WEB On the influence of defects on the mechanical behavior of AISI H13 manufactured by Electron Beam Melting (EBM)
Martensitic steels are the most common materials used in tooling industry. Therefore, these steels are in focus of many studies using additive manufacturing technologies, especially to build complex geometric structures such as tools with sophisticated internal cooling channels. Up to now, most of the studies focus on the selective laser melting (SLM) technology. However, due to the distinct brittleness of high strength steels, SLM faces many problems, e.g. related to residual stress induced cracking. In contrast, Electron Beam Melting (EBM) -a powder bed based process using electrons to locally melt the powder- offers several process inherent advantages. The electron beam can be deflected at high speed to heat up the powder bed up to 1000°C, eventually reducing the residual stresses. The present work introduces and discusses results on processing, microstructure, chemical composition and mechanical properties of AISI H13 produced via EBM. The specimens built are virtually crack-free and, thus, are characterized by a high density. Furthermore, the fine grained microstructure established results in a high ultimate strength and an even slightly higher failure strain as compared to conventionally processed AISI H13.