Effects of Thermal Exposure on Structures of DD6 Single Crystal Superalloy with Thermal Barrier Coatings
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摘要: 采用0.3 MPa压力对DD6单晶高温合金进行水吹砂, 然后用电子束物理气相沉积的方法在DD6合金基体上制备了热障涂层, 将带热障涂层试样置于1100℃空气气氛中分别进行50 h和100 h热暴露, 在1100℃/130 MPa条件下测试持久性能。研究了水吹砂及高温热暴露对带热障涂层DD6合金组织的影响。结果表明：0.3 MPa压力水吹砂制备热障涂层并高温热暴露后没有发现再结晶组织；热暴露过程中, 基体和涂层之间的元素会发生不同程度的互扩散；表面残余应力和元素互扩散导致了γ'相粗化方向的变化；性能测试后试样断口附近的涂层与基体界面下方局部区域形成了二次反应区。Abstract: In order to investigate the effect of water grit-blasting and high temperature thermal exposure on the microstructures of DD6 alloy with TBCs, DD6 single crystal superalloy specimens were water grit-blasted with 0.3 MPa pressure, then the specimens were coated with thermal barrier coatings by electron beam physical vapor deposition (EB-PVD). Specimens with TBCs were exposed at 1100℃ for 50 and 100 hours in the air respectively, and then these specimens were subjected to stress-rupture tests under the condition of 1100℃/130 MPa. The results show that grit-blasting doesn't lead into the recrystallization, thermal exposure can induce element interdiffusion between the bond coat and alloy substrate, the residual stress and element diffusion lead into the changes of γ' phase coarsing direction. After stress rupture tests, the secondary reaction zone emerges into a local area.
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Key words:
- thermal barrier coatings /
- thermal exposure /
- DD6 /
- structures
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图 1 带热障涂层的DD6试样界面组织
Figure 1. Microstructure of DD6 alloy specimen with bond coat and TBC
图 2 水吹砂并1100 ℃热暴露50 h后试样的界面组织
Figure 2. Interface microstructure of the specimen after water grit-blast and exposure at 1100 ℃ for 50 h
图 3 带涂层试样不同热暴露时间后互扩散区元素分布(a)未热暴露；(b)1100 ℃热暴露50 h；(c)1100 ℃热暴露100 h
Figure 3. Elemental concentration profiles of diffusion zone of TBCs coated DD6 alloy (a)no exposure; (b)exposed at 1100 ℃ for 50 h; (c)exposed at 1100 ℃ for 100 h
图 4 1100 ℃热暴露后涂层下方基体γ′相组织(a)横向粗化；(b)纵向粗化；(c)正常组织
Figure 4. γ′ phases of DD6 specimens with TBCs after exposure at 1100 ℃ (a)horizontal; (b)longitudinal; (c)normal
图 5 1100 ℃/130 MPa持久测试后试样表面形貌
Figure 5. Surface morphology of specimens after stress rupture test
图 6 1100 ℃热暴露不同时间带涂层试样持久性能测试后局部界面组织
Figure 6. Microstructures of stress rupture specimens after thermal exposure at 1100 ℃ (a)50 h; (b)100 h
图 7 带涂层试样性能测试后的基体组织形貌
Figure 7. Substrate's microstructures of the specimens with TBCs after stress rupture tests (a) exposed for 50 h; (b)exposed for 100 h
表 1 DD6合金的名义成分(质量分数/%)
Table 1. Nominal composition of DD6 alloy(mass fraction/%)
Cr Co Mo W Re Ta Nb Al Hf C Ni 4.3 9 2 8 2 7.5 0.5 5.6 0.1 0.006 Bal. 
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表 2 HY5名义成分(质量分数/%)
Table 2. Nominal composition of HY5(mass fraction/%)
Ni Co Cr Al Y Hf 49.9-63.7 10-15 18-23 8-12 0.1-0.5 0.2-0.6
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