Effect of heat treatment on microstructures and mechanical properties of Al/Fe bimetal

Abstract

The Al/Fe bimetallic castings were prepared by the compound casting combined with hot-dip galvanising and aluminising, and the effect of the heat treatment on microstructures and mechanical properties of the Al/Fe bimetallic castings was systematically studied in the present work. The thickness of the reaction layer of the Al/Fe bimetallic castings continuously increased with increasing solution temperature or prolonging solution time. However, the excessive solution temperature and solution time promoted cracks of the reaction layer. Regardless of as-cast or heat treatment, there were respectively the Fe2Al5, Al9Fe4Si3, FeAl3, Al8Fe2Si and Al4.5FeSi phases in the reaction layers. The nano-hardnesses of the reaction layer after heat treatment exhibited an increase compared to that of the as-cast condition.

Effects of Sr Additions on the Interfacial Reaction Layers Formed between Liquid Al-Si-Cu Alloy and Cast Iron

“…While there are multiple methods available for compounding different metallic materials, compound casting has gained significant attention due to its remarkable economic efficiency and practicality. [1][2][3][4] When performing compound casting of cast iron and aluminum alloy, a common approach involves utilizing cast iron as an insert and pouring molten aluminum onto it. Consequently, the surface of the cast iron insert that comes into contact with the molten aluminum dissolves into the aluminum.…”

Effects of Cu and Zr Addition on the Tensile Properties, Corrosion Characteristics and Interfacial Compounds with Cast Iron of Al-Si-Mg Alloy for Compound Casting

“…특히, 내식성에 대한 영향은 잘 알려져 있 지 않는데, Zr이 Er과 같이 Al-Si합금에 첨가된 경우에는 내식성을 저해하는 경향을 보이나 Sc과 함께 Al-Mg합금 에 첨가되면 내식성을 개선한다고 보고된바 있다. 4,5) 한편, 철계 합금과 알루미늄합금을 복합화하는 방법으 로는 제조가 상대적으로 간단하고 경제성이 높은 복합주 조가 관심을 받고 있으며, [6][7][8] 대표적인 예로는 주철인서트 를 주형에 장착한 후 알루미늄합금 용탕을 주입하여 하이 브리드 부품을 제조하는 방식이다. 9) 철계 합금과 알루미 늄합금의 복합주조 계면에는 다양한 화합물들이 형성되 며, [9][10][11]…”