热处理制度对TC4钛合金风扇盘组织和性能的影响研究-中国材料进展

文章信息/Info

Title:: Effects of Heat Treatment on Microstructure and Mechanical Properties for TC4 Fan Disk

Author(s):: WEI Xin ; ZHAO Xingdong ; LI Changyong ; WANG Jianyan; AECC Shen Yang Li Ming Aero-engine CO.,LTO.

Keywords:: heat treatment; TC4; fan disk; microstructure; mechanical property

摘要:: 随着国产大飞机及其发动机的自主研制，TC4钛合金被用来制造发动机风扇盘，该风扇盘锻件尺寸大、结构复杂，且为工作时承受很大载荷的转动件，对TC4钛合金锻件综合力学性能要求苛刻。为提高风扇盘锻件的组织与力学性能水平，需要对其热处理工艺进行系统的研究。研究了不同热处理制度对TC4钛合金风扇盘锻件组织和性能的影响。采用光学显微镜分析了锻件的显微组织，测试了锻件的拉伸性能、断裂韧度和应变控制的低周疲劳性能等力学性能。试验结果表明：与普通退火相比，固溶时效处理后具有更好的组织均匀性和综合力学性能；固溶温度升高，室温、400 ℃拉伸强度增加，但室温应变控制的低周疲劳性能和断裂韧度稍微有所降低；固溶后的冷却速率增加，室温、400 ℃拉伸强度增加，室温应变控制的低周疲劳性能和断裂韧度稍微降低；TC4钛合金风扇盘锻件最佳的热处理制度为Tβ(40~60) ℃/2 h, WQ+700 ℃/2 h, AC。

Abstract:: With the independent development of Chinamade large aircrafts and engines, TC4 titanium alloy is adopted to manufacture engine fan disks, which have high requirements on comprehensive mechanical properties of TC4 fan disk owing to the large forging size, complex structure, and rotating under high load during work. In order to improve the microstructure and mechanical properties of fan disk forgings, it is necessary to conduct systematical study on heat treatment processes. The effects of different heat treatment processes on microstructure and mechanical properties of TC4 titanium alloy fan disk forging were studied. Microstructures of the fan disk forging were observed using optical microscopy. The mechanical properties of the fan disk forging were evaluated. The results show that compared with annealing, solution+aging treatment makes better microstructure uniformity and comprehensive mechanical performances. The tensile strengths at room temperature and 400℃ are improved, however, facture toughness and strain controlled low cycle fatigue life at room temperature are decreased with increasing solution temperature and cooling rate after solution treating. The optimum heat treatment process for fan plate forgings is Tβ(40~60) ℃/2 h, WQ+700 ℃/2 h, AC.