Investigation on Fracture Behavior of Grade 91 Steel at 300-550 °C
Journal Article
·
· Journal of Materials Engineering and Performance
- Indira Gandhi Centre for Atomic Research, Metallurgy and Materials Group (India)
The fracture toughness (J{sub 1c}) of modified 9Cr-1Mo (P91 or Grade 91) steel was evaluated in the temperature range 300-550 °C. The yield strength and ultimate tensile strength values were observed to decrease with test temperatures. The ductility (% uniform elongation and post-necking elongation) was minimum in the temperature range 350-400 °C. From J–R curves established at 300, 350, 400, 450, 500, and 550 °C, fracture toughness (J{sub 1c}) and tearing modulus were determined at different loading rates of 0.01, 0.05 and 0.1 mm/s. For all the loading rates, J{sub 1c} values decreased in the temperature range 300-450 °C, followed by an increase in fracture toughness up to 550 °C. These trends in tensile and fracture properties can be attributed to the influence of dynamic strain aging.
- OSTI ID:
- 22971091
- Journal Information:
- Journal of Materials Engineering and Performance, Journal Name: Journal of Materials Engineering and Performance Journal Issue: 12 Vol. 27; ISSN 1059-9495; ISSN JMEPEG
- Country of Publication:
- United States
- Language:
- English
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