锻压技术

WSTi3515S阻燃钛合金热暴露性能

英文标题：Heat exposure property of burn-resistant titanium alloy WSTi3515S

分类号：TG146.2+3

出版年,卷(期):页码：2017,42(5):147-151

摘要：

对WSTi3515S合金板坯试样进行550 ℃/100 h/AC热暴露试验后，分别在室温和100 ℃下测试其拉伸性能；未经过热暴露的试样，分别在从室温到550 ℃的不同温度点测试了其拉伸性能。结果表明：经过热暴露后的试样，受到析出相强化的作用，强度略有提高，但塑性指标均存在明显下降，其中，100 ℃时的拉伸强度低于室温拉伸性能，塑性有所提高，但仍比未经过热暴露的试样测试结果低；热暴露时，晶界处析出第二相是WSTi3515S合金的关键特征，也是WSTi3515S合金热稳定性能降低的原因；在试验温度提高的情况下，光滑拉伸试样强度不断降低，塑性先上升后降低；缺口拉伸试样强度持续下降，塑性没有明显变化，弹性模量持续下降。

The tensile properties of alloy WSTi3515S slab samples were tested at room temperature and 100 ℃ after 550 ℃/100 h/AC heat exposure test. The tensile properties were tested at different temperatures from room temperature to 550 ℃ without heat exposure test. The results show that by the precipitation strengthening effect, the tensile strength of sample after heat exposure is slightly improved, but the plasticity is obviously decreased. However, the tensile strength at 100 ℃ is lower than that at room temperature, and the plasticity is higher. But it is still lower than the sample without heat exposure test. Furthermore, during heat exposure test, the second phase precipitated at grain boundary is the key feature of alloy WSTi3515S. It is also the reason for the decrease of the thermal stability of alloy WSTi3515S. Under improving the test temperature, the strength of the smooth tensile specimen decreases and the plasticity increases first and then decreases, while the strength of the notched tensile specimen decreases continually, the plasticity does not change obviously, and the elastic modulus decreases continually.

基金项目：

陕西省科技统筹创新工程计划（2016KTCQ01-100）；陕西省科技统筹创新工程计划（2016KTCQ01-81）

马凡蛟（1985-），男，硕士，工程师

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