Manufacturing of powder metallurgical B-alloyed tool steels on an industrial scale

该转让项目是基于研究项目“硼合金工具钢”（项目编号232707733）。在该项目中，全面了解了元素硼在工具钢中的作用和相互作用，包括凝固过程中和固态下的显微组织形成过程，以及形成的硼化物和碳硼化物的微观性能。通过对Fe-C-B系中合金元素的作用和相互作用的认识，获得了摩擦学和机械性能超过常规冷作工具钢的实验室合金，同时降低了合金成本。通过在“Tooling 2019”会议上展示这些发现，Deutsche Edelstahlwerke GmbH意识到了这一发展，并对硼合金粉末冶金工具钢的大规模工业生产表示了极大的兴趣。在实验室规模上对硼合金冷作工具钢的微观结构形成过程有了基本的了解之后，必须回答关于粉末雾化、粉末加工和相关性能的几个新的科学和技术问题。基于先前研究项目“硼合金钢”的知识状态，此处应用的转移项目旨在开发通过气体雾化制造的硼合金工具钢牌号，并可使用粉末床熔融激光束/金属（PBF-LB/M）和热等静压（HIP）技术进行进一步加工。为此，应使用两种基本合金的例子来说明硼合金冷作钢的潜力。这些发展有助于获得前经济知识。目前正在实施以下两个发展优先事项：1.开发可使用PBF-LB/M进行加工的硼合金化工具钢，而无需进行基板预热等额外措施。2.二次硬化硼合金粉末冶金工具钢作为热等静压产品的开发。

This transfer project is based on the research project "B-alloyed tool steels" (project number 232707733). In the project, a comprehensive understanding of the effect and interactions of the element boron in tool steels regarding the microstructure formation processes during solidification and in the solid-state, as well as the micro-properties of the borides and carboborides formed, was gathered. With the knowledge of the effect and the respective interactions of the alloying elements in the Fe-C-B system, laboratory alloys were derived whose tribological and mechanical properties exceed those of conventional cold work tool steels at the same time as lower alloy costs. By presenting these findings at the “Tooling 2019” conference, Deutsche Edelstahlwerke GmbH became aware of this development and signaled a great deal of interest in the large-scale industrial production of B-alloyed PM tool steels. After a fundamental understanding of the microstructure formation processes of B-alloyed cold work tool steels has been developed on a laboratory scale, several new scientific and technological questions regarding powder atomization, powder processing, and the associated properties must be answered. Based on the state of knowledge of the previous research project, "B-alloyed steels", the transfer project applied here aims to develop B-alloyed tool steel grades that are manufactured by gas atomization and can be further processed with the technologies Powder-Bed-Fusion Laser-Beam/Metal (PBF-LB/M) and hot isostatic pressing (HIP). For this purpose, the potential of B-alloyed cold work steels should be shown using the example of two basic alloys. The developments serve to gain pre-economic knowledge. The following two development priorities are being pursued: 1. Development of B-alloyed tool steel that can be processed using PBF-LB/M without additional measures such as preheating of the base plate. 2. Development of a secondary hardening B-alloy PM tool steel as a HIP product.