A357铝合金过渡环铸件粘砂行为研究  

Sand Penetration Behavior of A357 Aluminum Alloy Transition Ring Castings

作　　者：樊振中[1] 熊艳才[1] 姚惟斌[1] 张喆[1] 

机构地区：[1]北京航空材料研究院

出　　处：《特种铸造及有色合金》2012年第8期694-698,共5页Special Casting & Nonferrous Alloys

摘　　要：研究了高强铸造铝合金A357过渡环铸件在浇注充型过程中的粘砂行为。通过金相组织观察、硬度测试、SEM和EDS扫描与力学性能测试,对铸件粘砂缺陷严重区域进行了分析测试。结果表明,A357铝合金过渡环铸件粘砂缺陷严重区域并未发生界面化学反应,X光检测下其内部型腔处的缺陷主要为高温铝合金熔液强烈冲刷树脂砂铸型表面涂料后,以毛细管渗透与气相渗透方式而形成的机械粘砂。通过在涂料中添加耐高温氧化物和增加涂料的涂刷厚度,减少了铸件内部型腔处机械粘砂,提高了A357铝合金过渡环铸件的整体力学性能。The adhering sand behavior of high strength A357 aluminum alloy transition ring castings dur- ing the pouring and solidification process was analyzed. Through the metallographic microstructure ob- servation, micro-hardness measurements, SEM （scanning electron microscope） and EDS （energy disper- sive spectrometer） and mechanical properties testing, serious adhering sand defects area were analyzed and identified. The results show that interface chemical reaction nearby the sand burning area can not be observed, and the internal casting defects in the cavity belong to mechanical adhering sand by the X-ray diffraction, which is attributed to the capillary permeability and gas phase penetration effect as a result of high temperature melting aluminum strongly eroding the surface coating of resin sand mould. With adding resistant high temperature oxide into the coating and increasing the coating^s thickness, the se- verity of mechanical adhering sand among the interface area is relieved, improving greatly the mechanical properties of the A357 aluminum alloy transition ring castings.

关 键 词：A357铝合金 粘砂缺陷 过渡环铸件 树脂砂 

分 类 号：TG292[金属学及工艺—铸造]