Effect of Mo on the Precipitation Behavior of FB780 Steel with a High Hole-Expanding Ratio at Different Coiling Temperat
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ORIGINAL ARTICLE
Effect of Mo on the Precipitation Behavior of FB780 Steel with a High Hole-Expanding Ratio at Different Coiling Temperatures Wen Liang1,2,3 • Qing Yuan1,2,4 • Sheng Liu1,2 • Wenwei Qiao4 • Guang Xu1,2
Received: 25 September 2019 / Accepted: 7 August 2020 Ó The Indian Institute of Metals - IIM 2020
Abstract The investigations conducted on the effect of molybdenum (Mo) on the precipitation behavior of FB780 steel with the high hole-expanding ratio at different coiling temperatures have been limited. In the present study, base steel without the addition of Mo (Nb–Ti steel) and Nb–Ti– Mo steel with the addition of 0.191% (wt.%) Mo was prepared. Different coiling temperatures were selected on the basis of the process used in industrial production. The results indicated that Mo promoted precipitation at low coiling temperatures, while the volume fraction and size of the precipitates were increased and decreased, respectively, exerting a precipitation strengthening effect. The addition of Mo lowered the optimal coiling temperature, which
& Qing Yuan [email protected] Wen Liang [email protected] Sheng Liu [email protected] Wenwei Qiao [email protected] Guang Xu [email protected] 1
The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, 947 Heping Ave., Qingshan District, Wuhan 430081, Hubei, China
2
Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education, Wuhan University of Science and Technology, Wuhan 430081, China
3
Wuhan Branch of Baosteel Central Research Institute, Qingshan District, Wuhan 430080, Hubei, China
4
Jiangsu Huaneng Cable Company Limited, Gaoyou 225613, Jiangsu, China
would be beneficial in terms of energy saving. In addition, Mo reduced the row width of the interphase precipitation and improved the performance stability of the FB780 steel with high hole-expanding ratio. Keywords Precipitation behavior Molybdenum Hole-expanding ratio Precipitation strengthening Interphase precipitation
1 Introduction The development of microalloyed steels has been continuing for the last several decades owing to their outstanding mechanical properties [1–5]. Microalloyed steels are prepared individually or in a composite with niobium (Nb), vanadium (V), titanium (Ti), and molybdenum (Mo) [6–10]. The microalloying elements are usually present in the steels as solute atoms or precipitates to retard the austenite recrystallization and grain growth in the a phase, and the beneficial effects of Nb have been reported to be the largest compared to the other microalloying elements [11–14]. Nano-scale carbonitride precipitates are able to significantly improve the strength of microalloyed steels through precipitation strengthening based on the Orowan mechanism [15–18]. So far, several studies have been conducted about the effects of microalloying element on the microstructure and properties of steels. In modern automobile manufacturing, FB780 steel as a dual-phase steel with a high hole-expanding ratio,
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