Corrosion Cracking of Steels of Various Strengths at a Constant Crack Opening

• Published in: Russian metallurgy Metally Vol. 2019; no. 4; pp. 453 - 457
• Main Authors: Grinevich, A. V., Yakovlev, N. O., Skripachev, S. Yu, Nuzhnyi, G. A.
• Format: Journal Article
• Language: English
• Published: Moscow Pleiades Publishing 01-04-2019; Springer Nature B.V
• Subjects: Anodic dissolution; Chemistry and Materials Science; Corrosion; Corrosion resistance; Corrosion resistant steels; Crack tips; Diagnostics and Mechanical Test Techniques; Dissolution; Edge cracks; Fracture mechanics; Fracture toughness; Hydrogen embrittlement; Martensitic stainless steels; Materials Science; Metallic Materials; Reaction kinetics; Stress corrosion cracking; crack opening; fracture toughness; stress intensity factor; compact specimen; full-scale tests
• ISSN: 0036-0295; 1555-6255; 1531-8648
• DOI: 10.1134/S0036029519040141

Earlier, we proposed a technique to estimate the fracture toughness of a metallic material. It differs from standard techniques in the determination of the operating stresses in an improved compact specimen with an edge crack. Using this technique, we determine the corrosion damage resistance of martensitic 30KhGSA (σ
u
≈ 1080 MPa) and VKS-9n (σ
u
≈ 2010 MPa) steels under full-scale and laboratory conditions and analyze their corrosion fracture kinetics. The corrosion fractures of the steels with different strength levels are found to have different characters: the 30KhGSA steel is likely to undergo anodic dissolution at the crack tip, and the high-strength VKS-9 steel undergoes hydrogen embrittlement.