro-etched region. After standard heat treatment, sag characteristics and recrystallized grains exist in non electro-etched region of deformed layers, but neither obvious pits nor recrystallized grains are found in totally electro-etched region.
薛燕鹏, 胡立杰, 赵金乾, 李嘉荣. 吹砂、抛光及其电解腐蚀后处理对单晶高温合金表面组织和再结晶行为的影响[J]. 材料工程, 2016, 44(2): 1-7.
XUE Yan-peng, HU Li-jie, ZHAO Jin-qian, LI Jia-rong. Effects of Grit Blasting, Polishing and Their Electro-etched Post-treatment on Surface Microstructures and Recrystallization Behavior of Single Crystal Superalloy. Journal of Materials Engineering, 2016, 44(2): 1-7.
 SCHAFRIK E R, WALSTON S. Challenges for high temperature materials in the new millennium[A]. Superalloys 2008[C]. Seven Spring, PA:TMS, 2008. 3-9.
 EUGENE S, HEFFERNAN T, HELMINK R. Stress rupture and fatigue in thin wall single crystal superalloys with cooling holes[A]. Superalloys 2012[C]. Seven Spring, PA:TMS, 2012. 353-362.
 REED C R. The superalloys fundamentals and applications[M]. Cambridge:Cambridge University Press, 2006. 21-24.
 HE Y H, HOU X Q, TAO C H, et al. Recrystallization and fatigue fracture of single crystal turbine blades[J]. Engineering Failure Analysis, 2011, 18(3):944-949.
 熊继春, 李嘉荣, 刘世忠, 等. 单晶高温合金DD6表面再结晶组织[J]. 材料工程, 2009,(增刊1):110-113. XIONG J C, LI J R, LIU S Z, et al. Microstructure of surface recrystallization of single crystal superalloy DD6[J]. Journal of Materials Engineering, 2009,(Suppl 1):110-113.
 熊继春, 李嘉荣, 赵金乾, 等. 单晶高温合金DD6再结晶晶界析出相特征及其形成机制[J]. 金属学报, 2009, 45(10):1232-1236. XIONG J C, LI J R, ZHAO J Q, et al. Characteristic and formation mechanism of precipitates at recrystallization grain boundaries of single crystal superalloy DD6[J]. Acta Metallurgica Sinica, 2009, 45(10):1232-1236.
 曲彦平, 刘丽荣, 祖国庆, 等. DD6单晶高温合金热处理过程中的再结晶组织演化[J]. 材料工程, 2011,(8):14-18. QU Y P, LIU L R, ZU G Q, et al. Microstructural evolution of recrystallization during heat treatment in DD6 single crystal superalloy[J]. Journal of Materials Engineering, 2011,(8):14-18.
 XIONG J C, LI J R, LIU S Z. Surface recrystallization in Nickel base single crystal superalloy DD6[J]. Chinese Journal of Aeronautics, 2010, 23(4):478-485.
 刘丽荣, 祖国庆, 黄景胜, 等. 单晶高温合金再结晶的影响因素[J]. 材料热处理学报, 2013, 34(3):55-59. LIU L R, ZU G Q, HUANG J S, et al. Influencing factors of recrystallization in single crystal superalloys[J]. Journal of Materials Engineering, 2013, 34(3):55-59.
 BURGEL R, PORTELLA P D, PREUHS J. Recrystallization in single crystals of nickel base superalloys[A]. Superalloys 2000[C]. Seven Spring, PA:TMS, 2000. 229-238.
 WANG L, XIE G, ZHANG J, et al. On the role of carbides during the recrystallization of a directionally solidified nickel-base superalloy[J]. Scripta Materialia, 2006, 55(5):457-460.
 ZHANG B, LU X, LIU D L, et al. Influence of recrystallization on high-temperature stress rupture property and fracture behavior of single crystal superalloy[J]. Materials Science and Engineering A, 2012, 551:149-153.
 MENG J, JIN T, SUN X F, et al. Effect of surface recrystallization on the creep rupture properties of a nickel-base single crystal superalloy[J]. Materials Science and Engineering:A, 2010, 527:6119-6122.
 WANG D L, JIN T, YANG S Q, et al. Surface recrystallization and its effect on rupture life of SRR99 single crystal superalloy[J]. Materials Science Forum, 2007, 546-549:1229-1234.
 XIE G, WANG L, ZHANG J, et al. Influence of recrystallization on the high-temperature properties of a directionally solidified Ni-base superalloy[J]. Metallurgical and Materials Transactions A, 2008, 39(1):206-210.
 SALKELD R W. Preparation of single crystal superalloy for post-casting heat treatment[P]. USA Patent:US 005413648 A, 1995-05-09.
 LI J R, ZHAO J Q, LIU S Z, et al. Effects of low angle boundaries on the mechanical properties of single crystal superalloy DD6[A]. Superalloys 2008[C]. Seven Spring, PA:TMS, 2008. 443-451.
 JO C Y, CHO H Y, KIM H M. Effect of recrystallisation on microstructural evolution and mechanical properties of single crystal nickel base superalloy CMSX-2 Part 1-Microstructural evolution during recrystallisation of single crystal[J]. Materials Science and Technology, 2003, 19(12):1665-1670.