An aluminized 22MnB5 (Boron) steel sheet, used for structural parts in the automotive industry, was subjected to press-hardening followed by austenitizing, both in a conventional furnace and via the conductive (electric resistance) heating method, an innovative technique based on the Joule’s principle for fast heating of the sheet metal. Conductive heating presents a number of advantages over the in-furnace heating method. These include a more efficient use of energy, as well as the requirement of less time and space for heating, thus lowering costs. After press-hardening was performed using both methods, the microstructural and mechanical characterizations of both specimens were examined for optical microscopy, hardness, tensile strength, and high-speed impact tests. The results showed that the press-hardening process transformed the ferritic–pearlitic microstructure in the as-received state into martensite after die quenching and caused a substantial increase in hardness and strength at the expense of ductility and impact toughness. On the other hand, no significant difference was observed in either the microstructure or mechanical properties with respect to the heating method used. The results obtained in the present investigation concur with the findings of current literature.

中文翻译：

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用传导加热技术研究加压硬化硼钢板的力学性能

一种用于汽车工业结构件的镀铝 22MnB5（硼）钢板经过加压硬化，然后在常规炉中和通过传导（电阻）加热方法进行奥氏体化，这是一种基于快速加热金属板的焦耳原理。与炉内加热方法相比，传导加热具有许多优点。其中包括更有效地利用能源，以及减少加热时间和空间的需求，从而降低成本。使用两种方法进行加压硬化后，通过光学显微镜、硬度、拉伸强度和高速冲击试验检查两种试样的显微结构和机械特性。结果表明，冲压硬化过程在模具淬火后将原始状态的铁素体-珠光体显微组织转变为马氏体，并导致硬度和强度的显着增加，但以塑性和冲击韧性为代价。另一方面，就所使用的加热方法而言，在微观结构或机械性能方面均未观察到显着差异。本次调查获得的结果与当前文献的结果一致。就所使用的加热方法而言，在微观结构或机械性能方面均未观察到显着差异。本次调查获得的结果与当前文献的结果一致。就所使用的加热方法而言，在微观结构或机械性能方面均未观察到显着差异。本次调查获得的结果与当前文献的结果一致。