Influence of rolling speed on microstructure and mechanical properties of AZ31 Mg alloy rolled by large strain hot rolling
Influence of rolling speed on microstructure and mechanical properties of AZ31 Mg alloy rolled by large strain hot rolling
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DOI：
10.1016/j.msea.2014.04.024
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发表时间：
2014-06
期刊：
影响因子：
6.4
通讯作者：
F. Guo;Dingfei Zhang;Xusheng Yang;Luyao Jiang;Chai Sensen;F. Pan
中科院分区：
文献类型：
--
作者：
F. Guo;Dingfei Zhang;Xusheng Yang;Luyao Jiang;Chai Sensen;F. Pan
研究了轧制速度对AZ 31镁合金板材组织和力学性能的影响。试样热轧近55%的厚度减少在一个单一的轧制道次在3.5和12.1米/分钟之间变化的轧制速度。结果表明，孪晶占主导地位的变形在较低的轧制速度和动态再结晶收缩的剪切带。而在高速轧制条件下，动态再结晶行为得到明显扩展，组织变得均匀。轧制过程中形成的再结晶晶粒影响着轧制板材的屈服行为。随着轧制速度的提高，动态再结晶的增强，拉伸塑性逐渐提高。动态再结晶是消耗变形能的有效途径，可以抑制边裂的萌生。
The influence of the rolling speed on microstructure and mechanical properties of as-rolled AZ31 Mg alloys sheet was critically examined. Samples were hot rolled by nearly 55% thickness reduction in a single rolling pass at rolling speeds varying between 3.5 and 12.1 m/min. The results showed that twinning dominated the deformation at lower rolling speed and dynamic recrystallization was constricted in shear bands. While, at high rolling speed, dynamic recrystallization behavior was largely extended and microstructure became homogeneous. The yield behavior of as-rolled sheets was affected by the recrystallized grains formed during rolling. The tensile ductility was gradually improved as rolling speed increased, due to the enhancement of dynamic recrystallization. The dynamic recrystallization is an effective way to consume the deformation energy, which may suppress edge crack initiation.