(北京航空材料研究院，北京 100095)
摘 要: 采用金相显微镜观察新型抗疲劳低成本钛合金双重退火和普通退火后的显微组织，测试合金的拉伸性能、断裂韧性和疲劳性能等力学性能。结果表明：与普通退火相比，双重退火可以使组织均匀化更加充分，并可通过调整第一重退火温度来获得网篮组织和片层组织。网篮组织具有更好的强度和塑性匹配，随着第一重退火温度的升高，其强度降低、塑性升高；片层组织强度和塑性较低，但抗疲劳性能更加突出。合金采用普通退火获得的网篮组织具有良好的强度-塑性-韧性-疲劳性能匹配，并且随着退火温度的升高，强度和疲劳极限降低，但其组织均匀性有待进一步提高。
关键字: 抗疲劳钛合金；双重退火；普通退火；显微组织；力学性能
（Beijing Institute of Aeronautical Materials, Beijing 100095, China）
Abstract:The microstructures of a new fatigue resistance and low cost titanium alloy by double annealing and single annealing were investigated and the mechanical properties such as tensile, fracture toughness and fatigue property were studied. The results show that double annealing is better than single annealing in favor of the homogeneity of microstructure. Basket-weave microstructure and lamellar microstructure can be obtained by adjusting the temperature of the first step annealing. The matching of strength and ductility for basket-weave microstructure is better, in addition, the strength decreases and the plastic increases with increasing temperature of the first step annealing. The fatigue property for lamellar microstructure is higher than basket-weave microstructure, but the strength and ductility are a litter lower. Basket-weave microstructure which can be obtained after single annealing has a better matching of strength, plastic, fracture toughness and fatigue property, in addition, the strength and fatigue property decrease with increasing annealing temperature, however, the homogeneity of microstructure should be further improved.
Key words: fatigue resistance titanium alloy; double annealing; single annealing; microstructure; mechanical properties
