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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 grit-sticking behavior of high strength cast aluminum alloy A357 transitional ring castings during casting and filling was studied. Through the microstructure observation, hardness test, SEM and EDS scanning and mechanical properties test, the serious area of the sticky sand defect was analyzed and tested. The results showed that there was no interfacial chemical reaction in the serious area of sticking sand defects of A357 aluminum alloy transitional castings. The defects in the inner cavity of the transitional ring castings of A357 aluminum alloy were mainly caused by the high temperature molten aluminum alloy scouring the surface of resin sand mold Capillary penetration and gas penetration and the formation of mechanical sticky sand. By adding high temperature oxide in the coating and increasing the brushing thickness of the coating, the mechanical sticking sand in the cavity of the casting is reduced, and the overall mechanical properties of the transition casting of the A357 aluminum alloy are improved.