Q690D钢板的热处理工艺

Heat treatment process of Q690D steel plate

用MMS-200热模拟试验机对Q690D钢板奥氏体连续冷却转变及不同调质工艺对Q690D钢板组织与性能的影响进行了研究。结果表明,当冷却速率为7~15℃/s时,材料组织才能转变为马氏体组织。淬火加热温度780℃时,钢板没有完全奥氏体化,造成组织不均匀。当淬火温度大于840℃时,钢板组织与850℃时相比变化不大。随回火温度升高,试验钢板的强度降低。

Austenite continuous cooling transformation and the effect of different quenching and tempering process on the microstructure and properties of Q690 D steel plate were researched by MMS-200 thermal simulated test machine. The results show that,when the cooling rate is in the range of 7-15 ℃ /s,the microstructure can be transformed to martensite. When the quenching heating temperature is 780 ℃,the microstructure is uneven resulted from uncomplete austenitizing. When the quenching temperature is higher than 840 ℃,the microstructure of the steel plate changes very little. With the increase of tempering temperature,the strength of the steel plate reduces.