Udimet500镍基高温合金长期蠕变行为

The Creep Behavior under Long Term Deformation of Ni base Superalloy Udimet500

系统分析 U dim et5 0 0合金经由 80 0℃和 90 0℃不同应力条件下的蠕变行为规律 ,并结合显微组织分析以揭示合金的蠕变变形行为。结果显示 ,合金很快达到稳态蠕变阶段 ,随后马上进入蠕变第三阶段 ,即蠕变过程主要由加速蠕变控制。组织分析表明 ,高温蠕变过程中γ′强化相粗化 ,晶界相的析出及加宽 。

WT5BZ]Incorporating with microstructure analysis, the creep deformation behaviors of Udimet 500 alloy at the temperature of both 800℃ and 900℃ under different long term deformation conditions were systematically analyzed. The results show that the creep deformation of this alloy is mainly controlled by the creep accelerating stage, or the creep deformation get to its stable stage quickly and then get to the third stage instantaneously. Perhaps the coarsening of gamma prime phase, the precipitation and growth of phases at the grain boundary and the precipitation of sigma phase are the primary reasons for creep acceleration of this alloy.