HEAT TREATMENT INFLUENCE ON HARDNESS AND MICROSTRUCTURE OF ADAM MANUFACTURED 17-4 PH
Journal Title: Jurnalul Stiintific TURBO - Year 2018, Vol 5, Issue 2
Abstract
The influence of heat treatment on the main characteristics of atomic diffusion additive manufactured 17-4 PH stainless steel was studied. Several investigations such as chemical micro-composition, porosity analysis, microstructural analysis and hardness measurement were done in order to assess the properties of the steel as compared with those provided or recommended by technical data sheets for the material produced by this additive manufacturing method. The average porosity experimentally identified was 0.128%, value lower as compared with the porosity indicated by the technical data sheet, which prove that high-density materials can be produced by ADAM method. Microstructural SEM investigation of the as printed steel have shown a structure formed by martensite and ferrite. After an optimized heat treatment, in quenched state from 1050°C in air, martensite and ferrite with residual austenite at grain boundary were noticed and after a further tempering at 450°C ferrite was revealed as well at the grain boundaries. After applying the optimized heat treatment, an average hardness of 28HRC was obtained which is in very good agreement with the hardness values reported for additive manufactured 17-4 PH.
Authors and Affiliations
Mihaela Raluca CONDRUZ, Alexandru PARASCHIV, Cristian PUSCASU
Keywords
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