特厚钢板的变周期淬火工艺优化与传热分析

Optimization of variable period quenching process and heat transfer analysis of extra-thick steel plate

利用组合式淬火试验装置,完成了80 mm厚钢板变周期淬火试验,分析了水空时间比、射流速度等参数对钢板传热的影响规律。基于建立的特厚钢板三维有限元仿真模型模拟了钢板淬火过程温度场,模型的平均冷速误差小于5%。结果表明:相比于其他冷却工艺,射流速度为16 m/s时,(w20+a10)工艺周期长度的设置可充分发挥温度梯度对表面返温效果和钢板内部冷速的提升作用,有效地避免了心部冷速下降明显的问题,钢板的整体冷却均匀度显著提高。

The variable cycle quenching test of 80 mm thick steel plate was completed by using the combined quenching test device.The effects of water-to-air time ratio,jet velocity and other parameters on the heat transfer of the steel plate were analyzed.Based on the established three-dimensional finite element simulation model of extra-thick steel plate,the temperature field of the steel plate quenching process is simulated,and the average cooling rate error of the model is less than 5%.The results show that compared with other cooling processes,when the jet speed is 16 m/s,the setting of(w20+a10)process cycle length can give full play to the effect of temperature gradient on surface back temperature and the improvement of internal cooling speed of the steel plate,effectively avoid the problem of obvious decrease of center cooling speed,and significantly improve the overall cooling uniformity of the steel plate.