Effect of long term ageing on γ' phase in spray formed FGH100L superalloy settled by different solution treatment
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摘要: 对喷射成形镍基高温合金FGH100L分别进行亚固溶和过固溶热处理，采用扫描电镜研究了长期时效对合金中γ′相尺寸和形貌的影响。结果表明：亚固溶热处理合金中有四种尺寸的γ′相，在长期时效过程中，一次、二次和大三次γ'相尺寸均有明显增长，小三次γ'相尺寸略有减小，四种γ'相长大规律均不符合Lifshitz，Slyozov和Wagner（LWS）粗化模型。一次γ'相、二次γ'相和大三次γ'相出现相似的分裂现象，二次γ'相在时效500 h后出现不稳定生长现象，合金中无拓扑密排（TCP）相析出。过固溶热处理合金中有三种尺寸的γ′相，在长期时效过程中，一次γ'相尺寸略有增长，二次γ'相和三次γ'相尺寸并没有明显变化，三种γ'相长大规律均不符合LSW粗化模型。一次γ'相和三次γ'相形貌基本不变，二次γ'相处于正在分裂状态，没有完全分裂，合金中无TCP相析出。过固溶热处理合金的γ'相尺寸和形貌变化比亚固溶热处理合金小，前者组织稳定性更高。Abstract: The effects of long term ageing on the size and morphology of γ' precipitations in the spray formed nickel-based superalloy FGH100L after subsolvs and supersolvs heat treatment (HT) were studied by scanning electron microscope (SEM). The results show that there are four kinds of γ' phases in the alloys after the subsolvs HT, and during the long term ageing, the sizes of primary, secondary, and large tertiary γ' phases increase while the size of small tertiary γ' phase decreases. None of these γ' phases grow in accordance with the coarsening kinetics as the Lifshitz, Slyozov, and Wagner (LWS) theory during the long term ageing. Apart from the small tertiary γ' phase, other three kinds of γ' phases began splitting in a similar way, and the secondary γ' phase shows the unstable protrusion after ageing for 500 h. No topological close packed (TCP) phase is found in the subsolvs HTed alloys. There are three kinds of γ' phases in the alloys after the supersolvs HT, and during the long term ageing, the primary γ' phase grows up slightly while the secondary and tertiary γ' phases show no obvious change. None of these γ' phases grow in accordance with the coarsening kinetics as LWS theory during the long term ageing. The morphology of primary and tertiary γ' phases changes little, and the secondary γ' phase is splitting at the early stage. No TCP phase is found in the supersolvs HTed alloys. The size and morphology variations of γ' phases in the supersolvs HTed alloys are smaller than those in the subsolvs HTed alloys, indicating that the former has the better microstructure stability.
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Key words:
- nickel-based superalloys /
- long-term ageing /
- γ' phase /
- spray forming /
- solution treatment
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图 1 亚固溶热处理FGH100L合金γ'析出相形貌
Figure 1. Morphology of the γ' precipitates in the FGH100L alloys after Sub-SHT
图 2 Sub-SHT合金经760 ℃长期时效后γ'析出相形貌：（a）和（b）500 h；（c）和（d）1000 h；（e）和（f）1500 h；（g）和（h）2000 h
Figure 2. Morphology of the γ' precipitates in the Sub-SHT alloys after the long term ageing at 760 ℃: (a) and (b) 500 h; (c) and (d) 1000 h; (e) and (f) 1500 h; (g) and (h) 2000 h
图 3 经760 ℃时效处理后的Sub-SHT合金γ'相尺寸变化
Figure 3. Size change of the γ' precipitates in the Sub-SHT alloys after the long term ageing at 760 ℃
图 4 过固溶热处理FGH100L合金γ'析出相形貌
Figure 4. Morphology of the γ' precipitates in the FGH100L alloys after Super-SHT
图 5 Super-SHT合金经760 ℃长期时效后γ'析出相形貌：（a）和（b）500 h；（c）和（d）1000 h；（e）和（f）1500 h；（g）和（h）2000 h
Figure 5. Morphology of the γ' precipitates in the Super-SHT alloys after the long term ageing at 760 ℃: (a) and (b) 500 h; (c) and (d) 1000 h; (e) and (f) 1500 h; (g) and (h) 2000 h
图 6 经760 ℃时效处理后的Super-SHT合金γ'相尺寸变化
Figure 6. Size change of the γ' precipitates in the Super-SHT alloys after the long term ageing at 760 ℃
表 1 经760 ℃时效处理后Sub-SHT合金中γ'相粗化速率与拟合优度
Table 1. Coarsening rate and fit goodness of the γ' precipitates in the Sub-SHT alloys after the long-term ageing at 760 ℃
γ'相种类 粗化速率 / (μm3·h−1) 拟合优度，R2 一次γ' 4.5400×10−2 0.767 二次γ' 4.0390×10−4 0.880 大三次γ' 2.8460×10−5 0.850 小三次γ' −0.5286 ×10−9 0.346 
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表 2 经760 ℃时效处理后Super-SHT合金中γ'相粗化速率与拟合优度
Table 2. Coarsening rate and fit goodness of the γ' precipitates in the Super-SHT alloys after the long-term ageing at 760 ℃
γ'相种类 粗化速率 / (μm3·h−1) 拟合优度，R2 一次γ' 1.038×10−4 0.384 二次γ' 2.985×10−6 −0.280 三次γ' 0.156 0.184
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