반용융 성형된 A357 합금 성형품의 부식 및 기계적 특성에 관한 연구 = Mechanical Behaviors:Corrosion and Mechanical properties of Thixoformed A357 alloy

다국어 초록 (Multilingual Abstract)

The mechanical and corrosion properties of thixoformed A357 alloys were examined with different reheating temperatures, and the results were compared with those of permanent mold cast A357 alloys. It was found that the thixoforming process significantly improved the mechanical properties (i.e., tensile elongation, impact energy and resistance to fatigue crack propagation) and the corrosion resistance of A357 alloys. A 380% increase in tensile elongation and a 120% increase in impact energy were, for example, observed with thixoforming process of A357 alloy in the as-fabricated condition, as compared to the PMC counterparts. The impact energy was extremely sensitive to reheating temperature due to the coarsening of eutectic Si particles. The resistance to fatigue crack propagation for the thixoformed alloy was also much higher than that of permanent mold cast counterpart in the as-fabricated condition. The resistance to both general corrosion and stress corrosion cracking was also greatly improved with thixoforming process. The present observations strongly suggest that the enhancement with thixoforming A357 alloy is largely associated with the size and shape of eutectic Si particles.

목차 (Table of Contents)

• 1. 서론
• 2. 실험 방법
• 3. 실험 결과 및 고찰
• 반용융 성형된 A357 합금의 미세조직, 인장 및 충격 특성
• 반용융 성형된 A357 합금의 피로균열성장 특성
• 반용융 성형된 A357 합금의 양 분극 및 응력부식 특성
• 4. 결론
• 후기