Design of high-strength martensitic steels by novel mixed-metal nanoprecipitates for high toughness and suppressed hydrogen embrittlement

Masoud Moshtaghi, Emad Maawad, Artenis Bendo, Andreas Krause, Juraj Todt, Jozef Keckes, Mahdieh Safyari

Publikation: Beitrag in FachzeitschriftArtikelForschungBegutachtung

Abstract

To obtain a fundamental understanding of mechanisms of hydrogen embrittlement (HE) and its prevention in advanced high-strength steels containing novel nanoscale mixed-metal precipitates, it is necessary to study local microstructure, H trapping, and crack path with new multiscale experimental and simulation approach. Spatially resolved hydrogen mapping via SKPFM is used together with investigation of the crack path using high-resolution EBSD and HMPT, and global trapping behavior of the alloys by TDS. These results are combined with newly introduced method to elucidate real-time distribution of hydrogen in the alloy using high-energy synchrotron X-ray diffraction (HES-XRD). Mixed-metal precipitates improves HE resistance of the alloy, due to nature of the trapping sites, e.g. irreversible H-trapping by carbon vacancies inside novel nanoprecipitates and high total length of PAGBs. This is because of lower possibility of build-up of critical local hydrogen content at PAGBs for intergranular hydrogen-assisted cracking due to hydrogen-enhanced decohesion mechanism. Less weakly trapped hydrogen also reduces frequency of dislocation activation and enhanced dislocation slip in {0 1 1} slip plane due to hydrogen-enhanced localized plasticity in regions with affinity for transgranular hydrogen-assisted cracking at lower local hydrogen content. Direct evidence of carbon vacancies in novel nanoprecipitates is observed for the first time via HAADF-STEM.
OriginalspracheEnglisch
Aufsatznummer112323
Seitenumfang15
FachzeitschriftMaterials & design
Jahrgang234.2023
AusgabenummerOctober
DOIs
PublikationsstatusElektronische Veröffentlichung vor Drucklegung. - 14 Sept. 2023

Bibliographische Notiz

Funding Information:
The authors would like to acknowledge the financial contribution of Kamei Corporation, Japan, and the Ministry of Education, Culture, Sports, Science and Technology, Japan (MEXT- Monbu Kagakushu). The authors appreciate the helpful discussion and resources provided by F. Abbasi. We acknowledge DESY (Hamburg, Germany), a member of the Helmholtz Association HGF, for the provision of experimental facilities. Parts of this research were carried out at PETRA III and we would like to thank Dr. Norbert Schell for assistance in using beamline P07b.

Funding Information:
The authors would like to acknowledge the financial contribution of Kamei Corporation, Japan, and the Ministry of Education, Culture, Sports, Science and Technology, Japan (MEXT- Monbu Kagakushu). The authors appreciate the helpful discussion and resources provided by F. Abbasi. We acknowledge DESY (Hamburg, Germany), a member of the Helmholtz Association HGF, for the provision of experimental facilities. Parts of this research were carried out at PETRA III and we would like to thank Dr. Norbert Schell for assistance in using beamline P07b.

Publisher Copyright:
© 2023 The Authors

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