pISSN : 1598-706X / eISSN : 2288-8381
한국주조공학회지 (38권2호 32-40)
Changes of Microstructures and Mechanical Properties of Recycled AC2B Alloy Chip Fabricated by Solution Heat Treatment
재활용 절삭칩으로 제조된 AC2B 합금의 용체화 열처리에 따른 미세조직 및 기계적특성 변화
Dong-Hyuk Kim, Jong-Cheon Yoon, Chang-Young Choi, Si-Geun Choi, Myoung-Pyo Hong, Sang-Yoon Shin* and Byung-Joon Ye*†
Korea Institute of Industrial Technology,*Depatment of Metallurgical Engineering Graduate School of Kyungpook National University
Changes in the microstructures and mechanical properties of an AC2B alloy through solution heat treatment were investigated using recycled AC2B cutting chips as raw material. The as-cast microstructure of the AC2B alloy comprised α-Al, Al2Cu, and coarse needle-shaped phases considered to be eutectic Si and an Al-Fe-Si based i intermetallic compound. After solution heat treatments at 505oC for 1 h and 6 h, the s samples showed complete dissolution of Al2Cu and relatively fine distribution of intermetallic compounds. Hardness test results showed that the hardness rapidly increased after the solution heat treatment for 1 h by solid solution hardening, and the increase of hardness exhibited a plateau from 1 h to 6 h. The results of the hardness and tensile tests showed that there was no visible difference in the effect of 1 h and 6 h solid solution treatment.
Al-Si-Cu system, AC2B, Cutting chip, Recycling, Solution heat treatment
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