Detail publikace

Resistance of Plasma Nitrided Austenitic Stainless Steel AISI 304 (X5CrNi18 10)

KUSMIČ, D. ČECH, O. KLAKURKOVÁ, L.

Originální název

Resistance of Plasma Nitrided Austenitic Stainless Steel AISI 304 (X5CrNi18 10)

Typ

článek ve sborníku mimo WoS a Scopus

Jazyk

angličtina

Originální abstrakt

In this paper, austenitic stainless steel AISI 304 (X5CrNi 18 10) has been subjected to lowtemperature plasma nitriding (LTPN) at 400 °C (673 K) in 24H2:8N2 (l/h) and in the reverse working atmosphere of 8H2:24N2 (l/h) marked as LTPN-R, and additionally to high-temperature plasma nitriding (HTPN) at 550 °C (823 K) in 24H2:8N2 (l/h) working atmosphere, for 15h for all PN processes. The microstructure, microhardness, and phase evaluation of the nitrided steel were studied. Nitrogen expanded austenite γN and Fe3N was identified after the LTPN process. After LTPN-R the γN, Fe2N, Fe3N, Fe4N, CrN, and Cr2N phases were identified. The HTPN process led to the formation of an increased volume of αFe, Fe3N Fe4N, and CrN phases. The LTPN techniques led to an increase of surface hardness, from initial 186 ± 3 HV1 (untreated steel) to 281 ± 15 HV1 (for LTPN and LTPN-R). The highest surface hardness reached the HTPN process (734 ± 5 HV1), thanks to the formation of CrN, Fe3N, and Fe4N rich nitride layer on the surface. microhardness profile measurement, scanning electron microscopy (SEM), and light microscopy study showed the formation of thin nitrogen expanded γN layer after LTPN and LTPN-R process, and a very thin nitride layer on the surface and thicker nitrogen expanded γN layer beneath it after HTPN process. The corrosion properties of the untreated, LTPN, LTPN-R, and HTPN treated steel were evaluated using the anodic potentiodynamic polarization tests (PPT) in neutral 2.5% NaCl deaerated solution. The corrosion rate CR (mm/y) increased only approx. 3-times for LTPN, 4-times for LTPN-R to untreated steel. The most negative Ecorr (V) and highest CR values were found after HTPN (increased 44-times to untreated steel) due to reduced passivation ability by chromium depletion caused by the forming of CrN. Additionally, the pitting was evaluated, and the pitting coefficient was calculated as well.

Klíčová slova

AISI 304; nitriing; microstructure; microhardness; phase evolution; corrosion rate

Autoři

KUSMIČ, D.; ČECH, O.; KLAKURKOVÁ, L.

Vydáno

9. 9. 2020

Nakladatel

Brno University of Technology Faculty of Electrical Engineering and Communication Department of Electrical and Electronic Technology

Místo

Brno

ISBN

978-80-214-5889-5

Kniha

Advanced Batteries Accumulators and Fuel Cells – 21st ABAF

Strany od

92

Strany do

95

Strany počet

3

BibTex

@inproceedings{BUT165929,
  author="David {Kusmič} and Ondřej {Čech} and Lenka {Klakurková}",
  title="Resistance of Plasma Nitrided Austenitic Stainless Steel AISI 304 (X5CrNi18 10)",
  booktitle="Advanced Batteries Accumulators and Fuel Cells – 21st ABAF",
  year="2020",
  pages="92--95",
  publisher="Brno University of Technology Faculty of Electrical Engineering and Communication Department of Electrical and Electronic Technology",
  address="Brno",
  isbn="978-80-214-5889-5"
}