Nitridation of Three Austenitic Alloys at 1100 °C
Artikel i vetenskaplig tidskrift, 2025

The nitridation of three austenitic high-temperature alloys in 95% N2 + 5% H2 environment at 1100 degrees C was evaluated in terms of gravimetry and investigated by SEM-EDS, EPMA and STEM. Samples made from Alloy 600, 253 MA and 353 MA were exposed for 1 day, 1 week and 3 weeks. Alloy 600 underwent very little nitridation, while 253 MA and especially 353 MA, were heavily affected by nitride precipitation. The nitridation of all three alloys had reached equilibrium after three weeks; the extent of nitridation depending on the chromium activity in the alloy. The kinetics of nitrogen ingress into the alloy depends on nickel concentration, while the rate-determining step in the nitridation process is the nucleation and growth of the nitride precipitates.

SEM

EPMA

Alloy

High-temperature corrosion

STEM

Författare

Tommy Sand

Chalmers, Kemi och kemiteknik, Energi och material

A. Rajagopal

Alleima

Mohammad Sattari

Chalmers, Fysik, Mikrostrukturfysik

S. Bigdeli

Höganäs

M. Haettestrand

Alleima

Jan-Erik Svensson

Chalmers, Kemi och kemiteknik, Energi och material

Mats Halvarsson

Chalmers, Fysik, Mikrostrukturfysik

Lars-Gunnar Johansson

Materialkemi

HIGH TEMPERATURE CORROSION OF MATERIALS

2731-8397 (ISSN) 2731-8400 (eISSN)

Vol. 102 2 10

Ämneskategorier (SSIF 2025)

Metallurgi och metalliska material

Yt- och korrosionsteknik

Annan materialteknik

DOI

10.1007/s11085-025-10331-9

Mer information

Senast uppdaterat

2025-03-27