摘要
研究了4种固溶温度:1000、1040和1080和1120℃×4 h,AC(空冷)+双时效(845℃×24 h/AC+760℃×16 h/AC)热处理制度对铸造waspaloy合金组织的影响。结果表明,铸态waspaloy合金组织由γ基体、团状γ'相和MC碳化物组成。固溶处理后,铸态γ'相溶解到基体中,并随固溶温度升高,铸态γ'相含量逐渐减少。当固溶温度大于1080℃时,枝晶形貌消失,铸态γ'相完全溶解;在随后845℃稳定化处理过程中,均匀细小的二次γ'相开始析出,MC碳化物开始分解,并在晶界处析出不连续的粒状M23C6碳化物;经过760℃时效处理后,更多均匀细小的二次γ'相析出并长大。最终确定铸造waspaloy合金的最佳固溶温度应大于1080℃,此时经时效后组织更加均匀一致。
Microstructure of waspaloy alloy for gas turbine blade solution-treated at 1040,1060,1080 ℃ for 4 h air cooling,and then double-aged at 845 ℃ for 24 h and 760 ℃ for 16 h was investigated.The results indicate that the microstructure of the waspaloy alloy is composed of γ,γ' and MC carbides.γ' phase shows irregularly spherical morphology.After the solution treatment,the prime γ'phase dissolves in the matrix.With the increasing of solution temperature,the fraction of prime γ' phase decreases.Particularly,when the solution temperature is higher than 1080 ℃,the prime γ' phase dissolves entirely into γ matrix.After stabilization treatment,even and regularly spherical γ' phase re-precipitates throughout γ matrix,MC carbides decompose and M23C6carbide precipitates,which have a granular shape.After aging treatment,more homogeneous γ' phase re-precipitates and grows.It shows that the microstructure of as-cast waspaloy alloy is more homogeneous after aging treatment,when the solution temperature is higher than 1080 ℃.
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2014年第S1期146-153,共8页
Transactions of Materials and Heat Treatment
