Study on as-cast microstructure and homogenization of wrought superalloy GH4065A
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摘要: 应用SEM、DSC等试验方法研究了高温合金GH4065A电渣锭不同部位的铸态组织，并设计不同温度和时长的均匀化工艺制度处理样品，随后研究了不同均匀化制度下样品的微观组织演变和残余偏析指数变化规律。结果表明，铸态GH4065A中主要析出相为γ-γ’共晶相，硼化物相和TiN相，偏析较为严重的元素为Ti、Nb、Mo、W。经1160 ℃、10 h均匀化处理可以将析出相消除，并使Ti、Nb、Mo的残余偏析指数降至0.2左右，W的残余偏析指数降至0.4左右，是较合理的均匀化条件。生产现场由于铸锭尺寸较大，在1160 ℃炉内维持20 h左右均匀化时长是一个较为合理的均匀化制度。Abstract: The as-cast microstructure of the samples from multiple locations of an ESR ingot of superalloy GH4065A had been characterised by SEM and DSC, and then evolution of microstructure and residual segregation index of the samples treated under a variety of designed homogenization schemes had been investigated. The results show that γ-γ’ eutectic phase, borides and TiN are the major precipitated phases in the as-cast microstructure of GH4065A. Ti, Nb, Mo and W are the major segregated elements. After homogenization at 1 160 ℃ for 10 h, the precipitated phases mostly dissolves and residual segregation index of Ti, Nb, Mo reduces down to about 0.2, and index of W down to 0.4, which demonstrates homogenization at 1 160 ℃ for 10 h is reasonable treatment condition. Due to the large scale of ingots in industrial production, it is acceptable to immerse the ingot in the furnace of 1 160 ℃ for 20 h to achieve homogenization.
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Key words:
- wrought superalloy /
- homogenization /
- microstructure /
- segregation characteristics
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图 2 铸态GH4065A各元素不同位置偏析系数
Figure 2. Segregation coefficient of elements in as-cast GH4065A
图 3 铸态GH4065A不同位置枝晶形貌及二次枝晶间距测量结果
Figure 3. Second dendritic distance measurements of multiple locations at as-cast GH4065A ingot
图 4 铸态GH4065A DSC加热曲线一阶导数
Figure 4. First derivative of DSC heating curve of as-cast GH4065A
图 5 GH4065A不同均匀化温度及时长下组织形貌
Figure 5. Morphology of GH4065A samples treated by a variety of homogenization schemes
图 6 不同均匀化温度及时间元素残余偏析指数变化
Figure 6. Residual segregation index evolution of elements in ingot treated by a variety of homogenization schemes
图 7 阶段式均匀化工艺各元素残余偏析指数变化
Figure 7. Residual segregation index evolution of elements in ingot treated by individual homogenization steps
图 8 铸锭正中心温度随加热时间变化计算结果
Figure 8. Computation result of temperature at the ingot core with homogenization time
C Cr Ni Co Fe Ti Al Nb Mo W 0.03 16.0 余 13.0 1.0 3.7 2.1 0.7 4.0 4.0 
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表 2 GH4065A电渣重熔锭样品成分范围
Table 2. Composition range ofthe GH4065A samples from ESR 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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