Continuous cooling transformation behavior of high-strength Q690D heavy steel plate

doi:10.13251/j.issn.0254-6051.2022.09.030

Abstract

Abstract: By using Gleeble-1500 thermo-simulator along with microstructure and hardness analysis, the continuous cooling transformation (CCT) curves of Q690D heavy steel plate were measured at different cooling rates. The results demonstrate that the proeutectoid ferrite and pearlite zones are observed at slow cooled rates. When the cooling rates reaches 3 ℃/s,the lath bainite appears. At larger range cooling rates, the microstructure of granular bainite and granular+lath bainite can be obtained for the tested steel. Moreover, when the cooling rate reaches 15 ℃/s, the martensite can be observed which indicates that the hardenability of the tested steel is better and the hardness values have little change. The hardness values of different thickness sections keep almost unchanged of the quenched and tempered Q690D heavy steel plate, the microstructure are uniformity. The microstructure and harness values for simulated specimens show the highly consistent with the Q690D heavy steel plate actually produced.

Key words: Q690D heavy steel plate, cooling rate, microstructure, CCT curves

CLC Number:

TG142.1

Li Jing, Liu Chen, Yang Yuehui, Yuan Shaoqiang, Ai Chenguang. Continuous cooling transformation behavior of high-strength Q690D heavy steel plate[J]. Heat Treatment of Metals, 2022, 47(9): 171-174.

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