Press hardening using masks during furnace process for partial austenitization

应用研究项目的重点是开发和实现用于生产部分回火钢板金属部件的掩蔽概念。这一概念的基础涉及硼锰钢22MnB5的材料模型增强。必须考虑在加热过程中材料结构的部分结晶化，以便能够有目的地调整部件性能。在炉内工艺中使用掩蔽体，应避免或降低部分空白区域中的奥氏体相变。因此，部件在热冲压工艺后应具有有利的局部变化的特性。通过这种方式，可以优化硼锰部件或者车身结构的碰撞性能。炉内停留时间由通常使用的防腐蚀保护涂层渗透到基本材料中所需的时间来预先确定。在此期间，遮蔽体必须降低温度升高。要以定义的方式调整零部件特性，需要使用适当的遮罩体设计方法。因此，模拟模型必须考虑掩蔽体的热机械性质和能够计算在炉停留时间期间坯料的部分热处理的材料模型。通过这种方法，它将是可能的预测局部变化的组件属性，由于热冲压过程。

The applied research project focusses on the development and realization of a masking concept for producing partial tempered steel sheet metal components. The basement for this concept involves a material model enhancement for the boron-manganese steel 22MnB5. Partial austenitization of the material structure during the heating processes has to be considered to enable a purposeful adjustment of the component properties. Using masking bodies in the furnace process the austenitic phase transformation should be avoided or lowered in partial blank areas. Thus, the component should feature advantageous, local varied properties after hot stamping process. By this means, the crash-performance of the boron-manganese components or rather of the car body structure can be optimized. The furnace dwell time is predetermined by the time need of the usually used cinder protection coating to permeate into the basic material. During this time, a masking body has to lower the temperature increase. To adjust component properties in a defined way an appropriate method for masking bodies design is required. Therefore, simulation models have to consider both the thermo-mechanical properties of the masking body and a material model which is able to compute a partial austenitization of the blanks during furnace dwell time. By this means, it would be possible to predict the local varying components properties due to the hot stamping procedure.