摘要
研究标准热处理(1180℃×4 h/AC+1080℃×4 h/AC+845℃×24 h/AC+760℃×16 h/AC)后的难变形镍基高温合金GH710在650℃和870℃经0～3000 h长期时效后的组织演变。结果表明:650℃时效时,γ'相粗化不明显,晶界碳化物基本不变,合金组织稳定性良好;长期时效时,γ'相的粗化行为遵循扩散控制的L-S-W粗化机制,且时效温度越高,粗化速率越大;870℃时效时,一次γ'相急剧粗化,但时效2000 h后发生部分回溶,晶界碳化物聚合粗化现象严重,且硬度值也下降明显。
Microstructure evolution of difficult-to-deform nickel-base superalloy GH710 subjected to standard heat treatment （1180 ℃ × 4 h/AC ＋ 1050℃ x4 h/AC ＋845℃×24 h/AC ＋760℃ × 16 h/AC） followed by long time aging at 650℃ and 870℃for up to 3000 h was investigated. The results show that no significant coarsening of phase is observed and the grain boundary carbides keep stable after long time aging at 650℃, illustrating that structure stability of this alloy is good. The growth of γ＇ phase follows L-S-W coarsening mechanism, and the higher is the temperature, the faster is the coarsening rate. Primary γ＇ precipitates coarsen dramatically before partial dissolving after aging at 870 ℃ for 2000 h, grain boundary carbides aggregate and grain boundaries widen baddly, and average hardness of this alloy decreases obviously after long time aging at 870 ℃.
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2013年第3期84-88,共5页
Transactions of Materials and Heat Treatment
基金
航空科学基金(2010ZF74004)
