Mirjam Leban (Author), Bojan Zajec (Author), Bojan Podgornik (Author), Črtomir Donik (Author), Patricia Jovičević Klug (Author), Miha Hren (Author), Andraž Legat (Author)

Abstract

A low carbon/ high chromium martensitic stainless steel, X17CrNi16-2, was heat treated using two different hardening and tempering regimes (1050 ◦ C/480 ◦ C or 980 ◦C/600 ◦C) — promoting either a high strength or high toughness state, respectively and further combined with deep cryogenic treatment (DCT) at 196 ◦C for 24 h. Over recent years DCT has been recognized as a promising technique to improve the properties of steel, predominantly with respect to its tensile strength, toughness and wear resistance. The influence of DCT on the hydrogen embrittlement resistance of martensitic stainless steel has not yet, however, been reported. A slow strain rate tensile test (SSRT) with simultaneous cathodic hydrogen charging was selected as the method to assess potential susceptibility to hydrogen embrittlement (HE). Relatively low-intensity hydrogen charging, utilizing a constant current density of 0.1 mA/cm2, in a non-corrosive, slightly alkaline buffer solution, led to a clear reduction in the ultimate tensile stress. This reduction, and therefore the HE susceptibility, was more pronounced in the steel with a higher strength (i.e. that subject to the 1050 ◦C/ 480 ◦C heat treatment condition). Furthermore, DCT did not appear to have any impact on the steel’s mechanical properties in the presence of hydrogen. Fractographic analysis showed clear evidence of HE in the hydrogen-charged specimens. This paper presents results of the SSRT tests and further fractography results, and discusses the impact of conventional and deep cryogenic treatment on HE susceptibility.

Keywords

martenzitno nerjavno jeklo;globoko kriogensko podhlajevanje;vodikova krhkost;test s počasno hitrostjo rasti natezne deformacije;martensitic stainless steel;deep cryogenic treatment;hydrogen embrittlement;slow strain rate tensile test;

Data

Language: English
Year of publishing:
Typology: 1.01 - Original Scientific Article
Organization: ZAG - Slovenian National Building and Civil Engineering Institute
Publisher: Elsevier
UDC: 54
COBISS: 194430723 Link will open in a new window
ISSN: 1873-1961
Views: 35
Downloads: 39
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Other data

Secondary language: Slovenian
Secondary keywords: martenzitno nerjavno jeklo;globoko kriogensko podhlajevanje;vodikova krhkost;test s počasno hitrostjo rasti natezne deformacije;
Source comment: Received 20 February 2024; Received in revised form 6 April 2024; Accepted 2 May 2024; Nasl. z nasl. zaslona; Opis vira z dne 6. 5. 2024;
Pages: str. 1-11
Volume: ǂVol. ǂ162
Issue: [article no.] 108403
Chronology: Aug. 2024
DOI: 10.1016/j.engfailanal.2024.108403
ID: 23769234