| 摘要: |
| 采用脉冲钨极氩弧焊工艺对6mm的6061-T6(固溶处理+人工时效)铝合金板进行对接试验,基于微观组织分析、力学性能试验和断口分析,探究焊接状态与固溶时效状态下的接头各区域组织和性能。结果表明,焊后焊态下的接头热影响区强度显著降低,显微硬度最低为48HV；焊后对接头进行固溶时效处理能强化焊接接头,热影响区显微硬度几乎都到了80HV以上；拉伸断口形貌均为韧性断裂模式,固溶时效的韧窝较焊态下浅且细小,塑性变差。固溶时效处理改善了热影响区强化相组织形态,平横相β-Mg2Si转变成与基体保持共格或半共格的β〞相或β´相,该软化区域机械性能得以恢复。 |
| 关键词: 6061铝合金 热影响区 固溶时效处理 微观组织 |
| DOI： |
| 分类号:TG444 |
| 基金项目: |
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| Effects of Solution Treatment and Aging on Microstructures and MechanicalProperties of Aluminum Alloy 6061 Welded Joints |
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Lu Yi
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CSIC Haisheng Technology Co.,Ltd
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| Abstract: |
| A butt joint test was conducted on a 6mm 6061-T6 aluminum alloy plate using pulsed tungsten inert gas arc welding technology. Based on microstructure analysis, mechanical performance testing, and fracture analysis, the microstructure and properties of the joint in various regions under welding and solution aged conditions were explored. The results show that the strength of the heat affected zone of the joint in the welded state is significantly reduced, and the minimum micro-hardness is 48HV; After welding, solid solution aging treatment can strengthen the welded joint, and the micro-hardness of the heat affected zone is almost always above 80HV.The tensile fracture morphology is characterized by ductile fracture mode. The toughness dimples of solid solution aging are shallower and smaller than those in the welded state. Solid solution aging treatment improves the microstructure of the strengthening phase in the heat affected zone. Transition from equilibrium phase β to strengthening phase β〞or β´.The mechanical properties of the softened area have been restored. |
| Key words: 6061 aluminum alloy Heat affected zone Solid solution aging treatment Microstructure |
