Laser Re-melting of Prealloyed Steel Powders to High Density

摘要

This paper presents recent data on the Direct Metal Laser Re-melting (DLMR) of H13 hot work die steel powders using CW CO_2 and Nd : YAG laser systems. The relationship between alloy composition, microstructure, post scanned density and scan conditions (Laser power, spot size and scan speed) are described for single track, single layer and multi-layer constructions. Densities up to 90% are possible with H13 multi-layer constructions but thermal cracking was present.