5754铝合金钨极氩弧焊和搅拌摩擦焊接头的疲劳性能及断裂机理
Fatigue Property and Fracture Mechanism of 5754 Aluminum Alloy GTAW and FSW Joints
摘 要
分别采用钨极氩弧焊（GTAW）和搅拌摩擦焊（FSW）对10 mm厚5754铝合金进行双面同步焊接，对比研究了应力幅为162，135，117，108，99 MPa时焊接接头的疲劳性能，并对其疲劳断裂机理进行了分析。结果表明：在指定应力幅下，5754铝合金GTAW接头的疲劳强度明显高于FSW接头的，在50%和95%存活率下，GTAW接头的疲劳强度特征值比FSW接头的分别提高了27%和30%，GTAW接头的疲劳性能优于FSW接头的；GTAW接头与FSW接头的疲劳断裂机理基本相同，疲劳裂纹均起源于接头熔合区的外表面，随着应力幅的降低，疲劳裂纹扩展区在断口中的占比增加，且同等应力幅下GTAW接头疲劳裂纹扩展区的占比高于FSW接头的；同等应力幅下GTAW接头的疲劳辉纹间距比FSW接头的小，GTAW接头的疲劳寿命长于FSW接头的。
焊接接头
疲劳性能
断裂机理
5754 aluminum alloy
welded joint
fatigue property
fracture mechanism
Abstract
5754 aluminum alloy with thickness of 10 mm was welded by gas tungsten arc welding (GTAW) and friction stir welding (FSW) using a double-sided synchronization welding method. The fatigue property of welded joints at stress amplitudes of 162, 135, 117, 108,99 MPa was compared and studied, and fracture mechanism was analyzed. The results show that the fatigue strength of GTAW joint at given stress amplitudes was obviously larger than that of FSW joint. The fatigue strength eigenvalues at 50% and 95% survival percent of GTAW joint increased by 26.3% and 24.4%, respectively, compared with those of FSW joint, indicating that the fatigue property of GTAW joint was better than that of FSW joint. The fatigue failure mechanism of GTAW and FSW joints was almost the same. The fatigue cracks all initiated at the outer surface of fusion zone of joints. With the decrease of stress amplitude, the proportion of the fatigue crack propagation zone increased. At the same stress amplitude, the proportion of crack propagation zone of GTAW joint was larger than that of FSW joint. The spacing of fatigue striations in GTAW joint was narrower, indicating that the fatigue life of GTAW joint was larger than that of FSW joint.
中图分类号 TG115.21 DOI 10.11973/jxgccl201910007
所属栏目 材料性能及应用
基金项目 国家电网公司特高压GIL科研专项项目
收稿日期 2018/8/8
修改稿日期 2019/8/13
网络出版日期
作者单位点击查看
备注乔亚霞(1977-),女,山西运城人,高级工程师,硕士
引用该论文: QIAO Yaxia,ZHAO Lei,XU Lianyong,ZHANG Hao,ZHANG Pengfei,HAN Yongdian. Fatigue Property and Fracture Mechanism of 5754 Aluminum Alloy GTAW and FSW Joints[J]. Materials for mechancial engineering, 2019, 43(10): 30～34
乔亚霞,赵雷,徐连勇,张浩,张鹏飞,韩永典. 5754铝合金钨极氩弧焊和搅拌摩擦焊接头的疲劳性能及断裂机理[J]. 机械工程材料, 2019, 43(10): 30～34
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【7】陈超, 余朗, 陈玉华, 等. 铝合金超声辅助搅拌摩擦焊接接头组织性能研究[J]. 精密成形工程, 2018, 10(5):33-37.
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【9】余爱武, 宿国友, 张春峰, 等. 铝合金螺旋管FSW焊与纵缝管熔焊组织及力学性能对比[J].电焊机,2018,48(8):48-52.
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