中厚板辊式淬火换热系数的确定方法  

Method for determination of heat transfer coefficient of plate during roller quenching

作　　者：张志敏[1] 余伟[1] 蔡庆伍[1] 

机构地区：[1]北京科技大学冶金工程研究院,北京100083

出　　处：《材料热处理学报》2013年第3期170-175,共6页Transactions of Materials and Heat Treatment

摘　　要：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。Temperature field and stress field of 12MnNiVR steel plate during quenching were calculated in order to determine the optimal coefficient of heat transfer for plate during roller quenching. The determination method of heat transfer coefficient for plate during quenching in high-pressure zone of quenching machine was suggested based on analysis of temperature field and the heat transfer coefficient of 12MnNiVR steel plate with different thickness during quenching in high-pressure zone were determined with the method. Results of stress field show that thermal stress and residual stress is reduced obviously when plate is quenched in low-pressure zone with small coefficient of heat transfer. The average coefficient of heat transfer for 20 mm thickness 12MnNiVR steel plate during quenching in low-pressure zone is determined as 1 kW/（ m2·K）. Difference-value of compressive stress in surface and tensile stress in center of 20 mm thickness 12MnNiVR steel plate after quenching in low-pressure zone with average coefficient of heat transfer 1 kW/（ m2· K） is reduced by 181.2 MPa compared with that of 8 kW/（m2-K）.

关 键 词：中厚板 换热系数 辊式淬火 温度场 应力场 

分 类 号：TG156.31[金属学及工艺—热处理]