Materials Transactions Online

Materials Transactions, Vol.58 No.02 (2017) pp.186-195
© 2017 The Japan Institute of Metals and Materials

Effects of Alloying Elements on Static Recrystallization Behavior of Work-Hardened Austenite of High Carbon Low Alloy Steel

Manabu Kubota1, Yukiko Kobayashi2, Kohsaku Ushioda3 and Jun Takahashi2

1Steel Research Laboratories, Nippon Steel & Sumitomo Metal Corporation, Amagasaki 660-0891, Japan
2Advanced Technology Research Laboratories, Nippon Steel & Sumitomo Metal Corporation, Futtsu 293-8511, Japan
3Technical Development Bureau, Nippon Steel & Sumitomo Metal Corporation, Futtsu 293-8511, Japan

Many studies have investigated the effect of alloying elements on the recrystallization behavior of work-hardened austenite. However, the recrystallization behavior of high carbon low alloy steel has not yet been systematically investigated. In this study, the effects of alloying elements (Al, Nb, V, Ti, and B) are examined by means of a double-hit compression test, transmission electron microscopy (TEM) observation and atom probe tomography (APT) analysis. The following conclusions were obtained:

(1) When alloying elements are in solution, Nb and Ti have an equally strong effect on inhibiting recrystallization, followed by V.

(2) When the deformation and holding temperature becomes low, the recrystallization is significantly inhibited by adding 0.1% V.

(3) Fine particles were not observed by APT in the 0.1%V steel, which shows the strong inhibition effect on recrystallization. The solute V content measured by APT decreased as the holding time increased, and recrystallization commenced at the time when relatively coarse precipitates were formed.

This Paper was Originally Published in Japanese in J. Japan Inst. Met. Mater. 80 (2016) 620-629.

[doi:10.2320/matertrans.M2016343]

(Received 2016/09/28; Accepted 2016/11/29; Published 2017/01/25)

Keywords: recrystallization, low alloy steel, high carbon steel, ausforming, alloying element

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