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为了探究喷雾淬火速率的影响因素,搭建了可视化试验平台,通过红外热像仪记录高温金属圆盘在高压喷雾冷却过程中的温度变化,并利用简化的微分能量方程分析热量传递过程。对喷射距离和喷射压力对淬火速率的影响进行了定量研究。结果表明,喷射距离越小,圆盘表面温度下降得越快,当喷射距离降低到一定值时,淬火过程可以避过膜态沸腾阶段,从而使冷却速率大大提高。然而,喷射压力对淬火速率的影响并不呈线性规律。本研究首次确定了淬火过程不产生膜态沸腾的喷射距离,为淬火的工业应用提供了重要的理论依据。
In order to explore the influencing factors of spray quenching rate, a visual test platform was set up. The temperature change of high temperature metal disc during high pressure spray cooling was recorded by infrared thermal imager. The simplified differential energy equation was used to analyze the heat transfer process. The effects of injection distance and injection pressure on quenching rate were studied quantitatively. The results show that the smaller the jet distance is, the faster the disc surface temperature decreases. When the jet distance decreases to a certain value, the quenching process can avoid the membrane boiling stage and the cooling rate is greatly increased. However, the effect of injection pressure on quenching rate is not linear. This study, for the first time, identified the jetting distance that did not produce film boiling during quenching, which provided an important theoretical basis for the industrial application of quenching.