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为了确定中厚板辊式淬火过程中的最佳换热系数,进行了12MnNiVR钢板淬火过程中的温度场和应力场计算。依据温度场分析提出了中厚板在淬火机高压区内淬火过程中换热系数的确定方法,并用该方法确定了不同厚度12MnNiVR钢板在高压区淬火的换热系数。应力场分析表明,在低压区采用低的换热系数,可显著降低钢板淬火过程中产生的热应力及残余应力。20mm厚12MnNiVR钢板低压区淬火,平均换热系数确定为1 kW/(m2.K),与采用8 kW/(m2.K)相比,钢板表面残余压应力与中心残余拉应力的差值可降低181.2 MPa。
In order to determine the optimal heat transfer coefficient of plate quenching process, the temperature field and stress field of 12MnNiVR steel during quenching process were calculated. Based on the analysis of temperature field, the method to determine the heat transfer coefficient of plate during quenching in the high-pressure zone of quenching machine was put forward. The heat transfer coefficient of quenching of 12MnNiVR steel with different thickness was determined by this method. Stress field analysis shows that the use of low heat transfer coefficient in the low pressure region can significantly reduce the thermal stress and residual stress generated during quenching of steel plate. The average heat transfer coefficient of 20mm thick 12MnNiVR steel is quenched in the low-pressure zone, and the average heat transfer coefficient is 1 kW / (m2.K). The difference between the residual compressive stress on the steel surface and the residual stress in the center can be compared with that of 8 kW / (m2.K) Lowering 181.2 MPa.