Experimental investigation of high-temperature 40H steel blank cooling

The results of the full-scale experiment obtained at high-temperature 40H steel blank cooling with a flow of sub-cooled water are shown. To carry out experiments there is designed and assembled a device for a visual observation and fulfillment complex measurements of blank surface temperatures. For the 40H steel blank with a diameter of 24 mm, by the initial temperature of 800ºC, moving in a cooling area at a speed of m/s the experimental measurements of a surface temperature at cooling with a water flow at a speed of m/s are carried out. The initial water temperature is 20ºC. The measurements of a blank surface temperature were performed with the aid of a thermal imager of NEC TH9100 Pro WRI (Japan) type. There was not observed an intensive bleb steam formation in the flow of strong sub-cooled water. In the water flow at the blank border insignificant steam areas were observed which were carried away at once with a water flow. Changes of a typical temperature in a blank cooled with a water flow according to a time period are shown.