文章信息/Info

Title:

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

作者:

魏鑫; 趙興東; 李昌永; 王健妍

中國航發沈陽黎明航空發動機有限責任公司

Author(s):

WEI Xin ;  ZHAO Xingdong ;  LI Changyong ;  WANG Jianyan

AECC Shen Yang Li Ming Aero-engine CO.,LTO.

關鍵詞:

熱處理; TC4鈦合金; 風扇盤; 組織; 力學性能

Keywords:

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

DOI:

10.7502/j.issn.1674-3962.2017.07.13

文獻標志碼:

A

摘要:

隨著國產大飛機及其發動機的自主研制，TC4鈦合金被用來制造發動機風扇盤，該風扇盤鍛件尺寸大、結構復雜，且為工作時承受很大載荷的轉動件，對TC4鈦合金鍛件綜合力學性能要求苛刻。為提高風扇盤鍛件的組織與力學性能水平，需要對其熱處理工藝進行系統的研究。研究了不同熱處理制度對TC4鈦合金風扇盤鍛件組織和性能的影響。采用光學顯微鏡分析了鍛件的顯微組織，測試了鍛件的拉伸性能、斷裂韌度和應變控制的低周疲勞性能等力學性能。試驗結果表明：與普通退火相比，固溶時效處理后具有更好的組織均勻性和綜合力學性能；固溶溫度升高，室溫、400 ℃拉伸強度增加，但室溫應變控制的低周疲勞性能和斷裂韌度稍微有所降低；固溶后的冷卻速率增加，室溫、400 ℃拉伸強度增加，室溫應變控制的低周疲勞性能和斷裂韌度稍微降低；TC4鈦合金風扇盤鍛件最佳的熱處理制度為Tβ(40~60) ℃/2 h, WQ+700 ℃/2 h, AC。

Abstract:

With the independent development of China�瞞ade 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.