25-27 April 2022
Conventum Conference Center
Europe/Vienna timezone

Properties of a tool steel-austenitic stainless steel functionally graded material produced by direct laser metal deposition

26 Apr 2022, 15:00
20m
Room 1

Room 1

Oral Presentation Additive manufacturing Additive Manufacturing

Speaker

Massimo Pellizzari (University of Trento, Dpt. Industrial Engineering)

Description

Functionally Graded Materials (FGM) represent an interesting innovation, compared to bulk materials, as they allow a continuous properties variation in components undergoing complex solicitations in service. Laser Additive Manufacturing by Direct Laser Metal Deposition (DLMD) is one of the most important processes to manufacture FGMs. It is based on a material in the form of powder or wire that is melted and deposed by a laser to achieve layer-by-layer structure.
This work focuses on a FGM, made of Fe55 (0.35%wt C, 7% Cr, 2.2%Mo, 1.1% Mn, 0.3% Si) tool steel and AISI316 stainless steel, obtained by direct laser metal deposition (DLMD). The chemical composition was observed to change almost linearly, and also the microhardness profile confirmed a smooth transition from 700 to 200HV between the two materials. The solidification structure was mainly dendritic: an almost fully martensite microstructure was observed on the Fe55 side, gradually chancing to austenite moving towards the stainless steel. Only minor micro- and nanometric porosity was observed. Finally, the corrosion resistance assessed by ASTM G102-89 tests, confirmed the increasing corrosion resistance on the stainless steel rich side.

Speaker Country Italia

Primary author

Massimo Pellizzari (University of Trento, Dpt. Industrial Engineering)

Co-authors

Sasan Amirabdollahian (University of Trento) Dr Mattia Scottini (University of Trento)

Presentation Materials

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