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- Title
High strength and low yield ratio carbon steel bar processed by thermomechanical rolling.
- Authors
Qiu, H.; Kawaguchi, Y.; Shiga, C.; Enoki, M.; Kishi, T.
- Abstract
Adding alloying elements or refining grain size are the common means to increase the strength of steels. By refining ferrite grains down to 1μm through thermomechanical rolling, a high strength and low yield ratio (the ratio of yield strength to tensile strength) steel bar with good impact toughness has been developed from an ingot with a similar chemical composition to that of mild steel. The steel bar consisted of large ferrite grains (1 – 15μm), small ferrite colonies (smaller than 1μm), and martensite. The tensile strength, 0.2% offset yield strength, yield ratio, uniform tensile elongation, and elongation up to fracture of the developed steel were: 856 MPa, 478 MPa, 0.558, 11.6%, and 19.1%, respectively. The absorbed energy in Charpy impact test at -40°C was 134 J. The toughness and strength of the steel can be adjusted by varying the volume fractions of the large ferrite grains, small ferrite colonies, and martensite.
- Subjects
STEEL; STRENGTH of materials; METALS; THERMOMECHANICAL treatment; HEAT treatment of metals; FERRITES
- Publication
Materials Science & Technology, 2004, Vol 20, Issue 9, p1158
- ISSN
0267-0836
- Publication type
Article
- DOI
10.1179/026708302225005864