Electronic Theses and Dissertation

Hot-tearing susceptibility (HTS) adalah masalah kritis dalam pengecoran logam, khususnya pada paduan aluminium, disebabkan oleh tegangan dan regangan terfokus selama penyusutan volumetrik dan pemadatan. Penelitian ini mempelajari mekanisme HTS pada paduan aluminium seri 6061 menggunakan dua metode pemadatan: konvensional dan Controlled Diffusion Solidification (CDS). CDS, yang melibatkan pencampuran dua paduan dasar pada suhu likuidus, terbukti mengurangi risiko robekan panas. Faktor seperti suhu penuangan, desain cetakan, komposisi kimia, dan kecepatan penuangan juga dipertimbangkan. Hasil menunjukkan CDS efektif mengurangi HTS dengan mempertimbangkan kondisi pemadatan titik eutektik, memberikan kontribusi penting dalam menghasilkan produk cor berkualitas tinggi dan bebas cacat pada paduan aluminium 6061.

Hot-tearing susceptibility (HTS) is a critical problem in metal casting, especially in aluminum alloys, caused by focused stresses and strains during volumetric shrinkage and solidification. This study investigates the mechanism of HTS in 6061 series aluminum alloys using two solidification methods: conventional and Controlled Diffusion Solidification (CDS). CDS, which involves mixing two base alloys at the liquidus temperature, has been shown to reduce the risk of hot tearing. Factors such as pouring temperature, mold design, chemical composition, and pouring speed are also considered. The results show that CDS is effective in reducing HTS by considering the eutectic point solidification condition, making an important contribution to producing high-quality and defect-free castings in 6061 aluminum alloys.