Theses and Dissertations
Issuing Body
Mississippi State University
Advisor
Rhee, Hongjoo
Committee Member
Doude, Haley R.
Committee Member
Limmer, Krista
Date of Degree
5-3-2022
Document Type
Graduate Thesis - Open Access
Major
Mechanical Engineering
Degree Name
Master of Science (M.S.)
College
James Worth Bagley College of Engineering
Department
Department of Mechanical Engineering
Abstract
High hardness steels can be affected by delayed brittle cracking often attributed to hydrogen embrittlement. Improved resistance to hydrogen embrittlement would be beneficial to many industries including military, automotive, and high-rise construction. While other prevention methods include coating, trapping, and barriers, design efforts in this study were focused on improving intrinsic properties to be more resistant to hydrogen embrittlement. Four alloys targeting 477 – 534 HB were designed and produced in-house and compared against a commercial grade 500 HB alloy. Charpy V-notch (CVN) impact toughness and tensile specimens were made according to ASTM E23 and ASTM E8 to characterize mechanical properties. Hydrogen embrittlement testing was performed using ASTM E8 test samples electro-chemically charged in either sodium hydroxide or sulfuric acid with thiourea in solution. Results suggested that alloying for lower strength and better toughness by reducing C and Mn results in lower hydrogen embrittlement susceptibility.
Recommended Citation
Salley, David Ahlen, "Characterization of hydrogen embrittlement sensitivity in high hardness steels" (2022). Theses and Dissertations. 5484.
https://scholarsjunction.msstate.edu/td/5484
Included in
Metallurgy Commons, Other Materials Science and Engineering Commons, Structural Materials Commons