论文部分内容阅读
利用有限元模拟软件和实物验证,研究了扭力梁热成形过程中的温度场、微观组织和硬度的变化关系。研究表明:零件的截面形状对成形后零件的温度场分布有直接影响,截面形状差异会造成不同区域与模具接触程度有差异,成形结束后不同区域温度分布也不同;扭力梁不同区域的温度冷却速度有差异,造成不同区域微观组织呈现不同形式,且平均冷却速率与硬度值成正相关关系;热成形后,零件微观组织主要为马氏体组织;部分区域成形时内部会有空腔,坯料与模具接触不紧密,淬火不充分,瞬时冷却速度低,会发生贝氏体和铁素体转变,整个零件呈现典型的高硬度区和低硬度区分布。
The relationship between the temperature field, the microstructure and the hardness of the torsion beam during thermoforming was studied by finite element simulation software and physical verification. The results show that the cross-sectional shape of the parts has a direct influence on the temperature field distribution of the formed parts. The difference of the cross-sectional shapes will result in the difference of the contact degree between the different parts and the mold and the temperature distribution in different regions after the forming. The microstructure of different parts presents different forms, and the average cooling rate has a positive correlation with the hardness value. After thermoforming, the microstructure of the part is mainly martensite; some areas will have cavities, Mold contact is not tight, quenching is not sufficient, instantaneous cooling rate is low, bainite and ferrite transformation will occur, the entire part presents a typical high hardness zone and low hardness zone.