Work

Microstructural characterization of AISI 440C stainless tool steel fabricated by laser powder bed fusion

Year: 2024

Type: conference-paper

Abstract: The microstructure of a stainless tool steel AISI 440C fabricated by laser powder bed fusion (L-PBF) without pre-heating of the build plate was characterized by multi-scale experimental methods. In combination with thermodynamic calculations, the solidification and cooling-down procedures were analyzed with the intention to understand the cracking behavior of high carbon tool steels processed by L-PBF. The results showed a fully austenitic structure in the as-built sample with sub-micro cellular structures and nano-sized carbides decorating the cell walls. Significant segregation exists merely at the intersection of cell walls while it is absent along high angle grain boundaries. Factors contributing to crack-free AISI 440C are discussed, providing guidelines for future L-PBF fabrication of high-carbon tool steels.

Source: IOP Conference Series Materials Science and Engineering

DOI: 10.1088/1757-899x/1310/1/012037

Authors: Z Pan, Y Zhang, M Defer, X Xiao, D Juul Jensen, V K Nadimpalli

Institutions: Technical University of Denmark, Brookhaven National Laboratory, National Synchrotron Light Source II

Language: English

Topic: Additive Manufacturing Materials and Processes

Subfield: Mechanical Engineering

Field: Engineering

Domain: Physical Sciences

Open Access status: diamond

Funder: Villum Fonden

Awards: G2375618255, G5598226300