吉林大学学报(工学版) ›› 2026, Vol. 56 ›› Issue (3): 670-680.doi: 10.13229/j.cnki.jdxbgxb.20240807

• 材料科学与工程 • 上一篇    

热处理温度对激光沉积修复TA15高温疲劳性能的影响

丛家慧1,2(),朱旭阳1,2,周松1,3(),高首龙1,2,刘卓1,2   

  1. 1.沈阳航空航天大学 机电工程学院，沈阳 110136
    2.飞行器快速试制技术研究教育部重点实验室，沈阳 110136
    3.沈阳飞机设计研究所，沈阳 110035
  • 收稿日期:2024-07-18 出版日期:2026-03-01 发布日期:2026-03-31
  • 通讯作者: 周松 E-mail:congjiahui2011@163.com;zhousong23@163.com
  • 作者简介:丛家慧（1980-），女，副教授，博士. 研究方向：航空材料表面强化. E-mail： congjiahui2011@163.com
  • 基金资助:
    国家自然科学基金项目(52105157);中国博士后科学基金项目(2023MD734242);辽宁省教育厅重点攻关项目(JYTZD2023007)

Effect of heat treatment temperature on high temperature fatigue properties of TA15 repaired by laser deposition

Jia-hui CONG1,2(),Xu-yang ZHU1,2,Song ZHOU1,3(),Shou-long GAO1,2,Zhuo LIU1,2   

  1. 1.School of Mechanical and Electrical Engineering，Shenyang Aerospace University，Shenyang 110136，China
    2.Key Laboratory of Rapid Development & Manufacturing Technology for Aircraft（Shenyang Aerospace University），Ministry of Education，Shenyang 110136，China
    3.Shenyang Aircraft Design and Research Institute，Shenyang 110135，China
  • Received:2024-07-18 Online:2026-03-01 Published:2026-03-31
  • Contact: Song ZHOU E-mail:congjiahui2011@163.com;zhousong23@163.com

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摘要：

本文研究了TA15钛合金激光沉积修复件经不同温度热处理后，在500 ℃服役条件下不同应力的高温疲劳性能，分析了其组织演变对疲劳寿命的影响。结果表明：热处理为900 ℃与950 ℃时，母材初生α相含量减少，次生α生长变粗，热影响区组织由过渡组织向网篮组织转变。当热处理温度达到1 000 ℃时，α相转变为高温β相，再结晶形成极细的β晶粒。3种热处理温度下1 000 ℃试样的高温疲劳寿命最长，高应力下900 ℃试样与1 000 ℃试样的高温疲劳寿命相差不大，950 ℃试样高温疲劳寿命在高、低应力下均短于其他两组。根据断口分析，1 000 ℃试样疲劳裂纹主要为穿过α相扩展，消耗大量能量，造成其高温疲劳寿命相比其他两种热处理温度更长。

关键词: TA15钛合金, 激光沉积修复, 热处理, 显微组织, 高温疲劳性能

Abstract:

This paper investigates the high-temperature fatigue performance of TA15 titanium alloy laser-deposited repairs under different stress levels at 500 ℃ after heat treatment at various temperatures， analyzing the impact of microstructural evolution on fatigue life. The results show that when heat-treated at 900 ℃and 950 ℃， the content of the primary α phase in the base material decreases， the secondary α phase coarsens， and the microstructure in the heat-affected zone transitions from a transitional structure to a basket-weave structure. When the heat treatment temperature reaches 1 000 ℃， the α phase transforms into the high-temperature β phase， and recrystallization results in the formation of extremely fine β grains. Among the three heat treatment temperatures， the specimen treated at 1 000 ℃ exhibited the longest high-temperature fatigue life. Under high stress， the fatigue life of the specimens treated at 900 ℃ and 1 000 ℃ was comparable， while the specimen treated at 950 ℃ showed shorter high-temperature fatigue life under both high and low stress conditions compared to the other two groups. Fractographic analysis indicated that in the 1 000 ℃ specimen， fatigue cracks predominantly propagated through the α phase， consuming significant energy， which contributed to its longer high-temperature fatigue life compared to the other two heat treatment conditions.

Key words: TA15 titanium alloy, laser deposition repair, heat treatment, microstructure, high temperature fatigue property

中图分类号: 

  • TG405

表1

TA15球形粉末化学成分"

成分含量成分含量
Al6.62Si0.02
V2.13C0.01
Zr2.10N0.01
Mo1.67H0.003
O0.11Ti余量
Fe0.04

图1

沉积修复加工示意图"

图2

不同温度热处理后的金相组织"

图3

不同温度热处理后的金相转变图"

图4

不同热处理温度下的拉伸性能"

图5

高、低应力高温疲劳寿命对比柱状图"

表2

490 MPa应力下的高温疲劳寿命统计参数"

试样类型对数寿命平均值/xˉ标准差/S子样变异系数/Cv中值疲劳寿命/N50试样个数/n
900 ℃4.809 0590.072 4420.015 06364 4266
950 ℃4.524 4020.062 4520.013 80333 4516
1 000 ℃5.105 1960.049 1830.009 634127 4086

表3

550 MPa应力下的高温疲劳寿命统计参数"

试样类型对数寿命平均值/xˉ标准差/S子样变异系数/Cv中值疲劳寿命/N50试样个数/n
900 ℃4.460 2250.063 2470.014 18028 8556
950 ℃4.213 4280.025 5610.006 06616 3476
1 000 ℃4.440 0900.085 6270.019 28527 5486

图6

高应力高温疲劳断口萌生区"

图7

低应力高温疲劳断口萌生区"

图8

高应力高温疲劳断口的扩展区"

图9

低应力高温疲劳断口的扩展区"

图10

高应力高温疲劳断口瞬断区"

图11

低应力高温疲劳断口瞬断区"

图12

断口萌生区附近金相组织"

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