열처리공학회지 (Journal of the Korean Society for Heat Treatment)
- 제14권5호
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- Pages.267-274
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- 2001
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- 1225-1070(pISSN)
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- 2508-4046(eISSN)
Si, Mn, V이 첨가된 비조질강의 미세조직 및 기계적 성질에 미치는 냉각속도의 영향
Effect of Cooling Velocity on the Microstructures and Mechanical Properties of Si, Mn, V added HSLA Steels
- Park, Yon-Seo (Department of Metallurgical Engineering, Kyungpook National University) ;
- Choi, Chang-Soo (Department of Metallurgical Engineering, Kyungpook National University) ;
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Chung, In-Sang
(Department of Metallurgical Engineering, Kyungpook National University)
- 투고 : 2001.06.14
- 발행 : 2001.09.30
초록
Microalloyed steels, which substituted by conventional quenched and tempered steels, have been used in a wide variety of structural and engineering application. The main driving force for preference of MA steels is a cost reduction which can be achieved by an omission of heat treatment. In this study, low carbon martensitic MA steels in 0.18C-0.30(0.60)Si-2.00(1.80)Mn-0.05S-1.5Cr-0.05(0.10)V-0.015Ti(wt%) were investigated to know the effects of cooling method on the mechanical properties and microstructures of Si, Mn, V added microalloyed steel at different reheating temperature. Microstructure of oil quenched steels which were comprised lath martensite, auto-tempered martensite and retained austenite, had more various structure than that of air cooled steel made of mainly bainite. Therefore, oil quenched steels, which had more various microstructure, had better strength-toughness balance compare to air cooled steels. In the impact test, fracture mode of oil quenched steels, which showed good mechanical properties, were dimple, but that of air cooled steels were cleavage.
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