Contribution of grain boundary fracture into variation of the critical brittle point of steel 15Kh2NMFA and its welds

• Published in: Metal science and heat treatment Vol. 53; no. 7-8; pp. 379 - 386
• Main Authors: Chernobaeva, A. A., Nikolaev, Yu. A., Nikulin, S. A., Turilina, V. Yu, Skorodumov, S. V., Salikhov, T. Sh, Li, E. V., Arsenkin, A. M.
• Format: Journal Article
• Language: English
• Published: Boston Springer US 01.10.2011; Springer; Springer Nature B.V
• Subjects: Brittle fracture; Characterization and Evaluation of Materials; Chemistry and Materials Science; Classical Mechanics; Engineering Thermodynamics; Fracture mechanics; Fracture. Brittleness; Grain boundaries; Heat and Mass Transfer; Impact tests; Materials Science; Metallic Materials; Nuclear power plants; Segregations; Steels; Temper brittleness; Toy industry; Welded joints; grain boundary segregations; nuclear power plant; reversible temper brittleness; intergrain fracture; reactor vessel
• ISSN: 0026-0673; 1573-8973
• DOI: 10.1007/s11041-011-9402-2

Fracture surfaces of Charpy test pieces are studied and the proportion of grain boundary fracture is determined for 15 groups of pieces of steel 15Kh2NMFAin the state as delivered and after special embrittling treatment in the temperature range of the development of reversible temper brittleness. Welds of steel 15Kh2NMFA are studied for determining the causes of changes in the fracture energy upon formation of segregations over grain boundaries. It is shown what parameters should be allowed for in evaluation of the contribution of grain boundary fracture into the change in the critical brittle point.