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焊后熱處理對鎂合金攪拌摩擦焊接接頭的影響
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國家自然科學基金（50774059）；西安建筑科技大學材料加工工程重點學科資助項目（E04001）


Influences of Post-weld Heat Treatments on Friction Stir-welded AZ31B Magnesium Alloy Joints
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    摘要:

    對AZ31B鎂合金進行攪拌摩擦焊接，研究熱處理前后焊接接頭組織及性能的變化。結果表明：焊后熱處理可以顯著改善焊接接頭的力學性能；當攪拌頭的旋轉速度為600 r·min-1，焊接速度為47.5 mm·min-1，接頭的抗拉強度為168 MPa，延伸率為3.6%。熱處理后，接頭的抗拉強度和延伸率最高可達205 MPa和8.6%，比熱處理前分別提高22.02%和138.89%；接頭的最佳熱處理工藝為：退火溫度250 ℃，保溫1 h；隨著退火溫度的升高，焊核區(qū)晶粒的長大速度大于熱影響區(qū)/熱機影響區(qū)混合區(qū)域（HAZ/TMAZ）。當退火溫度高于250 ℃時，焊接接頭的拉伸斷口主要為扁條狀韌窩，呈現(xiàn)出微孔聚合韌性斷裂特征。

    Abstract:

    Friction stir welding was conducted on AZ31B magnesium alloy. Variation of microstructures and properties of the welding joints before and after heat treatments was studied. The results show that post-weld heat treatments can markedly improve the mechanical properties of the friction stir-welded AZ31B magnesium alloy joints; when the rotating speed of stirring pin is 600 r·min-1 and the welding speed is 47.5 mm·min-1, the ultimate tensile strength can reach 168 MPa and the elongation is 3.6%. After heat treatments, the highest ultimate tensile strength can reach 205 MPa, which is 22.02% higher than that before heat treatments and the elongation is 8.6%, which is 138.89% higher than before heat treatments. The ideal heat treatment technique of the joint is keeping the annealing temperature at 250 oC for 1 h. As the annealing temperature increases, the growing speed of welding nugget zone grain is higher than the heat affected zone/thermo-mechanically affected zone. When the annealing temperature is higher than 250 oC, the morphologies of tensile fracture of welding joints mainly exhibit oblate dimples with a typical ductile dimple-fracture.

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郭 韡,王快社,王 文,王 峰,王文禮.焊后熱處理對鎂合金攪拌摩擦焊接接頭的影響[J].稀有金屬材料與工程,2011,40(6):1075~1078.[Guo Wei, Wang Kuaishe, Wang Wen, Wang Feng, Wang Wenli. Influences of Post-weld Heat Treatments on Friction Stir-welded AZ31B Magnesium Alloy Joints[J]. Rare Metal Materials and Engineering,2011,40(6):1075~1078.]
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  • 收稿日期:2010-06-30
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