Effect of prior austenite grain morphology on hydrogen embrittlement behaviour under plastic straining in as-quenched 500 HBW steels

Renata Latypova; Tun Tun Nyo; Oskari Seppälä; Eric Fangnon; Yuriy Yagodzinskyy; Saara Mehtonen; Hannu Hänninen; Jukka Kömi; Sakari Pallaspuro

doi:10.1016/j.prostr.2022.12.110

Effect of prior austenite grain morphology on hydrogen embrittlement behaviour under plastic straining in as-quenched 500 HBW steels

Renata Latypova^*, Tun Tun Nyo, Oskari Seppälä, Eric Fangnon, Yuriy Yagodzinskyy, Saara Mehtonen, Hannu Hänninen, Jukka Kömi, Sakari Pallaspuro

^*Corresponding author for this work

Department of Mechanical Engineering

Research output: Chapter in Book/Report/Conference proceeding › Conference article in proceedings › Scientific › peer-review

2 Citations (Scopus)

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Abstract

Prior austenite grain (PAG) structure is an important factor influencing hydrogen embrittlement (HE) susceptibility of ultrahigh-strength steels. In this study, the effect of PAG shape and size on HE behaviour is investigated using a novel tuning-fork testing method and hydrogen thermal desorption spectroscopy (TDS). Different PAG structures were acquired via re-austenitization (860 °C = A860, 960 °C = A960) and rapid quenching of an as-received 500 HBW direct-quenched (DQ) steel, which has an auto-tempered lath-martensitic microstructure and elongated PAG morphology. Fractography reveals different crack propagation mechanisms depending on the PAG shape. With the elongated PAG structure, hydrogen-induced crack propagation transverse to elongated PAGs was transgranular quasi-cleavage. Propagation was partially intergranular with the equiaxed PAG structures, regardless of the PAG size, leading to equally faster fracture. The TDS results show that there are no significant differences between the total hydrogen contents, but re-austenitized A860 and A960 steels contain a higher fraction of weakly trapped hydrogen. This indicates that the PAG boundaries are not the dominant hydrogen traps, and the different crack propagation mechanisms are rather linked to the geometrical shape of the grain structure.

Original language	English
Title of host publication	23rd European Conference on Fracture, ECF 2022
Editors	Pedro Moreira, Luis Reis
Publisher	Elsevier
Pages	871-878
Number of pages	8
ISBN (Electronic)	978-1-7138-7030-2
DOIs	https://doi.org/10.1016/j.prostr.2022.12.110
Publication status	Published - 2022
MoE publication type	A4 Conference publication
Event	European Conference on Fracture - Funchal, Portugal Duration: 27 Jun 2022 → 1 Jul 2022 Conference number: 23

Publication series

Name	Procedia Structural Integrity
Volume	42
ISSN (Electronic)	2452-3216

Conference

Conference	European Conference on Fracture
Abbreviated title	ECF
Country/Territory	Portugal
City	Funchal
Period	27/06/2022 → 01/07/2022

Keywords

hydrogen embrittlement
prior austenite grain structure
steel
TDS
tuning-fork test

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10.1016/j.prostr.2022.12.110Licence: CC BY-NC-ND

1-s2.0-S2452321622006679-main-2Final published version, 1.31 MBLicence: CC BY-NC-ND

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Latypova, R., Nyo, T. T., Seppälä, O., Fangnon, E., Yagodzinskyy, Y., Mehtonen, S., Hänninen, H., Kömi, J., & Pallaspuro, S. (2022). Effect of prior austenite grain morphology on hydrogen embrittlement behaviour under plastic straining in as-quenched 500 HBW steels. In P. Moreira, & L. Reis (Eds.), 23rd European Conference on Fracture, ECF 2022 (pp. 871-878). (Procedia Structural Integrity; Vol. 42). Elsevier. https://doi.org/10.1016/j.prostr.2022.12.110

