Remanufacturing the AA5052 GTAW Welds Using Friction Stir Processing

被引:13
作者
Roeen, Ghasem Azimi [1 ]
Yousefi, Sajjad Ghatei [2 ]
Emadi, Rahmatollah [2 ]
Shooshtari, Mohsen [3 ]
Lotfian, Saeid [4 ]
机构
[1] Isfahan Univ Technol, Ctr Educ Workshops, Esfahan 8415683111, Iran
[2] Isfahan Univ Technol, Dept Mat Engn, Esfahan 8415683111, Iran
[3] Isfahan Univ Technol, Dept Biosyst Engn, Esfahan 8415683111, Iran
[4] Univ Strathclyde, Ocean & Marine Engn Dept, Glasgow G1 1XQ, Lanark, Scotland
基金
英国工程与自然科学研究理事会;
关键词
remanufacturing; grain reinement; friction stir processing; GTAW; 5052 aluminium alloy; AA5052; MECHANICAL-PROPERTIES; ALUMINUM-ALLOY; PULSED CURRENT; FATIGUE LIFE; JOINTS; OPTIMIZATION; IMPROVEMENT; PARAMETERS;
D O I
10.3390/met11050749
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Progress in sustainable manufacturing is a crucial element to minimise negative environmental impacts. The conventional fusion weld process used to join aluminium alloys resulted in coarse grain structure, inevitable defects, and severe joint softening. Friction stir processing (FSP) has the potential to modify the microstructure of materials in joint structure and improve the mechanical properties. In this investigation, the effect of friction stir post-processing was evaluated to study the microstructural characteristics and mechanical properties of GTAW (gas tungsten arc welding) welds in the aluminium 5052 alloy. During FSP, the grains' dendritic microstructure was destroyed, and the dynamic recrystallisation resulted in a very fine and equiaxed grains structure in the fusion zone. The hardness of the friction-stir-processed welds significantly improved because of microstructure grain refinement. The processed joint demonstrated higher ultimate tensile and yield strength (similar to 275 MPa and 221 MPa, respectively) and superior elongation (31.1%) compared to the unprocessed weld; at the same time, the mechanical strength (yield and ultimate tensile) is similar to that of the base metal.
引用
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页数:13
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