挤压铸造铝合金铸件内部温度测量及组织特征  

Temperature Measurement and Microstructure Characteristics in Squeeze Casting Aluminum Alloy Parts

作　　者：李彦达[1] 韩志强[1] 黄晓然[1] 万里[2] 柳百成[1,3] 

机构地区：[1]清华大学机械工程系先进成形制造教育部重点实验室 [2]华中科技大学材料成形与模具技术国家重点实验室 [3]清华大学汽车工程系汽车安全与节能国家重点实验室

出　　处：《特种铸造及有色合金》2012年第1期46-49,共4页Special Casting & Nonferrous Alloys

基　　金：国家自然科学基金资助项目(50875143);科技部国际科技合作计划资助项目(2010DFA72760);华中科技大学材料成形与模具技术国家重点实验室开放基金资助项目(09-11)

摘　　要：开发了一种挤压铸造过程直接测量铸件内部温度的方法,该方法能够对直接挤压铸造过程中铸件内部的温度变化进行连续多模次测量。采用该方法,对A356铝合金挤压铸造过程中铸件内部温度变化进行了测量,获得了不同挤压压力下阶梯试件不同部位的冷却曲线。采用光学显微镜对测温部位附近的凝固组织进行了观察,并测量了晶粒尺寸。通过将凝固组织与冷却曲线对照分析,研究了压力对凝固组织的影响。A method for directly measuring the temperature variation in solidification process of squeeze casting has been developed.By using this method,the temperature change during solidification process in squeeze casting A356 aluminum alloy parts was measured,and cooling curves at different locations in a step-shaped parts under different applied pressures were obtained.The microstructure at the locations of temperature measured was observed by using optical microscope,and the grain size was determined.By comparatively analyzing microstructure with cooling curves,the effects of the applied pressure were discribed.

关 键 词：铝合金 挤压铸造 温度测量 凝固组织 

分 类 号：TG292[金属学及工艺—铸造]