Effect of direct quenching on microstructure and mechanical properties of copper-bearing high-strength alloy steels
SCIE
SCOPUS
- Title
- Effect of direct quenching on microstructure and mechanical properties of copper-bearing high-strength alloy steels
- Authors
- Hwang, GC; Lee, S; Yoo, JY; Choo, WY
- Date Issued
- 1998-09-15
- Publisher
- ELSEVIER SCIENCE SA
- Abstract
- This study aims to investigate the effects of direct quenching on microstructural modification and mechanical properties of copper-bearing high-strength alloy steels. Two direct quenched and tempered (DQ&T) steel plates were rolled at different finish rolling temperatures, and their microstructures and mechanical properties were compared with those of a reheat quenched and tempered (RQ&T) steel plate. The as-quenched microstructure of the DQ plates consisted of refined lath martensite with high density of dislocations, which acted as preferred precipitation sites for NbC or epsilon-Cu particles during tempering. These fine precipitates were not coarsened much up to the tempering temperature of about 650 degrees C, and thus played a role in improving the tempering resistance. Especially in the DQ&T plate quenched at 760 degrees C and tempered at 660 degrees C, yield strength reached 1050 MPa, and Charpy impact energy at - 18 degrees C showed 140 J, indicating the potent effect of the DQ&T process. These findings indicated that the copper addition and the application of the DQ&T process to low-carbon alloy steels contributed to the production of steel plates with excellent strength and toughness. (C) 1998 Elsevier Science S.A. All rights reserved.
- Keywords
- direct quenching; reheat quenching; microstructure
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/20669
- DOI
- 10.1016/S0921-5093(98)00670-4
- ISSN
- 0921-5093
- Article Type
- Article
- Citation
- MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, vol. 252, no. 2, page. 256 - 268, 1998-09-15
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