The Effect of Heat Treatment and Surface Hardening of 3D Printed Austenitic Stainless Steel AISI316l on Corrosion and Wear Properties

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Abstract

The present work focuses on the effect of heat treatment and surface hardening on the microstructure, wear characteristics and corrosion resistance, of 316L stainless steel produced
by Selective Laser Melting (SLM). Specifically, the high temperature treatments austenitisation, high temperature solution nitriding (HTSN) and a new “active austenitisation” treatment, performed with a controlled low partial pressure of nitrogen, were investigated. Additionally, low temperature surface nitriding (LTSN) was investigated for surface hardening. Gaseous thermochemical treatments are well suited for SLM parts, as uniform hardening is achieved on all surfaces exposed to the reactive gas. The wear resistance was tested in a pin-on-disc setup under dry conditions using an AISI 52100 ball as a counterpart, revealing significantly higher wear resistance after LTSN treatment, due to increased surface hardness, while a significant reduction in wear resistance was observed after HTSN treatment. High temperature treatments resulted in the removal of both melt-pool and cellular structures, resulting in a more homogenous material. This lead to improved corrosion resistance as reflected by a lower current density in the passive region during cyclic potentiodynamic polarization testing (CPP) LTSN treatments lead to dramatically increased pitting potentials and improved repassivation characteristics.
Original languageEnglish
Title of host publicationProceedings of the 10th European Stainless Steel Conference – Science and Market and 6th European Duplex Stainless Steel Conference & Exhibition (ESSC & DUPLEX 2019)
PublisherAustrian Society for Metallurgy and Materials
Publication date2019
Pages42-52
ISBN (Print)978-1-7138-0301-0
Publication statusPublished - 2019
EventESSC & DUPLEX 2019 - Vienna, Austria
Duration: 30 Sep 20192 Oct 2019

Conference

ConferenceESSC & DUPLEX 2019
CountryAustria
CityVienna
Period30/09/201902/10/2019

Keywords

  • Selective Laser Melting
  • AISI 316L
  • Corrosion
  • Wear
  • Heat treatment
  • Gaseous nitriding

Cite this

Valente, E. H., Christiansen, T. L., & Somers, M. A. J. (2019). The Effect of Heat Treatment and Surface Hardening of 3D Printed Austenitic Stainless Steel AISI316l on Corrosion and Wear Properties. In Proceedings of the 10th European Stainless Steel Conference – Science and Market and 6th European Duplex Stainless Steel Conference & Exhibition (ESSC & DUPLEX 2019) (pp. 42-52). Austrian Society for Metallurgy and Materials.