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

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

1.
南京航空航天大学能源与动力学院，南京 210016
2.
江苏奇纳新材料科技有限公司，江苏宿迁 223802

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
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- 文章访问数: 23
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- 被引次数: 0
出版历程
- 收稿日期: 2022-06-12
- 网络出版日期: 2023-12-25

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

1.
College of Energy and Power Engineering，Nanjing University of Aeronautics and Astronautics，Nanjing 210016，China
2.
Jiangsu Qina New Materials Technology Company，Limited，Suqian Jiangsu 223802，China

摘要

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。
- 高温疲劳 /
- GH4169合金 /
- 电子束焊接头 /
- 疲劳寿命预测模型 /
- 疲劳损伤机理
Abstract:
In order to establish the high-temperature fatigue life prediction model of GH4169 electron beam welded joints, fatigue tests at different temperatures were carried out to obtain the stress-life (S-N) curves respectively. The influence of temperature on the fatigue performance of joints was analyzed. The fatigue damage mechanism was studied by metallographic analysis and scanning electron microscope (SEM) test. The results showed that the effect of temperature on the fatigue performance of the joint was related to the load level. Under the load above 980 MPa, the fatigue performance showed an obviously downward trend with the increase of temperature. In addition, the fracture mechanism of joints presented transgranular brittle fracture at room temperature and cleavage fracture at high-temperature. On the basis of the above analysis, considering the changes of yield strength and grain size with temperature, the parameters in Basquin model were modified in combination with fatigue test data, and the high-temperature fatigue life prediction model of welded joints was established. The results showed that the prediction accuracy of the modified model was high when the yield strength and grain size were considered comprehensively, while the accuracy of the model was within 2 times of the dispersion band.
- high-temperature fatigue /
- GH4169 alloy /
- electron beam welding joint /
- fatigue life prediction model /
- fatigue damage mechanism

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图 1 高温疲劳试验件（单位：mm）

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

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图 2 不同温度下接头S-N曲线

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

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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

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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）

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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）

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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)

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图 7 屈服强度与温度的关系

Figure 7. Relationship between yield strength and temperature

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图 8 考虑屈服强度影响的系数a（T）、b（T）和温度的关系

Figure 8. Relationship between coefficients a（T） and b（T） and temperature considering effect of yield strength

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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

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图 10 考虑晶粒尺寸和屈服强度影响的系数a（T）、b（T）和温度的关系

Figure 10. Relationship between coefficients a（T） and b（T） and temperature considering grain size and yield strength

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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

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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

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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

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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

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表 4 不同温度对应的系数a（T）和b（T）

Table 4. Coefficients a（T） and b（T） corresponding to different temperatures

T/K	系数a（T）	系数b（T）
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

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