Stainless austenitic steels are widely applied in the field of classic mechanical engineering. An important representative of these grades is the material 316L (S31603), which is well established as a standard steel in Additive Manufacturing (AM). Typical austenitic stainless steels contain some main alloying elements, which are described in the following: The formation of an austenitic microstructure is achieved by nickel (Ni). The addition of chromium (Cr) lead to the corrosion resistance of these materials. For resistance to localized corrosion, molybdenum (Mo) can be added.
However, this requires full dissolution of Cr and Mo in the steel matrix. As a consequence, stainless austenites usually exhibit very low carbon and nitrogen contents to prevent chromium carbides and nitrides. But, both alloying elements cannot be classified as being detrimental in stainless austenites in general. In contrast, C and N can also be used to improve mechanical and corrosion resistance.
Based on this knowledge, a high-strength austenite was developed particularly tailored for AM. The mechanical properties of the new development, determined by tensile tests, show twice as high characteristic values (yield strength and ultimate tensile strength) compared to 316L, with simultaneously increased corrosion resistance against chloride ions.
Learning Objectives:
- Upon completion, participant will be able to…describe the influence of alloying elements on the powder atomization.
- Upon completion, participant will be able to…describe the influence of alloying elements on the mechanical and corrosion properties.
