TC4钛合金在200℃时的蠕变持久特性

Creep Characteristic of Titanium Alloy TC4 at 200℃

研究了ＴＣ４钛合金在２００℃，１０００ｈ条件下的蠕变、持久特性。结果表明，该合金轧制棒材在２００℃和较低应力下具有蠕变饱和现象；１０００ｈ，残余变形量０．１％的蠕变强度为５６１ＭＰａ；１０００ｈ以内的持久强度极限为７７９．６３ＭＰａ，该值与试验持续时间无关。蠕变饱和及持久强度与试验时间无关的特性是由试验过程中的形变强化引起的。

A creep characteristic and endurance failure of titanium alloy TC4 at 200℃ for 1 000 h have been investigated. The results show that a rolled bar of this alloy exhibited a creep saturation phenomenon at 200℃ under lower stress. The creep limit is 561 MPa for 1 000 h and 01% residual strain. The endurance strength is 77963 MPa for 1 000 h. The creep saturation phenomenon and the endurance strength property of this alloy, which are not related to test time, are caused by deformation strengthening.[HT5”H〗