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Effect of Sequence of T6 Heat Treatment and Welding on Microstructure and Mechanical Properties of Friction Stir Welding Joints of A356 Al Alloy
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Jia WU1, Zhao YANG1, Gangxian FAN2, Jianqi LU1, Yifan LI1, Lijia TAN1
Mining and Metallurgical Engineering | 2023, 43(6) : 157 - 161
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Mining and Metallurgical Engineering | 2023, 43(6): 157-161
• MATERIALS •
Effect of Sequence of T6 Heat Treatment and Welding on Microstructure and Mechanical Properties of Friction Stir Welding Joints of A356 Al Alloy
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Jia WU1, Zhao YANG1, Gangxian FAN2, Jianqi LU1, Yifan LI1, Lijia TAN1
Affiliations
  • 1.School of Materials Science and Engineering, Central South University, Changsha 410083, Hunan, China
  • 2.Kunshan Liufeng Machinery Industry Co Ltd, Kunshan 215300, Jiangsu, China
Published: 2023-12-01 doi: 10.3969/j.issn.0253-6099.2023.06.034
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The microstructure and mechanical properties of A356 aluminum alloy joints were studied after they were processed with technique of T6 heat treatment followed by friction stir welding (T6-FSW) and technique of friction stir welding followed by T6 heat treatment (FSW-T6) respectively. It is found that the nugget zone of T6-FSW joint is composed of dynamically recrystallized fine-grains, but the precipitates are dissolved or coarsened. The transverse tensile strength and elongation of T6-FSW joint are 214 MPa and 5.3% respectively, and an average hardness is 76HV0.5. The tensile strength and elongation of the nugget zone are 236 MPa and 12.5% respectively, and the impact toughness of the joint is 12.10 J. Abnormal grain growth occurs in the nugget zone of FSW-T6 joint, where fine precipitates with high density are formed. The transverse tensile strength and elongation of FSW-T6 joint are 254 MPa and 8.5% respectively, and an average hardness is 96HV0.5. The tensile strength and elongation of the nugget zone are 297 MPa and 7.0% respectively, and the impact toughness of the joint is 8.23 J.

A356 Al alloy  /  friction stir welding  /  T6 heat treatment  /  precipitate  /  abnormal grain growth  /  welding joints  /  microstructure of joint
Jia WU, Zhao YANG, Gangxian FAN, Jianqi LU, Yifan LI, Lijia TAN. Effect of Sequence of T6 Heat Treatment and Welding on Microstructure and Mechanical Properties of Friction Stir Welding Joints of A356 Al Alloy[J]. Mining and Metallurgical Engineering, 2023 , 43 (6) : 157 -161 . DOI: 10.3969/j.issn.0253-6099.2023.06.034
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Year 2023 volume 43 Issue 6
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Article Info
doi: 10.3969/j.issn.0253-6099.2023.06.034
  • Receive Date：2023-07-06
  • Online Date：2026-03-05
  • Published：2023-12-01
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  • Received：2023-07-06
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    1.School of Materials Science and Engineering, Central South University, Changsha 410083, Hunan, China
    2.Kunshan Liufeng Machinery Industry Co Ltd, Kunshan 215300, Jiangsu, China
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表12种不同金属材料的力学参数
科
Family		 属数
Number of
genus		 种数
Number of
species		 占总种数比例
Percentage of
total species (%)		 属
Genus		 种数
Number of
species		 占总种数比例
Percentage of total
species (%)
鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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