Effect of short-term aging on the impact toughness of advanced 10% Cr steel
Abstract
The effect of short-term aging (100 h) at 650°C on the temperature dependence of impact toughness and fracture behavior of advanced 10% Cr steel with low N and high B contents was studied. The steel in tempered condition exhibits the ductile-brittle transition temperature (DBTT) of ∼10°C and the Charpy V-notch impact energy of 240 J/cm2 at a temperature of 20°C. Aging for 100 h at 650°C leads to the increase in the DBTT to 35°C and decrease in the impact toughness at 20°C to 90 J/cm2. Effect of the fine (up to 100 nm) Laves phase particles precipitated at lath/grain boundaries on the impact toughness is analyzed. The Laves phase particles serve as additional nucleation sites for microcracks/voids facilitating unstable crack propagation. This is the main reason for decreasing the stable crack propagation energy and impact toughness of the steel.
- Publication:
-
Advanced Materials with Hierarchical Structure for New Technologies and Reliable Structures 2019
- Pub Date:
- November 2019
- DOI:
- 10.1063/1.5132098
- Bibcode:
- 2019AIPC.2167b0231M