Alloy optimization for reducing delayed fracture sensitivity of 2000 mpa press hardening steel

Hardy Mohrbacher; Takehide Senuma

doi:10.3390/met10070853

Alloy optimization for reducing delayed fracture sensitivity of 2000 mpa press hardening steel

Hardy Mohrbacher, Takehide Senuma

Faculty of Engineering

Research output: Contribution to journal › Article › peer-review

14 Citations (Scopus)

Abstract

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.

Original language	English
Article number	853
Pages (from-to)	1-19
Number of pages	19
Journal	Metals
Volume	10
Issue number	7
DOIs	https://doi.org/10.3390/met10070853
Publication status	Published - Jul 2020

Keywords

Austenite grain size
Grain boundary cohesion
Hydrogen damage mechanisms
Precipitation
Solute segregation
Vacancy complexes

ASJC Scopus subject areas

Materials Science(all)

Access to Document

10.3390/met10070853

Cite this

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title = "Alloy optimization for reducing delayed fracture sensitivity of 2000 mpa press hardening steel",

abstract = "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.",

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AU - Mohrbacher, Hardy

AU - Senuma, Takehide

N1 - Funding Information: Funding: This research was funded by the International Molybdenum Association (IMOA), London, UK. Publisher Copyright: © 2020 by the authors. Licensee MDPI, Basel, Switzerland.

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N2 - 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.

AB - 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.

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KW - Solute segregation

KW - Vacancy complexes

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Alloy optimization for reducing delayed fracture sensitivity of 2000 mpa press hardening steel

Abstract

Keywords

ASJC Scopus subject areas

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