Semi-Solid Processing by Electric Current During Sand Casting of Aluminium Alloys

5th National Conference on Processing and Characterization of Materials

Prodhan, Anjan^1

MEF Division, National Metallurgical Laboratory, CSIR, Jamshedpur, Jharkhand

831 007, India^1

关键词: Current treatments;    Different geometry;    GrainRefinemnt;    Optical microstructures;    Sand castings;    Semi-solid processing;    Semi-solid state;    Solidification fronts;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/115/1/012005/pdf
DOI  :  10.1088/1757-899X/115/1/012005

来源: IOP

【 摘 要 】

This study reports the effect of DC and 50Hz AC treatment (ECT) on aluminium or aluminium alloys during solidification in sand moulds i.e., at their semisolid state. Castings, with different geometry, were made in open or closed sand moulds. It is observed that ECT (a) reduces dissolved gas, (b) reduces internal shrinkage and (c) metal mould reactions in castings. It is also observed that the AC treatment is more effective compared to DC treatment. ECT changes the movement of solidification front. The optical microstructures of ECT samples are quite similar to the samples treated in other semisolid processing methods.