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研究了高温时效对标准和改型Thermo-Span合金组织和持久性能的影响,在650℃时效1000 h,标准合金的晶内与晶界Laves析出相均发生了粗化,而改型合金的析出相形貌没有改变,当时效温度增高到680℃时,标准合金在时效500 h时,合金的析出相已经发生了严重的粗化,Laves相的形态由圆粒状变成条状,而改型合金的析出相没有变化,当时效到1000 h后,标准合金析出相已经完全粗化,析出相几乎布满了整个晶内,而改型合金晶界只有少量析出相开始发生粗化,经650℃时效1000 h后,改型合金具有较好的组织热稳定性,合金650℃/600 MPa的持久性能比标准合金高109 h。
The effects of high temperature aging on the microstructure and permanent properties of standard and modified Thermo-Span alloys were investigated. At 650 ℃ for 1000 h, both the intragranular and intergranular Laves precipitates of the standard alloy were roughened, while the precipitation of the modified alloy Phase morphology did not change, when the aging temperature increased to 680 ℃, the standard alloy aged at 500 h, the precipitation phase of the alloy has undergone a serious coarsening, Laves phase morphology from round to strip, while the modified When the aging time reaches 1000 h, the standard alloy precipitation phase has been completely roughened, the precipitated phase is almost covered with the entire crystal, and only a small amount of precipitation phase of the modified alloy grain begins to coarsen. After 650 ℃ aging 1000 h, the modified alloy has better thermal stability of the alloy, the durability of the alloy 650 ℃ / 600 MPa higher than the standard alloy 109 h.