钨对TiH2粉末冶金高温钛合金高温塑性的影响

Effect of Tungsten on High Temperature Plasticity of High Temperature Titanium Alloy by TiH Powder Metallurgy

采用氢化钛为原料粉末冶金法制备高温钛合金,探究在变形温度为750~900℃、变形量为50%、应变速率为0.1 s-1和1 s-1的压缩条件下,不同钨含量对高温钛合金高温塑性的影响。结果表明,合金在高温压缩后整体组织类似于网篮组织,α相片层间距明显减少,晶粒有所细化,应变速率较低时(0.1 s-1),钨可提高合金的流变应力。当钨含量为0.5%时,合金最大流变应力为423.1 MPa;当应变速率较高时(1 s-1),随着钨含量的增加,其流变应力先增加后减少,当钨含量为0.5%时,合金流变应力最大为505 MPa。

In this paper,titanium hydride(TiH2) was used as raw material to prepare high-temperature titanium alloys by powder metallurgy.The effect of tungsten content on high temperature plasticity of the prepared Ti alloy was explored at deformation temperature of 750~900 °C,deformation amount of 50%,and strain rate of 0.1 s-1 and 1 s-1.The results show that the overall structure of the alloy after high-temperature compression is similar to the mesh basket structure with the layer spacing of α phase significantly reduced,and the grain is refined.When the strain rate is low(0.1 s-1),tungsten can increase the flow stress of the alloy.At the tungsten content of 0.5%,the maximum flow stress of the alloy is 423.1 MPa.When the strain rate is higher(1 s-1),the flow stress increases first and then decreases as the tungsten content increases.At the tungsten content of 0.5%,the maximum alloy flow stress is 505 MPa.