ZL201合金半固态铸造与挤压成形的显微组织  

Microstructure of Semi-solid Casting and Extrusion Forming ZL201 Alloy

作　　者：撒世勇[1] 石天宇[2] 王平[3] 

机构地区：[1]中国人民解放军海军驻鞍山钢铁集团公司军事代表室 [2]沈阳华润三洋压缩机有限公司 [3]东北大学材料电磁过程研究教育部重点实验室

出　　处：《特种铸造及有色合金》2013年第8期729-731,共3页Special Casting & Nonferrous Alloys

基　　金：国家自然科学基金资助项目(51174058)

摘　　要：采用近液相线铸造法制备出ZL201合金半固态锭坯,并对其进行了触变挤压成形。利用金相显微镜观察了其组织变化,并与常规铸造ZL201合金的组织与挤压成形件的组织进行了对比分析。研究结果表明,半固态合金挤压后组织更细小均匀,消除了宏观偏析、晶内疏松等缺陷。主要原因是在挤压过程中晶粒的变形量、畸变区域很大,故在动态再结晶的过程中,半固态合金组织发生再结晶转变的体积分数大于常规铸造合金组织发生再结晶转变的体积分数。The semi-solid ZL201 alloy slurry prepared by near-liquidus casting was thixo-extruded, and microstructure of the thixo-extruded parts was observed and analyzed comparatively with those of con- ventional casting ZL201 alloy parts and squeezing casting parts. The results reveal that microstructure of thixo-extruded parts exhibit fine and uniform with absence of macro-segregation and grain porosities, which are beneficial for improving the mechanical properties of ZL201 alloy parts. During thixo-extruded process, there exist severe grain deformation and distortion zone, leading to recrystallization fraction in semi-solid alloy slurry during dynamic recrystalliztion process higher than that in conventional casting ones, which is responsible for the fine uniform distribution of grain size in thixo-extruded parts

关 键 词：ZL201合金 半固态 近液相线铸造 挤压成形 

分 类 号：TG379[金属学及工艺—金属压力加工] TG292