Effect of Vanadium on the Microstructure and Mechanical Properties of 2100 MPa Ultra-High Strength High Plasticity Spring Steel Processed by a Novel Online Rapid-Induction Heat Treatment

Qi‑Lei Dai; Kun Li; Kai‑Ren Meng; Zhou Fang; Wen Chen; Tian‑Bao Yang; Chi Feng; Jin‑Ming Wu; R. D. K. Misra

doi:10.1007/s12540-022-01273-x

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자료유형: 학술저널

저자정보: Qi‑Lei Dai (Zhejiang University) Kun Li (Chongqing University) Kai‑Ren Meng (Hwaway Technology Co. Ltd) Zhou Fang (Hwaway Technology Co. Ltd) Wen Chen (Chongqing University) Tian‑Bao Yang (Chongqing University) Chi Feng (Chongqing University) Jin‑Ming Wu (Zhejiang University) R. D. K. Misra (University of Texas at El Paso)

저널정보: 대한금속·재료학회 Metals and Materials International Metals and Materials International Vol.29 No.4

발행연도: 2023.4

수록면: 922 - 933 (12page)

DOI: 10.1007/s12540-022-01273-x

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Advanced automotive industries generate large demand for the next generation of high strength and high toughness springsteels. Vanadium-containing 55SiCrV spring steels subjected to rapid-induction heating treatment can fulfil such requirements.However, the effect of vanadium microalloying under online rapid-induction heat treatments is rarely reported. Acomparative study of the microstructure and tensile properties of 55SiCr and 55SiCrV spring steel wires subjected to a novelonline rapid induction heat treatment has been demonstrated herein. It is found that the tensile strength of the 55SiCr springwire decreases with the decrease in the wire speed in online rapid-induction heating, and the plasticity increases. Whereas,the tensile strength of the 55SiCrV steel wire increases with the decrease in the wire speed with the retained high plasticity,which is attributed to the strengthening effect of the dislocations. Through the optimized rapid-induction heating/coolingthermal cycles and intermediate-temperature tempering treatment, the tensile strength of the 55SiCrV steel wire approaches2106 MPa with total elongation of 9.7%. Compared with the 55SiCr spring steel, the addition of V in 55SiCrV spring steelchanges the strengthening and toughening mechanisms via the grain refinement and enhancement in the hardenability andtempering resistance. The finely dispersed V-containing secondary phases are rarely found in the matrix, which indicates thatthe precipitation effect stemming from the addition of V is not the dominant strengthening factor in the online rapid-inductionheat process. The proposed novel online rapid-induction heat treatment provides a promising pathway for the mechanicalproperty improvement of the spring steel.

#Ultrahigh strength spring steel · Online rapid-induction heat treatment · Microstructure · Mechanical property · Vanadium microalloying · Tempering

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