Microstructure Evolution, Fracture and Hardening Mechanisms of Quenched and Tempered Steel for Large Sized Bearing Rings at Elevated Quenching Temperatures

Bo Jiang; Zhen Mei; Leyu Zhou; Chaolei Zhang; Yazheng Liu

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자료유형: 학술저널

저자정보: Bo Jiang (University of Science and Technology Beijing) Zhen Mei (University of Science and Technology Beijing) Leyu Zhou (University of Science and Technology Beijing) Chaolei Zhang (University of Science and Technology Beijing) Yazheng Liu (University of Science and Technology Beijing)

저널정보: 대한금속·재료학회 Metals and Materials International Metals and Materials International Vol.22 No.4

발행연도: 2016.1

수록면: 572 - 578 (7page)

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Based on 42CrMo steel, a steel with a higher C and Ni content is developed for use in large sized bearing rings. The impact energy and hardness of the quenched and tempered steel increase with the quenching temperature, but then decrease when the temperature is above 925 °C. When the temperature is below 925 °C, some larger M23C6-type carbides (with average diameters of 255.6 μm) exist in the quenched and tempered microstructure. The number of carbides is reduced as the quenching temperature increases. At the same time, the fracture modes change from microvoid coalescence and quasi-cleavage to microvoid coalescence. The number of round quasi-cleavage fractures, which are formed around the carbides, decrease as the number of carbides decrease. The existence of larger M23C6-type carbides leads to round quasi-cleavage fractures and decrease the impact energy. The precipitation strengthening of M23C6-type carbides increases the hardness at a quenching temperature of 925 °C.

참고문헌 (26)

참고문헌 신청

B. Jiang / 2014 / Acta Metall. Sin. (Engl. Lett. ) 27:383

H. K. D. H. Bhadeshia / 2006 / Steels:Microstructure and Properties: Microstructure and Properties / Elsevier :183~190

B. C. De Cooman / 2012 / Fundamentals of Steel Product Physical Metallurgy / Warrendale :183~184

S. K. Dhua / 2001 / Mater. Sci. Eng. A 318:197

B. Z. Lou / 1979 / Acta Metall. Sin 15:498

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