摘要
目的得到综合力学性能良好的AZ31镁合金Φ8 mm薄壁管材。方法研究了热挤压、等温挤压与反向温度场挤压3种工艺对AZ31镁合金薄壁管材晶粒组织和力学性能的影响。结果热挤压管材组织不均匀,头部晶粒粗大、尾部细小,等温挤压和反向温度场管材挤压组织较为均匀。结论反向温度场挤压在模具温度为300℃、坯料温度为20℃条件下,薄壁管材抗拉强度达278MPa,伸长率达20.1%,综合力学性能最佳。
ABSTRACT:In order to obtain AZ31 alloy thin tubes ofΦ8 mm with good mechanical properties,that focused on the effect of grain microstructure and mechanical properties of the as-extruded thin tubes of AZ31 magnesium alloy by hot extrusion,and un-thermal extrusion. Studies have found that microstructure of hot extrusion is uneven,head grains were coarse,the tail grains were relatively small,and the others were well-proportioned. With comparison of The Three mechanical performance,it got the best tube tensile strength of about 278 MPa,elongation of about 20.1%,when un-thermal extrusion is in the mold temperature of 300℃,billet temperature is 20℃.
出处
《精密成形工程》
2016年第3期34-39,共6页
Journal of Netshape Forming Engineering
关键词
热挤压
等温挤压
反向温度场挤压
晶粒组织
力学性能
hot extrusion
isothermal extrusion
un-thermal extrusion
grain microstructure
mechanical performance
