铸造技术2018，Vol.39Issue(1)：120-123,136,5.DOI:10.16410/j.issn1000-8365.2018.01.032
焊后热处理对AZ31B镁合金自动TIG焊焊接接头的影响
Influence of Post-welded Heat Treatment on the Auto-TIG Welding Joints of AZ31B Magnesium Alloy
摘要
Abstract
The auto-TIG butt welding on the AZ31 magnesium alloy was performed by the six-axis robot in the present work.After post-welded heat treated (PWHT),the microstructure,second phase and mechanical properties of the AZ31B joints was investigated by using the optical microscope,scanning electron microscopy,energy-dispersive X-ray spectroscopy,and X-ray diffraction.The results show that after PWHT,the microstructure and mechanical properties of the AZ31B joints are both significantly improved.After PWHT,the grains of the AZ31B joints are still fine,whereas the number of the precipitates along with the grain boundaries is dramatically decreased.The ultimate tensile strength and elongation of the PWHT AZ31B joints are up to 97.8％ and 84.5％ of the base allay,respectively.The fracture surface of the untreated tensile specimen is brittle fracture,whereas the PWHT tensile specimen exhibit obvious ductile-brittle mixed facture,which is characterized by more dimples and small cleavage surfaces.关键词
AZ31B镁合金/自动TIG焊接/焊后热处理/β-Mg17Al12/力学性能Key words
AZ31B magnesium alloy/auto-TIG welding/post-welded heat treatment (PWHT)/β-Mg17Al12/mechanical properties分类
矿业与冶金引用本文复制引用
焦学兵,李长龙,周吉学,刘洪涛..焊后热处理对AZ31B镁合金自动TIG焊焊接接头的影响[J].铸造技术,2018,39(1):120-123,136,5.基金项目
国家重点研发计划(2016YFB0301105)资助项目 （2016YFB0301105）
山东省重点研发计划(2016ZDJS02A09)资助项目 （2016ZDJS02A09）
山东省科学院青年基金(2016QN015)资助项目 （2016QN015）
