Influence of Sizes of Inclusions and Voids on Fracture Toughness of Ultra-High Strength Steel AerMet100

• Published in: Journal of iron and steel research, international Vol. 14; no. 5; pp. 254 - 258
• Main Authors: LI, Jie, GUO, Feng, LI, Zhi, WANG, Jun-li, YAN, Ming-gao
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.09.2007
• Subjects: AerMet100 steel; fracture toughness; inclusion; voids; inclusion; fracture toughness; AerMet100 steel; voids
• ISSN: 1006-706X; 2210-3988
• DOI: 10.1016/S1006-706X(08)60089-8

Mechanical properties of the ultra-high strength steel AerMet100 aged at 454°C∼510°C were studied, and relationship between the critical crack tip opening displacement δ IC and X 0 ( R V / R I )| R0 was calculated, where X 0 was an average inclusion spacing and ( R V / R I )| R0 was the void radius R V divided by the radius of the inclusion R I nucleating the void evaluated at the average inclusion size R 0. The results showed that high fracture toughness could be reached after aging at 510 °C, and aging temperature affected fracture toughness apparently. δ IC was in linear relationship with X 0 ( R V / R I )| R0 in the range of 8μm∼50μm. R 0 was 0.53μm, X 0 was 6.39μm for the tested steel, and the values of ( R V / R I )| R0 were different for varied microstructures. The fracture toughness of AerMet100 steel was influenced by microstructures and inclusions greater than that of AF1410 steel.