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ZK40高強鎂合金CO2激光焊接接頭的組織與力學(xué)性能
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更新時間：2015-11-06
采用CO2激光對軋制態(tài)ZK40鎂合金板材進行焊接，并研究焊接工藝參數(shù)對接頭顯微組織及力學(xué)性能的影響規(guī)律。
ZK40高強鎂合金CO2激光焊接接頭的組織與力學(xué)性能Microstructures and mechanical properties of ZK40 high strength magnesium alloy joints by CO2?laser beam welding
采用CO2激光對軋制態(tài)ZK40鎂合金板材進行焊接，并研究焊接工藝參數(shù)對接頭顯微組織及力學(xué)性能的影響規(guī)律。結(jié)果表明：在合理的工藝條件下，可以獲得成型良好的焊接接頭，其抗拉強度可達(dá)到315MPa，為母材的91.3%；熔池邊界無外延生長的柱狀晶，整個熔池完全由細(xì)小均勻的等軸樹枝晶組成；分布于晶界及枝晶臂間的第二相粒子主要是Mg51Zn20；隨著焊接熱輸入的增大，枝晶臂生長更為發(fā)達(dá)，晶粒粗化。
The as-rolled ZK40 magnesium alloy sheets were joined by laser beam welding. The effects of welding parameters on the microstructures and mechanical properties of the joints were studied. The results show that a sound bead, with the ultimate tensile strength of 315 MPa, up to 91.3% of that of base metal, can be obtained with the optimized welding parameters. No columnar grains can be found at the fusion boundary, and the fusion zone (FZ) is characteristic of equiaxed dendritic grains and fine Mg51Zn20?precipitates disperse along the grain boundaries and among the dendritic arms. With the heat input increasing, the grains in FZ get coarser and more dendritic.
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