不同热处理温度对吹砂后DD3合金持久性能的影响

Effects of Different Heat Treatment Temperature on Stress Rupture Properties of DD3 Alloy after Blowing Sand

对标准热处理后的第一代单晶高温合金DD3吹砂,然后采用不同温度进行热处理,研究了吹砂后热处理温度对合金1000℃/195 MPa持久性能的影响。结果表明,1050℃时,合金未发生再结晶,但析出粗大γ′相,持久性能有所降低;1150℃时,合金发生再结晶,再结晶使合金的持久性能明显降低;1250℃时,合金也发生再结晶,但由于合金母体组织均匀,γ′相细化且立方化较好,致使该条件下合金持久性能仍然保持在较高水平。

Blowing sand was performed on DD3 alloy samples after standard heat treatment. Subsequently, the heat treatment of samples was carried out at different temperatures. The effects of the heat treatment temperatures on the stress rupture properties at 1000℃ / 195 MPa after blowing sand for the first generation single crystal superalloy DD3 were investigated. The results show that no recrystallization occurs at 1050℃ but coarse γ′ phases precipitate and stress rupture property decreases. Recrystallization occurs at 1150℃ and the stress rupture property decrease notably. At 1250℃ treatment condition, recrystallization happens yet stress rupture property exhibit a high level because of finer γ′ phases and good microstructures .