孙甲尧,刘让贤,胡良君,袁江,陈胜迁.焊后时效对异种铝合金搅拌摩擦焊接头的影响[J].有色金属工程,2018,8(3):.
焊后时效对异种铝合金搅拌摩擦焊接头的影响
Effect of artificial aging process after welding on friction stir welding joints of dissimilar aluminum alloys
投稿时间:2017-03-29  修订日期:2017-04-21
DOI:
中文关键词:  人工时效  A356-T6/6061-T6  异种铝合金  搅拌摩擦焊  
英文关键词:Artificial aging  A356-T6/6061-T6  dissimilar aluminum alloys  FSW
基金项目:湖南省高等学校科学研究项目(15C1404)
              
作者单位
孙甲尧 中南大学机电工程学院
刘让贤 张家界航空工业职业技术学院
胡良君 张家界航空工业职业技术学院
袁江 张家界航空工业职业技术学院
陈胜迁 中南大学机电工程学院
摘要点击次数: 132
全文下载次数: 0
中文摘要:
      采用OM、SEM、万能力学试验机、显微硬度仪等手段研究了焊后时效工艺对A356-T6/6061-T6异种铝合金搅拌摩擦焊接头的影响,并讨论其影响机制。研究结果表明:人工时效有利于提高接头的抗拉强度和屈服强度,但延伸率有所下降。当时效温度为165℃、时效时间为5h时,接头抗拉强度和屈服强度分别达到285、240MPa,约为A356-T6的96.6%和90%,较未人工时效接头强度提高35.7%和60%,延伸率下降40%。焊后人工时效对整个接头的硬度都有一定的提高作用,焊缝各区提高幅度不一致,改变了焊缝区的硬度分布格局,导致低硬度区和断口位置由返回侧热影响区向前进侧转移。人工时效能有效降低第二相的面积分数和颗粒尺寸,提高第二相的圆整度。但保温温度过高和时间过长,均可能导致第二相面积分数的提高和粗化。
英文摘要:
      The effects of artificial aging process on A356-T6 / 6061-T6 FSW joints were investigated by OM, SEM, universal mechanical testing and microhardness testing. And then its influence mechanism was discussed. The results showed that the tensile strength and yield strength of the joints were improved significantly after artificial aging,and the elongation was decreased. When the aging process is 165℃/5h,the tensile and yield strength of the joints were reach to 285MPa and 240 MPa,about 96.6% and 90% of A356-T6 base material, respectively. The tensile and yield strength of the joints were improved 35.7% and 60% compared to pre-aging, respectively,but the elongation was decreased by 40%. Morever,the hardness of the weld zone was improved after artificial aging. And the hardness distribution was changed due to difference of increasing amplitude,which resulted the low hardness region and fracture location transferred from the heat-affected zone on the returning side to the advancing side. At last,the area fraction and particle size of the second phase were reduced effectively,and the roundness was improved after artificial aging.The area fraction increasing and size coarsening of second phase were occurred when the aging temperature is too high or the aging time is too long.
查看全文  查看/发表评论  下载PDF阅读器
关闭