(1. 北京航空材料研究院，北京 100095；
2. 西安交通大学 材料物理系，西安 710049)
摘 要: 研究TA15钛合金在等温锻造和普通模锻两种条件下大型锻件组织的性能特征和热处理工艺的影响。结果表明：等温锻件的室温强度和冲击韧性高于普通模锻件的；等温锻件的500 ℃高温拉伸与断裂韧性低于普通模锻件的。两种锻件的热处理工艺有以下特点：在900 ℃以前，随退火温度升高，其室温强度增加，达到900 ℃以后室温强度随退火温度升高而降低。500 ℃下的高温拉伸性能随退火温度升高，表现不同，普通模锻件的随退火温度升高而增加，等温锻件的则在870 ℃出现转折现象。等温锻件比普通模锻的组织更细。
关键字: TA15钛合金；大锻件；等温锻造；普通模锻；热处理
（1. Beijing Institute of Aeronautical Materials, Beijing 100095, China;
2. Department of Materials Physics, Xi’an Jiaotong University, Xi’an 710049, China）
Abstract:The microstructure and properties of large forgings by isothermal forging and common forging of TA15 titanium alloy before and after heat treatment were studied. The results show that the tensile strength and impact toughness of isothermal forgings at room temperature are higher than those of common forgings, but they are conversed on fracture toughness and tensile strength at 500 ℃. Tensile strength at room temperature increases with increasing annealing temperature before 900 ℃ for large forging, and then decrease with increasing temperature after 900 ℃. Tensile strength at 500 ℃ is different for isothermal forgings and common forgings. The tensile strength at 500 ℃ increases with increasing annealing temperature for common forgings, but increases and then decreases with the temperature increasing for isothermal forgings, and the peak value occurs at 870 ℃. The microstructure of isothermal forgings is finer than that of common forgings.
Key words: TA15 titanium alloy; large forging; isothermal forging; common forging; heat treatment
