铝合金中厚板焊接接头显微组织及其疲劳损伤
Microstructure and fatigue damage of welded joint of aluminum alloy medium plate
摘 要
采用熔化极惰性气体保护焊焊接了厚度为12 mm的7N01-T5铝合金板，分析了焊接接头的显微组织，并对焊接接头进行了拉伸及疲劳试验。用能谱分析法确定了疲劳条带间的二次相为含Fe相，提出了一种二次相所致的疲劳微裂纹萌生模型，解释了在疲劳条带间第二相处的微裂纹萌生原因。结果表明：焊接接头的抗拉强度为259 MPa，延伸率为11.4%，接头的拉伸断裂形式为韧性断裂和脆性断裂混合形式；二次相导致的微裂纹会加快疲劳裂纹的扩展速率。
熔化极惰性气体保护焊
显微组织
疲劳性能
aluminum alloy
MIG welding
microstructure
fatigue fracture
Abstract
7N01-T5 aluminum alloy plates with thickness of 12 mm were welded by MIG welding. The microstructure of the welded joints were analyzed, and the tensile and fatigue tests were carried out. The secondary phase between fatigue strips was determined to be Fe-containing by energy spectrum analysis. A fatigue micro-crack initiation model caused by secondary phase was proposed, and the causes of micro-crack initiation at the second phase between fatigue strips were explained. The results show that the tensile strength of the welded joint was 259 MPa and the elongation was 11.4%. The tensile fracture form of the joint was a mixture of ductile fracture and brittle fracture. The micro-cracks caused by secondary phase would accelerate the propagation rate of fatigue cracks.
中图分类号 TG453 TG115.5 DOI 10.11973/lhjy-wl202202008
所属栏目 试验与研究
基金项目 国家自然科学基金资助项目(51971129); 上海市自然科学基金资助项目(19ZR1421200)
收稿日期 2021/4/13
修改稿日期
网络出版日期
作者单位点击查看
备注范聪(1996-),男,硕士,主要从事铝合金焊接性能方面的研究
引用该论文: FAN Cong,YANG Shanglei,BAI Yishan,ZHU Minqi. Microstructure and fatigue damage of welded joint of aluminum alloy medium plate[J]. Physical Testing and Chemical Analysis part A:Physical Testing, 2022, 58(2): 30～35
范聪,杨尚磊,白易山,朱敏琪. 铝合金中厚板焊接接头显微组织及其疲劳损伤[J]. 理化检验－物理分册, 2022, 58(2): 30～35
共有人对该论文发表了看法，其中：
人认为该论文很差
人认为该论文较差
人认为该论文一般
人认为该论文较好
人认为该论文很好
参考文献
【1】YAN S H, CHEN H, MA C P, et al. Local corrosion behaviour of hybrid laser-MIG welded Al-Zn-Mg alloy joints[J]. Materials & Design, 2015, 88:1353-1365.
【2】宫柏山.7XXX系铝合金疲劳性能优化研究[D].沈阳:沈阳工业大学, 2019.
【3】LI S, DONG H G, WANG X X, et al. Effect of repair welding on microstructure and mechanical properties of 7N01 aluminum alloy MIG welded joint[J]. Journal of Manufacturing Processes, 2020, 54:80-88.
【4】JIAN H G, LUO J, OU L, et al. Micro-morphology of fatigue crack initiation and propagation behavior in high strength aluminum alloy[J]. Materials Science and Engineering:A, 2017, 684:213-221.
【5】倪维源, 杨尚磊, 贾进, 等.高速列车用高强A7N01铝合金焊接接头的组织与性能[J].热加工工艺, 2014, 43(19):22-25.
【6】晁耀杰, 李宏佳, 李钦杰.A7N01铝合金焊接接头组织对疲劳断裂的影响[J].焊接技术, 2017, 46(8):5-9.
【7】侯艳喜, 罗子艺, 易耀勇, 等.A7N01铝合金激光-MIG复合焊接焊缝成形与组织性能研究[J].激光技术, 2020, 44(3):304-309.
【8】顾佳星, 杨尚磊, 段晨风, 等.两侧分别单、双道MIG焊接A7N01铝合金T形接头的显微组织与性能[J].机械工程材料, 2019, 43(4):59-63.
【9】王金达.7N01高强铝合金双丝MIG焊工艺及焊缝组织性能研究[D].沈阳:沈阳航空航天大学, 2019.
【10】石峰, 王煜, 叶朋飞, 等.时效制度对A7N01铝合金车体型材性能的影响[J].铝加工, 2010(5):29-31.
