摘要
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CharpyV型缺口试样的冲击韧性分别为50.9和8.7J·cm-2,开CharpyV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Wi/Wt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4.4J,Wi/Wt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 （Wi/Wt） 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 Wi/Wt 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.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2009年第A03期175-180,共6页
Rare Metal Materials and Engineering
基金
国家自然科学基金(50675148)资助
