3Cr2NiMo钢模块锻后热处理的数值模拟

以3Cr2NiMo模具钢锻造模块为研究目标,通过JMatPro软件计算获得其热物性参数,利用Deform-3D软件对其锻后热处理进行了数值模拟研究,最后进行了试验验证。结果表明:淬火过程中模块外表面的冷速大于心部;从心部到表面,马氏体转变出现不等时现象,淬火后从表面到心部的组织分布依次为马氏体、贝氏体和铁素体。等效应力沿厚度方向分布较均匀,但在棱边处出现应力集中现象;硬度值的分布与马氏体的分布呈正相关,表面的平均硬度值为34.86 HRC。试验验证测得的马氏体层平均深度为45 mm,表面平均硬度为36.23 HRC,模拟结果与试验结果的误差在10%以内,具有较好的吻合度。

Numerical simulation of heat treatment for 3 Cr2 NiMo steel module bulk after forging

Taking the forging module of 3Cr2NiMo die steel as the research object,the thermal physical parameters of which were calculated by JMatPro software.And the heat treatment after forging was studied by means of numerical simulation using Deform-3D software,the test verification was made at last.The results show that,the cooling rate of the outer surface of the module is higher than that of the core during quenching.The martensite transformation from the core to the surface does not simultaneously occur and the microstructure distribution from the surface to the core after quenching is martensite,bainite and ferrite in turn.The equivalent stress distribution along thickness direction is more uniform,but there is stress concentration at the edge position.The distribution of hardness values is positively correlated with the martensite distribution,and the average hardness value of the surface is 34.86 HRC.Meanwhile,the average thickness of martensite layer is45 mm and the average hardness of surface is 36.23 HRC by the test verification.The error results between simulation and test are less than 10%,which has good accuracy.