Safety-relevant components in automobiles require materials that combine high strength with sufficient residual ductility and high-energy absorption. A graded thermo-mechanical treatment of the press-hardening steel 22MnB5 with graded microstructure can provide a material with such properties. Different austenitization temperatures, cooling and forming conditions within a sheet part lead to the development of microstructures with mixed phase compositions. To determine the resulting phase contents in such graded processed parts, a large number of dilatometric tests are usually required. With a non-contact characterization method, it is possible to detect local phase transformations on an inhomogeneously treated flat steel specimen. For press-hardening steel after heat treatment and thermo-mechanical processing, correlations between austenitization temperature, hot deformation strain, microstructure, and hardness are established.

汽车中与安全相关的部件需要结合了高强度，足够的残余延展性和高能量吸收性的材料。对具有分级微观结构的压制硬化钢22MnB5进行分级热机械处理可以提供具有这种性能的材料。片状部件内不同的奥氏体化温度，冷却和成形条件导致具有混合相组成的微结构的发展。为了确定这种分级加工零件中的最终相含量，通常需要进行大量的膨胀试验。使用非接触特性分析方法，可以检测在不均匀处理的扁钢试样上的局部相变。对于热处理和热机械加工后的压力硬化钢，