线能量的变化对镁合金AZ61焊接接头微观组织和机械性能的影响
首发时间:2009-09-25
摘要:本文通过微观组织观察、显微硬度测试和拉伸实验系统研究了线能量的变化对热挤压镁合金AZ61钨极氩弧焊焊接接头微观组织和机械性能的影响。结果表明:随着线能量的增加,熔合区(HAZ)和热影响区(HAZ)的晶粒均出现粗化,热影响区宽度增加。而且,线能量的增加导致热影响区和熔合区中连续状β-Mg17Al12相减少,颗粒状β-Mg17Al12相增多。适当的增加线能量可以提高焊接接头的极限抗拉强度,但过高的线能量会导致焊接接头的极限抗拉强度下降。此外,焊接接头热影响区和熔合区的平均显微硬度值随着焊接线能量的增加先急剧下降,后趋于平缓。
关键词: 镁合金AZ61 钨极氩弧焊 微观组织 力学性能 线能量
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Effect of heat input on the microstructure and mechanical properties of tungsten inert gas arc butt-welded AZ61 magnesium alloy plates
Abstract:In this paper, the effects of heat input on the microstructures and mechanical properties of tungsten inert gas arc butt-welded AZ61 magnesium alloy plates were investigated by microstructural observations, microhardness tests and tensile tests. The results show that with an increase of the heat input, the grains both in the fusion zone and the heat-affected zone coarsen and the width of the heat-affected zone increased. Moreover, an increase of the heat input resulted in a decrease of the continuous β-Mg17Al12 phase and an increase of the granular β-Mg17Al12 phase in both the fusion zone and the heat-affected zone. The ultimate tensile strength of the welded joint increased with an increase of the heat input, while, too high a heat input resulted in a decrease of the ultimate tensile strength of the welded joint. In addition, the average microhardness of the heat-affected zone and fusion zone decreased sharply with an increase of the heat input and then decreased slowly at a relatively high heat input.
Keywords: AZ61 magnesium alloy tungsten inert gas arc welding microstructure mechanical properties heat input
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线能量的变化对镁合金AZ61焊接接头微观组织和机械性能的影响
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