Continues Cooling Transformation Behavior of Low Carbon Mn-Nb-B Steel

Duan, Zheng Tao; Li, Yanmei; Zhu, Fu Xian; Zhang, Hui Yun

doi:10.4028/www.scientific.net/amr.335-336.595

Cited by 3 publications

(1 citation statement)

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“…On the other hand, with the rapidly decreasing temperature, atomic activity is reduced, so the proportion of proeutectoid ferrite in the transformed products is gradually decreased. 29–31 When the cooling rate reaches a critical value (between 0.02 and 0.025 K s −1 ), the nucleation of ferrite would not grow, and the precipitation of proeutectoid ferrite is completely inhibited.…”

Section: Resultsmentioning

confidence: 99%

Continuous cooling transformation behaviour and bainite formation kinetics of new bainitic steel

Zheng

et al. 2016

Materials Science and Technology

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In order to avoid the appearance of soft particles composed of ferrite or pearlite in the actual production of new bainitic steel, the phase transformation behaviour and bainite formation kinetics were investigated by DIL805A dilatometer, optical microscopy, scanning electron microscopy and Vickers-durometer. The results show that the soft particles cannot appear when the cooling rate exceeds 0.025 K s −1 , and this condition can be ensured by direct spray cooling in production. The local activation energy decreases with increasing transformed bainite volume fraction ( f b ), and the average energy is about 136.7 kJ mol −1 . The local Avrami exponent mainly lies between 0.5 and 3 in a wide f b range, indicating that the dominating mechanism of bainite formation is two-dimensional and one-dimensional growth.

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Section: Resultsmentioning

confidence: 99%