摘要
在300℃每道次压下量为0.4 mm的实验条件下,对不同尺寸的AZ31镁合金板材进行轧制实验,通过对轧后板材心部和边部区域的金相组织观察、硬度测试,研究了轧后板材心部和边部的组织性能变化规律及板材尺寸对试样组织性能的影响。结果表明:在相同的实验条件下,随轧制道次和累积变形量的增加,轧后板材心部和边部硬度,整体呈交替上升趋势。样品尺寸对AZ31轧制板材组织性能有一定的影响;随试样长宽比例的减小,在相同的压下量下,轧后板材的边部硬度有所降低,中间动态再结晶完成的程度较高。AZ31镁合金板材出现边裂时,随试样长宽比例的减小,边部硬度呈下降趋势。
AZ31 magnesium sheets with different sizes were rolled at 300℃ and per pass reduction is 0. 4mm. Microstructure test and hardness test were used to investigate the microstructures and properties evolution rule of middle and edge area. And the effects of sheets sizes on microstructures and properties of sheets were also studied. The results show that,under the same experimental conditions,as the rolling passes and accumulated deformation increase,the hardness of middle and edge appear alternated rising on the whole. With the length-width ratio decreasing,the hardness at the edge of the rolled sheet becomes lower in the per pass reduction under the same conditions,and more recrystallized grains are generated at the middle of the rolled sheets. When the edge cracks occuring,the hardness of edges are showing a downward trend,as the length-width ratio decreases.
出处
《材料开发与应用》
CAS
2014年第4期53-58,共6页
Development and Application of Materials
关键词
AZ31镁合金
轧制
硬度
显微组织
AZ31 magnesium alloy
rolling
hardness
microstrueture
