Extending the Boundaries of Mechanical Properties of Ti-Nb Low-Carbon Steel via Combination of Ultrafast Cooling and Deformation During Austenite-to-Ferrite Transformation

Xiangtao Deng; Tianliang Fu; Zhaodong Wang; Guohuai Liu; Guodong Wang; R. D. K. Misra

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자료유형: 학술저널

저자정보: Xiangtao Deng (Northeastern University) Tianliang Fu (Northeastern University) Zhaodong Wang (Northeastern University) Guohuai Liu (Northeastern University) Guodong Wang (Northeastern University) R. D. K. Misra (University of Texas at El Paso)

저널정보: 대한금속·재료학회 Metals and Materials International Metals and Materials International Vol.23 No.1

발행연도: 2017.1

수록면: 175 - 183 (9page)

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We underscore here a novel approach to extend the boundaries of mechanical properties of Ti-Nb low-carbon steel via combination of ultrafast cooling and deformation during austenite-to-ferrite transformation. The proposed approach yields a refined microstructure and high density nano-sized precipitates, with consequent increase in strength. Steels subjected to ultra-fast cooling during austenite-to-ferrite transformation led to 145 MPa increase in yield strength, while the small deformation after ultra-fast cooling process led to increase in strength of 275 MPa. The ultra-fast cooling refined the ferrite and pearlite constituents and enabled uniform dispersion, while the deformation after ultra-fast cooling promoted precipitation and broke the lamellar pearlite to spherical cementite and long thin strips of FexC. The contribution of nano-sized precipitates to yield strength was estimated to be ~247.9 MPa and ~358.3 MPa for ultrafast cooling and deformation plus ultrafast cooling processes. The nano precipitates carbides were identified to be (Ti, Nb)C and had a NaCl-type crystal structure, and obeyed the Baker-Nutting orientation relationship with the ferrite matrix.

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참고문헌 신청

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