Influence of heat treatment on properties of SD251-PH1 composite produced by additive SLM technology

This study evaluates how heat treatment affects the structure and properties of the engineered composite material SD251-PH1. This material was formed by mixing two powder blends in a weight ratio of 90 wt. % WC-Co powder SD251 with 10 wt. % of a PH1 precipitation hardening powder of the stainless st...

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Bibliographic Details
Published in:IOP conference series. Materials Science and Engineering 2020-01, Vol.723 (1), p.12003
Main Authors: Bricín, David, Jansa, Zdeněk, Somr, Josef, Elmanová, Andrea, Kříž, Antonín
Format: Article
Language:English
Subjects:
Chemical composition
Composite materials
Diamond pyramid hardness
Evaluation
Heat treating
Heat treatment
Mechanical properties
Phase composition
Phase transformation
Porosity
Precipitation hardening
Precipitation hardening steels
Precipitation heat treatment
SLM technology
Stainless steels
Technology assessment
Tungsten carbide
WC-Co
Wear resistance
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Summary:This study evaluates how heat treatment affects the structure and properties of the engineered composite material SD251-PH1. This material was formed by mixing two powder blends in a weight ratio of 90 wt. % WC-Co powder SD251 with 10 wt. % of a PH1 precipitation hardening powder of the stainless steel. Samples were prepared from this mixture on an SLM additive device. The printed samples were then divided into groups. Some of them were left in the initial state and the rest were used for heat treatment based on the standard AMS 5659. Light and electron microscopy metallographic analysis together with X-ray diffraction analysis were then used to evaluate structural and phase changes in the prototype samples. The main attention was paid to changes in the phase composition of the samples. In addition, changes in the size and shape of the pores and tungsten carbide (WC) grains were studied. The metallographic analysis was supplemented by an evaluation of the changes in their mechanical properties and wear resistance. Vickers hardness measurements and the ball on disc test were used for this purpose. The experiments showed that the selected heat treatment processes precipitated new structural phases which differed from the original sample structure in terms of shape, size, chemical composition, and mechanical properties.
ISSN:1757-8981
1757-899X
DOI:10.1088/1757-899X/723/1/012003