锻压技术

加热温度对AZ31镁合金连续挤压组织与性能的影响

英文标题：Effect of heating temperature on microstructure and properties of AZ31 magnesium alloy in CONFORM process

作者：杨俊英高飞宁海石宋宝韫

分类号：TG379

出版年,卷(期):页码：2014,39(5):106-110

摘要：

采用连续挤压方法，开展AZ31镁合金工艺试验，研究加热温度对挤出产品微观组织和力学性能的影响。结果表明，加热温度对AZ31镁合金组织影响明显，坯料室温挤压时，产品的芯部组织均匀细小，而表层的晶粒大小不均。随着加热温度的升高，微观组织的均匀程度提高。当坯料加热到450 ℃时，挤出产品芯部的晶粒有长大的趋势。连续挤压后的晶粒相比坯料显著细化，这是由于坯料在连续挤压过程中经历了多种变形，使晶粒得到细化。随着加热温度的升高，抗拉强度增加，伸长率变化不大，这是由于温度的适当提高，使再结晶充分，晶粒均匀程度提高。

The process experiment of AZ31 magnesium alloy was carried out using the continuous extrusion forming process (CONFORM). The effect of heating temperature on the microstructure and mechanical properties was investigated. The results show that the effect of heating temperature on the microstructure of AZ31 magnesium alloy is obvious. Grains are uniform and fine in the core region and grain size is inhomogeneous in the surface region when the extrusion of billet is done at room temperature. With the increase of heating temperature, the uniformity of microstructure increases. The grains in the core region have grown up when the billet heating temperature is 450 ℃. The grain refinement is obviously realized comparing to billet after CONFORM process. The reason is that the billet suffers multiple deformations during CONFORM process which leads to the grain refinement. The tensile strength increases and the elongation does not change significantly with heating temperature increasing. This is due to that the proper improvement of temperature induces sufficient recrystallization and improves the grain uniformity.

基金项目：

辽宁省自然科学基金资助项目（2013020135）；辽宁省教育厅项目（L2013186）

杨俊英（1981-），女，博士，副教授

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