Abstract

In this study, the ideal alloying element (among Cr, V, and Mo carbides) to enhance the resistance to hydrogen embrittlement (HE) in a tempered martensitic steel was investigated. Four types of steels were designed to contain cementites, Cr-rich M7C3 carbides, V carbides, and Mo carbides, respectively. These steels were tailored to possess a comparable tensile strength (~1.6 GPa). The HE resistances of these steels were evaluated through the slow strain rate test and cyclic corrosion test. The results showed an enhanced HE resistance, characterized by a high notch fracture strength after hydrogen charging, in the samples containing V carbides and Mo carbides. In particular, Mo carbide was regarded as the most ideal alloying element for HE resistance because of the high resistivity parameter, inhibited hydrogen penetration, and suppressed strength loss by internal hydrogen.

Details

Title
Comparative study on the effects of Cr, V, and Mo carbides for hydrogen-embrittlement resistance of tempered martensitic steel
Author
Lee, Junmo 1 ; Lee, Taekyung 2   VIAFID ORCID Logo  ; Dong-Jun, Mun 1 ; Bae, Chul Min 1 ; Lee, Chong Soo 3   VIAFID ORCID Logo 

1  Pohang Research Lab, POSCO, Pohang, Korea (GRID:grid.480377.f) (ISNI:0000 0000 9113 9200) 
2  Pusan National University, School of Mechanical Engineering, Busan, Korea (GRID:grid.262229.f) (ISNI:0000 0001 0719 8572) 
3  Pohang University of Science and Technology (POSTECH), Graduate Institute of Ferrous Technology, Pohang, Korea (GRID:grid.49100.3c) (ISNI:0000 0001 0742 4007) 
Publication year
2019
Publication date
Dec 2019
Publisher
Nature Publishing Group
e-ISSN
20452322
Source type
Scholarly Journal
Language of publication
English
DOI
https://doi.org/10.1038/s41598-019-41436-2
ProQuest document ID
2197873799
Copyright
This work is published under http://creativecommons.org/licenses/by/4.0/ (the “License”). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.