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Open AccessArticle

Alloy Optimization for Reducing Delayed Fracture Sensitivity of 2000 MPa Press Hardening Steel

1
NiobelCon BV, B-2970 Schilde, Belgium
2
Department of Materials Engineering (MTM), KU Leuven, B-3001 Heverlee, Belgium
3
Department of Mechanical and Systems Engineering, Okayama University, Okayama 700-8530, Japan
*
Author to whom correspondence should be addressed.
Metals 2020, 10(7), 853; https://doi.org/10.3390/met10070853
Received: 8 June 2020 / Revised: 23 June 2020 / Accepted: 26 June 2020 / Published: 28 June 2020
Press hardening steel (PHS) is widely applied in current automotive body design. The trend of using PHS grades with strengths above 1500 MPa raises concerns about sensitivity to hydrogen embrittlement. This study investigates the hydrogen delayed fracture sensitivity of steel alloy 32MnB5 with a 2000 MPa tensile strength and that of several alloy variants involving molybdenum and niobium. It is shown that the delayed cracking resistance can be largely enhanced by using a combination of these alloying elements. The observed improvement appears to mainly originate from the obstruction of hydrogen-induced damage incubation mechanisms by the solutes as well as the precipitates of these alloying elements. View Full-Text
Keywords: hydrogen damage mechanisms; austenite grain size; precipitation; grain boundary cohesion; vacancy complexes; solute segregation hydrogen damage mechanisms; austenite grain size; precipitation; grain boundary cohesion; vacancy complexes; solute segregation
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Mohrbacher, H.; Senuma, T. Alloy Optimization for Reducing Delayed Fracture Sensitivity of 2000 MPa Press Hardening Steel. Metals 2020, 10, 853.

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