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Evaluation of the Properties of an Electro-Sinter-Forged Bearing Steel
: Received: 15 September 2020 / Approved: 16 September 2020 / Online: 16 September 2020 (12:13:25 CEST)
A peer-reviewed article of this Preprint also exists.
Journal reference: Metals 2021
In this study one of the most innovative sintering techniques up to date was evaluated: Electro-Sinter-Forging (ESF). Despite it has been proved to be effective in densifying several different metallic materials and composites, bearing steels such as 100Cr6 have never been processed so far. Pre-alloyed Astaloy CrM powders have been ad-mixed with either graphite or graphene and then processed by ESF to produce a 100Cr6 equivalent composition. Porosity has been evaluated by optical microscopy and compared to that one of 100Cr6 commercial samples. Mechanical properties such as hardness and transverse rupture strength were tested on samples produced by employing different process parameters and then submitted to different treatments (machining, heat treatment). The experimental characterization highlighted that porosity is the factor mostly affecting mechanical resistance of the samples, correlating linearly to the transverse rupture strength. Hardness on the other side does not correlate to the mechanical resistance because process related cracking has a higher effect on the final properties. Promising results were obtained that give room to the sinterability by ESF of materials difficult to sinter by conventional press and sinter techniques.
electro sinter forging; powder metallurgy; capacitor discharge sintering; 100Cr6
MATERIALS SCIENCE, Metallurgy
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