中温高强TC11和TC19钛合金锻件组织与性能研究

Research on Microstructure and Performance of Medium Temperature and High Strength TC11 and TC19 Titanium Alloy Forgings

针对航空发动机压气机整体叶盘等部件所使用的TC11、TC192种中温高强钛合金锻件,基于其各自典型使用状态,开展了组织形貌和不同条件下拉伸性能、冲击韧度以及保载/无保载条件下低周疲劳性能的对比分析研究。结果表明:TC11钛合金锻件呈现典型的双态组织,TC19钛合金锻件呈现全片层网篮组织;TC19钛合金锻件在100~400℃下的拉伸强度明显优于TC11钛合金锻件。TC19钛合金锻件的高温缺口冲击韧度值明显高于TC11钛合金锻件,在100℃和855MPa峰值应力载荷下,TC19钛合金锻件的保载和无保载疲劳寿命均明显高于TC11钛合金锻件,且2种合金均存在一定的保载效应。

For two kinds of medium temperature and high strength titanium alloy forgings of TC11 and TC19 used in the integral leaf disc and other components of aviation engine compressor,the microstructure and tensile property,impact toughness and low weekly fatigue performance under different conditions were carried out based on their typical using states.The results show that TC11 titanium alloy forged piece presents a typical duplex microstructure,and TC19 titanium alloy forged piece presents a fully layered basket weave structure;the tensile strength of TC19 titanium alloy forged piece at 100~400℃is significantly better than TC11 titanium alloy forged piece.The high temperature notch impact toughness value of TC19 titanium alloy forged piece is significantly higher than that of TC11 titanium alloy forged piece.Under the peak stress load of 100℃and 855 MPa,the load protection and no load protection fatigue life of TC19 titanium alloy forged piece are significantly higher than that of TC11 titanium alloy forged piece,and these alloys both have certain load protection effect.