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大型锻件锻造过程中氧化皮是不可避免的,它影响着锻件表面的热交换过程,为向大型锻件锻造工艺的数值模拟提供符合生产实际的材料热物理参数,进行了转子钢26Cr2Ni4 MoV试件的高温加热和空冷试验,并通过反分析的方法测试出26Cr2Ni4 MoV在较厚氧化皮条件下的热物理参数。结果表明,氧化皮对转子钢26Cr2Ni4 MoV的热物理参数有很大影响,无氧化皮时黑度系数为0.64～0.76,有氧化皮时黑度系数为0.3;无氧化皮时锻件与模具间传热参数为1 N.s-1.mm-1.℃-1,有氧化皮时锻件与模具间导热系数为0.105 N.s-1.mm-1.℃-1。
Large scale forging process of the oxide scale is inevitable, which affects the surface of the forging heat exchange process, for the large forgings forging numerical simulation process to provide practical materials with thermal physical parameters, the rotor steel 26Cr2Ni4 MoV specimen High temperature heating and air cooling test, and the thermal physical parameters of 26Cr2Ni4 MoV under thicker scale were tested by back analysis method. The results show that the scale has a great influence on the thermal physical parameters of 26Cr2Ni4 MoV steel. The blackness coefficient is 0.64 ~ 0.76 in the absence of scale and 0.3 in black scale. The thermal parameter is 1 Ns-1.mm-1. ℃ -1. The thermal conductivity between forging and die is 0.105 Ns-1.mm-1. ℃ -1 with scale.