Study on deformation behavior and microstructure evolution at elevated temperatures of nickel based superalloy GH4065A
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摘要: 运用热力压缩试验设备对取自工业三联工艺(VIM+ESR+VAR)铸锭并完成均匀化的GH4065A样品进行试验。结果揭示了热加工工艺参数变形温度、应变速率和工程应变量对GH4065A流变应力的影响，并通过试验数据建立起GH4065A 50%工程应变量下的本构方程。在此基础上，通过试验数据绘制了GH4065A的热加工图和失稳判据图，明确了其稳定变形的加工区间。通过对变形组织演变规律的研究，明确了γ’相析出范围、未再结晶工艺条件、部分再结晶工艺条件、完全再结晶工艺条件，并绘制了GH4065A的再结晶图。Abstract: This paper performs thermal compression studies on GH4065A samples from a sample disk that is obtained from an industrial plant and has undergone VIM+ESR+VAR and homogenization. This study reveals the impact of thermal compression parameters such as deformation temperature, strain rate and engineering strain on the flow stress of GH4065A, and constructs constitutive equations of GH4065A at the 50% engineering strain. Based on experimental data, the thermal processing map and instability criterion map of GH4065A are proposed, by which the stable processing zones of GH4065A can be identified. This paper also studies the microstructure evolution of GH4065A, and the results reveal the precipitation range of γ’ phase, non-recrystallization processing range, partial recrystallization processing range, and full recrystallization processing range of GH4065A, by which the recrystallization map is proposed.
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图 1 GH4065A已均匀化自耗锭典型组织
(a)×100倍光镜；(b) ×10500倍电镜
Figure 1. Typical microstructure of the homogenized GH4065A VAR ingot
图 2 工程应变量为50%时变形温度对流变应力的影响
(a)应变速率0.0005 s−1；(b)应变速率0.001 s−1；(c)应变速率0.01 s−1；(d)应变速率0. 1 s−1；(e)应变速率1 s−1
Figure 2. The impact of deformation temperature on flow stress at the 50% engineering strain
图 3 工程应变量为50%，应变速率为0.1 s−1，变形温度为1050 ℃时弥散析出的γ’相光镜照片
Figure 3. Optical microscope of γ’phase dispersive precipitation at the 50% engineering strain, 0.1 s−1 strain rate and 1050 ℃
图 4 工程应变量为50%时不同温度下应变速率对流变应力的影响
Figure 4. The impact of strain rate on flow stress at the 50% engineering strain with different temperature
(a)950 ℃；(b)1000 ℃；(c)1050 ℃；(d)1100 ℃；(e)1150 ℃
图 5 应变速率为0.01 s−1时工程应变量对流变应力的影响
Figure 5. The impact of engineering stain on flow stress at the strain rate of 0.01 s−1
图 7 峰值应力试验值和计算值拟合关系
Figure 7. Correlation of experimental data and fitted data of peak stresses
图 8 GH4065A在50%工程应变量时的热加工和失稳判据
Figure 8. Thermal processing map and instability criterion map of GH4065A at the 50% engineering strain
图 9 工程应变量为50%时变形温度和变形速率对组织的影响
Figure 9. The impact of deformation temperature and strain rate on microstructures at the 50% engineering strain
图 10 工程应变量为70%时变形温度和变形速率对组织的影响
Figure 10. The impact of deformation temperature and strain rate on microstructures at the 70% engineering strain
图 11 变形速率1 s−1时工程应变量对组织的影响
Figure 11. The impact of engineering strain on microstructures at the 1 s−1 strain rate
图 12 变形速率0.1 s−1时工程应变量对组织的影响
Figure 12. The impact of engineering strain on microstructures at the 0.1 s−1strain rate
图 13 变形速率0.01 s−1时工程应变量对组织的影响
Figure 13. The impact of engineering strain on microstructures at the 0.01 s−1 strain rate
图 14 GH4065A合金发生完全动态再结晶条件
Figure 14. Full dynamic recrystallization map of GH4065A
(a) 1 s−1；(b) 0.1 s−1；(c) 0.01 s−1
表 1 GH4065A经均匀化后的自耗锭样品成分范围
Table 1. Composition range of the GH4065A sample disk from a homogenized VAR ingot
% Al Co Cr Mo Nb Ti W Fe Ni 2.19~2.20 13.40~13.49 16.17~16.27 4.10~4.18 0.695-0.752 3.53~3.69 3.61-3.68 0.21~0.22 55.73-56.12 
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