Mechanical Properties of P91 Steel (X10CrMoVNb9-1) during Simulated Operation in a Hydrogen-Containing Environment

• Published in: Materials Vol. 17; no. 17; p. 4398
• Main Authors: Junak, Grzegorz, Adamiec, Janusz, Łyczkowska, Katarzyna
• Format: Journal Article
• Language: English
• Published: Switzerland MDPI AG 06.09.2024
• Subjects: Adsorption; Chromium molybdenum steels; Corrosion fatigue; Corrosion resistance; Corrosion tests; Crack initiation; Crack propagation; Creep strength; Damage assessment; Ductility; Ductility tests; Elongation; Energy industry; Fatigue failure; Ferritic stainless steels; Hydrogen; Impact resistance; Impact strength; Load; Mechanical properties; Metal fatigue; Precipitation hardening; Propagation; Steel; Temperature; Tensile strength; Thermal fatigue; Thermal resistance; Yield stress; hydrogen induced cracking; hydrogen permeation; P91 steel (X10CrMoVNb9-1/9Cr-1Mo-V); hydrogen embrittlement
• ISSN: 1996-1944; 1996-1944
• DOI: 10.3390/ma17174398

P91 steel (X10CrMoVNb9-1) is widely used in the energy industry. It is characterized by good mechanical properties, creep resistance, corrosion resistance, impact toughness, and resistance to thermal fatigue. Due to their operating conditions and martensitic structure, components made from P91 steel are often subject to damage related to the presence of hydrogen. This article compares the results of the mechanical properties evaluation for P91 steel in an aggressive solution charged under load and without load. Based on the research, it was found that the hydrogen environment significantly affects the mechanical properties of P91 steel, reducing strength and yield strength, and decreasing ductility. It was revealed that in samples tested after 72 h without preloading, the tensile strength decreased by 1.5%, and the elongation decreased by about 29% for the sample, compared to the delivered condition sample. Under loaded conditions, the difference in tensile strength increased by approximately 8%, while elongation increased by nearly 50%