热处理对FGH96粉末高温合金裂纹扩展速率的影响

Influence of Heat Treatments on Crack Propagation Rates of FGH96 P/M Superalloys

摘要:

研究不同热处理条件下FGH96粉末高温合金在650 ℃空气中疲劳/蠕变交互作用下的裂纹扩展速率，分析不同热处理对FGH96粉末高温合金裂纹扩展速率的影响规律。结果表明：提高固溶温度和盐浴温度可降低合金的裂纹扩展速率，固溶温度对裂纹扩展速率的作用程度大于盐浴温度的作用程度。降低时效温度和缩短时效时间也可延缓合金的裂纹扩展速率，时效温度对裂纹扩展速率的影响大于时效时间。另外，增加保载时间可以加快合金的裂纹扩展速率，但保载时间的影响随着时效温度的升高而减小。

Abstract:

Crack propagation rates of FGH96 P/M superalloys with different heat treatments were tested and compared under fatigue/creep interaction at 650 ℃ in air. Influence of heat treatments on the crack propagation rates of FGH96 P/M superalloys was investigated. The results indicate that the crack propagation rates were decreased when increasing the solid solution temperature or salt bath temperature; the effect of solid solution temperature was greater than that of salt bath temperature. Lower aging temperature and shorter aging time also delayed the crack propagation rates; the effect of the aging temperature was greater than that of the aging time. In addition, the crack propagation rates were increased with the dwelling time prolonging, and its effect decreased with the aging temperature increasing.