【11】LIU H B, YANG S L, XIE C J, et al. Microstructure characterization and mechanism of fatigue crack initiation near pores for 6005A CMT welded joint[J]. Materials Science and Engineering:A, 2017, 707:22-29.
【12】JIAN H G, WANG Y D, YANG X M, et al. Microstructure and fatigue crack growth behavior in welding joint of Al-Mg alloy[J]. Engineering Failure Analysis, 2021, 120:105034.
【13】束德林.工程材料力学性能[M].北京:机械工业出版社, 2016.
【14】倪维源.高速列车用7XXX系高强铝合金焊接接头的疲劳行为研究[D].上海:上海工程技术大学, 2015.
【15】农琪, 谢业东.Al-Mg-Si铝合金6061焊接接头组织软化与强化机理[J].热加工工艺, 2012, 41(9):148-150.
【16】钟群鹏, 赵子华.断口学[M].北京:高等教育出版社, 2006.
【17】LIN S, DENG Y L, TANG J G, et al. Microstructures and fatigue behavior of metal-inert-gas-welded joints for extruded Al-Mg-Si alloy[J]. Materials Science and Engineering:A, 2019, 745:63-73.
【18】DUAN C F, YANG S L, LIU H B, et al. Formation and fatigue property of MIG welded high-speed train 6005A-T6 aluminum alloy[J]. Materials Research Express, 2019, 6(5):056532.
【2】宫柏山.7XXX系铝合金疲劳性能优化研究[D].沈阳:沈阳工业大学, 2019.
【3】LI S, DONG H G, WANG X X, et al. Effect of repair welding on microstructure and mechanical properties of 7N01 aluminum alloy MIG welded joint[J]. Journal of Manufacturing Processes, 2020, 54:80-88.
【4】JIAN H G, LUO J, OU L, et al. Micro-morphology of fatigue crack initiation and propagation behavior in high strength aluminum alloy[J]. Materials Science and Engineering:A, 2017, 684:213-221.
【5】倪维源, 杨尚磊, 贾进, 等.高速列车用高强A7N01铝合金焊接接头的组织与性能[J].热加工工艺, 2014, 43(19):22-25.
【6】晁耀杰, 李宏佳, 李钦杰.A7N01铝合金焊接接头组织对疲劳断裂的影响[J].焊接技术, 2017, 46(8):5-9.
【7】侯艳喜, 罗子艺, 易耀勇, 等.A7N01铝合金激光-MIG复合焊接焊缝成形与组织性能研究[J].激光技术, 2020, 44(3):304-309.
【8】顾佳星, 杨尚磊, 段晨风, 等.两侧分别单、双道MIG焊接A7N01铝合金T形接头的显微组织与性能[J].机械工程材料, 2019, 43(4):59-63.
【9】王金达.7N01高强铝合金双丝MIG焊工艺及焊缝组织性能研究[D].沈阳:沈阳航空航天大学, 2019.
【10】石峰, 王煜, 叶朋飞, 等.时效制度对A7N01铝合金车体型材性能的影响[J].铝加工, 2010(5):29-31.
【11】LIU H B, YANG S L, XIE C J, et al. Microstructure characterization and mechanism of fatigue crack initiation near pores for 6005A CMT welded joint[J]. Materials Science and Engineering:A, 2017, 707:22-29.
【12】JIAN H G, WANG Y D, YANG X M, et al. Microstructure and fatigue crack growth behavior in welding joint of Al-Mg alloy[J]. Engineering Failure Analysis, 2021, 120:105034.
【13】束德林.工程材料力学性能[M].北京:机械工业出版社, 2016.
【14】倪维源.高速列车用7XXX系高强铝合金焊接接头的疲劳行为研究[D].上海:上海工程技术大学, 2015.
【15】农琪, 谢业东.Al-Mg-Si铝合金6061焊接接头组织软化与强化机理[J].热加工工艺, 2012, 41(9):148-150.
【16】钟群鹏, 赵子华.断口学[M].北京:高等教育出版社, 2006.
【17】LIN S, DENG Y L, TANG J G, et al. Microstructures and fatigue behavior of metal-inert-gas-welded joints for extruded Al-Mg-Si alloy[J]. Materials Science and Engineering:A, 2019, 745:63-73.
【18】DUAN C F, YANG S L, LIU H B, et al. Formation and fatigue property of MIG welded high-speed train 6005A-T6 aluminum alloy[J]. Materials Research Express, 2019, 6(5):056532.
相关信息
