研究了AZ31镁合金及其TIG焊接接头常温时的示波冲击性能.研究表明,AZ31镁合金板材未开缺口和开Charpy V型缺口试样的冲击韧性分别为50.9和8.7 J·cm~(-2),开Charpy V型缺口试样的冲击韧性大幅降低.裂纹形成能量与冲击吸收能量的比值W_i/W_t分别为62.0%和53.8%,说明试样断裂过程中,冲击吸收能量主要用于裂纹的形成.对于TIG焊接接头,在焊缝中心和热影响区开缺口试样的冲击吸收能量Wt分别为4.9,3.9,4.5和4.4 J,W_i/W_t分别为16.3%,15.4%,15.6%和15.9%,说明在同样缺口情况下,焊接接头比母材更容易形成裂纹.从微观组织和断口形貌上解释了这一原因.
The oscillography impact property of magnesium alloy and its TIG welded joints was studied at room temperature. The impact toughness of the base metal specimens without notch is 50.9 J·cm~(-2), which is much greater than that of the specimens with a notch, only 8.7 J·cm~(-2). The ratios of the crack forming energy to impacting absorption energy (W_i/W_t) are 62.0% and 53.8% respectively, which indicates that quite a large portion of the impacting absorption energy is served for the crack propagation. The impacting absorption energy of the welded specimens are 4.9,3.9,4.5 and 4.4 J respectively, and the W_i/W_t are 16.3%,15.4%,15.6% and 15.9% respectively, which indicates that the welded joints are more easy to form cracks under the same condition. The microstructure was studied to explain the results.
参考文献
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