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GH4169电子束焊接头高温疲劳寿命预测模型

刘小刚 李张辉 于盛吉 彭伟平

刘小刚, 李张辉, 于盛吉, 等. GH4169电子束焊接头高温疲劳寿命预测模型[J]. 航空动力学报, 2024, 39(7):20220418 doi: 10.13224/j.cnki.jasp.20220418
引用本文: 刘小刚, 李张辉, 于盛吉, 等. GH4169电子束焊接头高温疲劳寿命预测模型[J]. 航空动力学报, 2024, 39(7):20220418 doi: 10.13224/j.cnki.jasp.20220418
LIU Xiaogang, LI Zhanghui, YU Shengji, et al. High-temperature fatigue life prediction model of GH4169 electron beam welding joint[J]. Journal of Aerospace Power, 2024, 39(7):20220418 doi: 10.13224/j.cnki.jasp.20220418
Citation: LIU Xiaogang, LI Zhanghui, YU Shengji, et al. High-temperature fatigue life prediction model of GH4169 electron beam welding joint[J]. Journal of Aerospace Power, 2024, 39(7):20220418 doi: 10.13224/j.cnki.jasp.20220418

GH4169电子束焊接头高温疲劳寿命预测模型

doi: 10.13224/j.cnki.jasp.20220418
基金项目: 国家科技重大专项(J2019-Ⅳ-0008-0076); 中央高校基本科研业务费(NS2021014)
详细信息
    作者简介:

    刘小刚(1977-),男,副教授,博士,主要从事航空发动机结构强度与疲劳寿命预测等方面的研究

  • 中图分类号: V231.95

High-temperature fatigue life prediction model of GH4169 electron beam welding joint

  • 摘要:

    为建立GH4169电子束焊接头的高温疲劳寿命预测模型,开展了电子束焊接头多个温度下的疲劳试验,获得其不同温度下的应力-寿命(S-N)曲线,分析了温度对接头疲劳性能的影响规律。对疲劳断口进行金相分析和扫描电镜(SEM)观测,研究其高温疲劳损伤机理。结果表明,温度对接头疲劳性能的影响与载荷水平有关,当应力水平大于980 MPa时,随温度升高,接头的疲劳性能呈现明显的下降趋势;此外,接头室温下为穿晶脆性断裂,而高温下呈现出解理断裂特征。在上述分析基础上,考虑屈服强度及晶粒尺寸随温度的变化,结合疲劳试验数据对Basquin模型中材料参数进行修正,建立电子束焊接头高温疲劳寿命预测模型。结果表明:当仅考虑屈服强度因素对参数进行拟合,模型的预测精度较低,而综合考虑屈服强度及晶粒尺寸的影响,修正后的模型预测精度较高,其误差在±2倍分散带以内。

     

  • 图 1  高温疲劳试验件(单位:mm)

    Figure 1.  Fatigue test piece under high-temperature (unit:mm)

    图 2  不同温度下接头S-N曲线

    Figure 2.  S-N curves of joints at different temperatures

    图 3  不同温度热影响区的金相组织

    Figure 3.  Metallographic structure of heat affected zone at different temperatures

    图 4  不同温度下试件疲劳源区高倍断口形貌(×100)

    Figure 4.  Fracture morphology of fatigue source at different temperatures (×100)

    图 5  不同温度下试件疲劳源区高倍断口形貌(×1000)

    Figure 5.  Fracture morphology of fatigue source at different temperatures (×1000)

    图 6  不同温度下试件裂纹扩展区高倍断口形貌(×1000)

    Figure 6.  Fracture morphology of crack propagation zone at different temperatures (×1000)

    图 7  屈服强度与温度的关系

    Figure 7.  Relationship between yield strength and temperature

    图 8  考虑屈服强度影响的系数aT)、bT)和温度的关系

    Figure 8.  Relationship between coefficients aT) and bT) and temperature considering effect of yield strength

    图 9  考虑屈服强度影响的Basquin模型寿命预测分散带

    Figure 9.  Scatter band of Basquin model life prediction considering effect of yield strength

    图 10  考虑晶粒尺寸和屈服强度影响的系数aT)、bT)和温度的关系

    Figure 10.  Relationship between coefficients aT) and bT) and temperature considering grain size and yield strength

    图 11  考虑晶粒尺寸和屈服强度影响的Basquin模型疲劳寿命预测分散带

    Figure 11.  scatter band of Basquin model fatigue life prediction considering grain size and yield strength

    表  1  电子束焊工艺参数

    Table  1.   Parameters of electron beam welding process

    设备型号 真空度/
    10−2 Pa
    电压/
    kV
    工作距离/
    mm
    扫描频率/
    Hz
    ZComple X3 5 60 245 400
    下载: 导出CSV

    表  2  热处理工艺参数

    Table  2.   Parameters of heat treatment process

    工艺 加热温度/K 保温时间/h 冷却方式
    固溶处理 687 1 空冷
    时效处理 447 8 空冷
    下载: 导出CSV

    表  3  不同温度下的静强度参数

    Table  3.   Static strength parameters at different temperatures

    参数 数值
    T/K 298 573 773 923
    $ {\sigma _{\text{b}}} $/MPa 1391 1352 1255 1221
    $ {\sigma _{\text{s}}} $/MPa 1274 1253 1172 1091
    下载: 导出CSV

    表  4  不同温度对应的系数aT)和bT

    Table  4.   Coefficients aT) and bT) corresponding to different temperatures

    T/K 系数aT 系数bT
    298 3.8412 0.1637
    3.8541 0.1692
    3.8419 0.1625
    573 3.6669 0.1328
    3.7013 0.1305
    3.6121 0.1355
    773 3.7931 0.1597
    3.7251 0.1552
    3.7453 0.1588
    923 3.4994 0.0910
    3.5214 0.1005
    3.5126 0.1099
    下载: 导出CSV
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  • 收稿日期:  2022-06-12
  • 网络出版日期:  2023-12-25

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