热钢圆盘喷水冷却过程的温度场测量与模拟

Measurement and simulation of 45 steel disk temperature field in the water-sprinkled cooling

为了得到喷水淬火工艺参数与工件冷却速度的相互关系,对45钢圆盘试样分别在自然冷却和喷水冷却过程的温度场进行了实测与有限元模拟。在试验中用热电偶和红外测温仪测得试样在两种条件下的冷却曲线,用有限元软件DEFORM进行模拟,通过调整热流密度值,获得热流密度(HF)随表面温度的变化关系;并对所得数据进行拟合,得到热流密度与工件表面温度的函数关系式。该关系式可用来求解热流密度,进而用有限元软件获得试样的温度场的模拟计算值。结果表明,模拟值与实测结果吻合的较好。

In order to obtain the relationship between the cooling parameter and the cooling rate of the work-piece, the temperature field of a 45 steel disk is measured and simulated under the natural cooling and the water-sprinkled cooling. The curve of temperature vs time is measured by thermocouple and infrared ray at the two cooling conditions. The simulation is operated by the FEM software package to attain the relation between the heat flux（HF） and the temperature on the surface of the workpiece. Functions between HF and the external temperature are found by regressing these simulated data, which can be used to calculate HF in reverse, and further more to simulate the quenching process by FEM, the temperature field and the cooling rate field can be obtained. Results show a good agreement between the simulation and experiment.