冷却方式对特厚钢板淬火温度均匀性的影响

对特厚钢板采用水槽浸入淬火和超快冷连续淬火两种方式，对比分析持续冷却和间歇冷却对特厚钢板心部、近表面冷速以及厚向温度均匀性的影响规律，阐述特厚钢板淬火特有的心部导热和表面换热特征，建立优化的淬火工艺规程.结果表明，相比于持续连续式淬火，间歇连续式淬火能够在保持特厚钢板心部冷速不降低的前提下，显著减缓钢板表面冷速，提高了厚向温度均匀性.当水冷/空冷时间比为14左右时，优化效果最为明显.

Effects of the Cooling Mode on the Temperature Uniformity of Ultra Heavy Plate Quenching〓

The tank immersion mode and ultra fast continuous cooling mode were adopted for ultra heavy steel plate quenching， through comparing the effects of sustainable cooling and intermittent cooling on the cooling rates of the centre and near surface part and the temperature uniformity along the thickness direction， centre heat conduction and surface heat transfer characteristic of the ultra heavy steel plate during quenching were illustrated. Based on this， optimal quenching schedule was constructed. The results showed that， compared with sustainable continuous quenching， intermittent continuous quenching not only kept the lower surface cooling rate， but also increased centre cooling rate， and the temperature uniformity along the thickness direction was improved remarkably. When the water cooling and air cooling time ratio was 1. 4， the optimization effects appeared obviously.