TiAl合金增压器涡轮的耐久性试验研究

Evaluation of endurance for turbocharger wheel of TiAl based alloy

摘要:

本文针对某增压器台架耐久性考核240小时的直径100mm的TiAl合金涡轮，通过对比分析考核前后涡轮轮毂芯部的微观组织和力学性能，并结合未考核涡轮轮毂取样的高温持久试验结果，评价了TiAl合金增压器涡轮轮毂的耐久性。结果表明，在考核试验后，涡轮轮毂芯部的微观组织、洛氏硬度和室温拉伸强度仍保持考核前的水平；同时，参照该型涡轮服役条件下的高温持久加载后，试样的层片组织仍保持完整，仅只在层片团界析出了体积分数0.5%的等轴γ晶粒。可见，该TiAl涡轮轮毂具有良好的耐久性，能够满足应用要求。

Abstract:

Based on TiAl turbocharger wheel with the diameter of 100mm after rig endurance test for total 240 hours, this paper evaluated the endurance of turbocharger wheel hub from the microstructure and mechanical properties. The microstructure and mechanical properties of the samples cut from the hub core of turbocharger wheel still retained a considerable level after endurance test. And the microstructure of the sample cut from the hub core of turbocharger wheel without rig test had an excellent stability after stress creep loading for 1000 hours at the actual working condition. So the hub of the turbocharger wheel had an condirable endurance that could meet the application requirement.