@inproceedings{06deb255b2c44e7bae8cff14e67679eb,

title = "Effect of prior austenite grain morphology on hydrogen embrittlement behaviour under plastic straining in as-quenched 500 HBW steels",

abstract = "Prior austenite grain (PAG) structure is an important factor influencing hydrogen embrittlement (HE) susceptibility of ultrahigh-strength steels. In this study, the effect of PAG shape and size on HE behaviour is investigated using a novel tuning-fork testing method and hydrogen thermal desorption spectroscopy (TDS). Different PAG structures were acquired via re-austenitization (860 °C = A860, 960 °C = A960) and rapid quenching of an as-received 500 HBW direct-quenched (DQ) steel, which has an auto-tempered lath-martensitic microstructure and elongated PAG morphology. Fractography reveals different crack propagation mechanisms depending on the PAG shape. With the elongated PAG structure, hydrogen-induced crack propagation transverse to elongated PAGs was transgranular quasi-cleavage. Propagation was partially intergranular with the equiaxed PAG structures, regardless of the PAG size, leading to equally faster fracture. The TDS results show that there are no significant differences between the total hydrogen contents, but re-austenitized A860 and A960 steels contain a higher fraction of weakly trapped hydrogen. This indicates that the PAG boundaries are not the dominant hydrogen traps, and the different crack propagation mechanisms are rather linked to the geometrical shape of the grain structure.",

keywords = "hydrogen embrittlement, prior austenite grain structure, steel, TDS, tuning-fork test",

author = "Renata Latypova and Nyo, {Tun Tun} and Oskari Sepp{\"a}l{\"a} and Eric Fangnon and Yuriy Yagodzinskyy and Saara Mehtonen and Hannu H{\"a}nninen and Jukka K{\"o}mi and Sakari Pallaspuro",

note = "Funding Information: This research was supported by Business Finland Oy and Academy of Finland (#337108). The projects ISA – Intelligent Steel Applications and FOSSA– Fossil-Free Steel Applications, are acknowledged. The authors wish to thank the technical staff of the Materials and Mechanical Engineering unit at the University of Oulu for their help with experimental work and sample preparation. Funding Information: This research was supported by Business Finland Oy and Academy of Finland (#337108). The projects ISA - Intelligent Steel Applications and FOSSA- Fossil-Free Steel Applications, are acknowledged. The authors wish to thank the technical staff of the Materials and Mechanical Engineering unit at the University of Oulu for their help with experimental work and sample preparation. Publisher Copyright: {\textcopyright} 2022 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the scientific committee of the 23 European Conference on Fracture - ECF23.; European Conference on Fracture, ECF ; Conference date: 27-06-2022 Through 01-07-2022",

year = "2022",

doi = "10.1016/j.prostr.2022.12.110",

language = "English",

series = "Procedia Structural Integrity",

publisher = "Elsevier",

pages = "871--878",

editor = "Pedro Moreira and Luis Reis",

booktitle = "23rd European Conference on Fracture, ECF 2022",

address = "Netherlands",

}

Latypova, R, Nyo, TT, Seppälä, O, Fangnon, E, Yagodzinskyy, Y, Mehtonen, S, Hänninen, H, Kömi, J & Pallaspuro, S 2022, Effect of prior austenite grain morphology on hydrogen embrittlement behaviour under plastic straining in as-quenched 500 HBW steels. in P Moreira & L Reis (eds), 23rd European Conference on Fracture, ECF 2022. Procedia Structural Integrity, vol. 42, Elsevier, pp. 871-878, European Conference on Fracture, Funchal, Portugal, 27/06/2022. https://doi.org/10.1016/j.prostr.2022.12.110

Effect of prior austenite grain morphology on hydrogen embrittlement behaviour under plastic straining in as-quenched 500 HBW steels. / Latypova, Renata; Nyo, Tun Tun; Seppälä, Oskari et al.
23rd European Conference on Fracture, ECF 2022. ed. / Pedro Moreira; Luis Reis. Elsevier, 2022. p. 871-878 (Procedia Structural Integrity; Vol. 42).

