电子束焊接热效应对镁合金焊缝显微硬度的影响

发布时间：2018-04-29 00:16

本文选题：真空电子束焊接 + 热效应　；参考：《稀有金属材料与工程》2017年02期

【摘要】：研究了真空电子束焊接热效应对AZ91D和AZ31B镁合金焊缝显微硬度的影响机制,实验结果表明,真空电子束焊接热效应对AZ91D、AZ31B镁合金焊缝均有不同程度的强化作用。当焊接热输入较大时,影响AZ91D镁合金焊缝硬度的主要因素为因Mg元素烧损而产生的强化相变化,焊接热输入越大,焊缝中的Mg元素烧损增加,使Al元素含量(质量分数,下同)逐渐增加,从而在焊缝中生成了更多的强化β相,使焊缝硬度得到提高,产生的强化相越多,焊缝硬度相对越大;当焊接热输入较小时,影响AZ31B镁合金焊缝硬度的主要因素为焊后冷却速度,焊接热输入越小,焊后冷却速度越快,焊缝晶粒越细小,焊缝硬度相对越大。
[Abstract]:The effect of vacuum electron beam welding heat effect on the microhardness of AZ91D and AZ31B magnesium alloy welds is studied. The experimental results show that the vacuum electron beam welding heat effect can strengthen the weld of AZ91 DX AZ31B magnesium alloy to varying degrees. When the welding heat input is large, the main factor affecting the weld hardness of AZ91D magnesium alloy is the change of strengthening phase caused by the burning loss of mg element. The larger the welding heat input, the higher the burning loss of mg element in the weld, which makes the content of Al element (mass fraction) increase. The hardness of the weld is increased, and the hardness of the weld is relatively greater when the welding heat input is small, and the hardness of the weld increases gradually, so that the hardness of the weld increases with the increase of the hardness of the weld, and the hardness of the weld increases with the increase of the hardness of the weld, when the heat input is small, The main factor affecting the weld hardness of AZ31B magnesium alloy is the cooling rate after welding. The smaller the input of welding heat, the faster the cooling rate after welding, the smaller the grain size of weld, and the greater the hardness of weld.
【作者单位】：重庆理工大学;重庆市特种焊接材料与技术高校工程研究中心;
【基金】：重庆市教委科学技术研究项目(KJ1400930) 重庆市高校青年骨干教师资助计划
【分类号】：TG456.3

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