Research output: Chapter in Book/Report/Conference proceeding › Conference article in proceedings › Scientific › peer-review

TY - GEN

T1 - Effect of prior austenite grain morphology on hydrogen embrittlement behaviour under plastic straining in as-quenched 500 HBW steels

AU - Latypova, Renata

AU - Nyo, Tun Tun

AU - Seppälä, Oskari

AU - Fangnon, Eric

AU - Yagodzinskyy, Yuriy

AU - Mehtonen, Saara

AU - Hänninen, Hannu

AU - Kömi, Jukka

AU - Pallaspuro, Sakari

N1 - Conference code: 23

PY - 2022

Y1 - 2022

N2 - Prior austenite grain (PAG) structure is an important factor influencing hydrogen embrittlement (HE) susceptibility of ultrahigh-strength steels. In this study, the effect of PAG shape and size on HE behaviour is investigated using a novel tuning-fork testing method and hydrogen thermal desorption spectroscopy (TDS). Different PAG structures were acquired via re-austenitization (860 °C = A860, 960 °C = A960) and rapid quenching of an as-received 500 HBW direct-quenched (DQ) steel, which has an auto-tempered lath-martensitic microstructure and elongated PAG morphology. Fractography reveals different crack propagation mechanisms depending on the PAG shape. With the elongated PAG structure, hydrogen-induced crack propagation transverse to elongated PAGs was transgranular quasi-cleavage. Propagation was partially intergranular with the equiaxed PAG structures, regardless of the PAG size, leading to equally faster fracture. The TDS results show that there are no significant differences between the total hydrogen contents, but re-austenitized A860 and A960 steels contain a higher fraction of weakly trapped hydrogen. This indicates that the PAG boundaries are not the dominant hydrogen traps, and the different crack propagation mechanisms are rather linked to the geometrical shape of the grain structure.

AB - Prior austenite grain (PAG) structure is an important factor influencing hydrogen embrittlement (HE) susceptibility of ultrahigh-strength steels. In this study, the effect of PAG shape and size on HE behaviour is investigated using a novel tuning-fork testing method and hydrogen thermal desorption spectroscopy (TDS). Different PAG structures were acquired via re-austenitization (860 °C = A860, 960 °C = A960) and rapid quenching of an as-received 500 HBW direct-quenched (DQ) steel, which has an auto-tempered lath-martensitic microstructure and elongated PAG morphology. Fractography reveals different crack propagation mechanisms depending on the PAG shape. With the elongated PAG structure, hydrogen-induced crack propagation transverse to elongated PAGs was transgranular quasi-cleavage. Propagation was partially intergranular with the equiaxed PAG structures, regardless of the PAG size, leading to equally faster fracture. The TDS results show that there are no significant differences between the total hydrogen contents, but re-austenitized A860 and A960 steels contain a higher fraction of weakly trapped hydrogen. This indicates that the PAG boundaries are not the dominant hydrogen traps, and the different crack propagation mechanisms are rather linked to the geometrical shape of the grain structure.

KW - hydrogen embrittlement

KW - prior austenite grain structure

KW - steel

KW - TDS

KW - tuning-fork test

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U2 - 10.1016/j.prostr.2022.12.110

DO - 10.1016/j.prostr.2022.12.110

M3 - Conference article in proceedings

AN - SCOPUS:85158944270

T3 - Procedia Structural Integrity

SP - 871

EP - 878

BT - 23rd European Conference on Fracture, ECF 2022

A2 - Moreira, Pedro

A2 - Reis, Luis

PB - Elsevier

T2 - European Conference on Fracture

Y2 - 27 June 2022 through 1 July 2022

ER -

Latypova R, Nyo TT, Seppälä O, Fangnon E, Yagodzinskyy Y, Mehtonen S et al. Effect of prior austenite grain morphology on hydrogen embrittlement behaviour under plastic straining in as-quenched 500 HBW steels. In Moreira P, Reis L, editors, 23rd European Conference on Fracture, ECF 2022. Elsevier. 2022. p. 871-878. (Procedia Structural Integrity). doi: 10.1016/j.prostr.2022.12.110

Effect of prior austenite grain morphology on hydrogen embrittlement behaviour under plastic straining in as-quenched 500 HBW steels

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