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Through-thickness cleavage fracture stress of a Ti-V-N plate steel
Through-thickness cleavage fracture stresses, sigmaf*, have been determined for six microstructures of a Ti-V-N plate steel directly by through-thickness four-point bending (4PB) notched specimens. Results showed that sigmaf* is higher for ferrite-bainite microstructures than for ferrite-banded pearlite. For an identical finish-rolling temperature (FRT), the plates with a high cooling rate have a higher value of sigmaf* than their counterparts with a low cooling rate. Following the same cooling rate, the highest values of sigmaf* are obtained for steels finish rolled above Ar3 but below TNR (nonrecrystallization) and the lowest for steels finish rolled below Ar3, which contain deformed ferrite (DF) with texture components. Cleavage microcracks are observed to initiate at second-phase particle or pearlite-ferrite interface and then to propagate into ferrite matrix. Growing microcracks could be arrested by bainite phase distributed uniformly in ferrite matrix, which contributes to a high value of sigmaf*. The low value of sigma f* was attributed to elongated ferrite-deformed ferrite and martensite/austenite (MA) microstructures.
Through-thickness cleavage fracture stress of a Ti-V-N plate steel
Through-thickness cleavage fracture stresses, sigmaf*, have been determined for six microstructures of a Ti-V-N plate steel directly by through-thickness four-point bending (4PB) notched specimens. Results showed that sigmaf* is higher for ferrite-bainite microstructures than for ferrite-banded pearlite. For an identical finish-rolling temperature (FRT), the plates with a high cooling rate have a higher value of sigmaf* than their counterparts with a low cooling rate. Following the same cooling rate, the highest values of sigmaf* are obtained for steels finish rolled above Ar3 but below TNR (nonrecrystallization) and the lowest for steels finish rolled below Ar3, which contain deformed ferrite (DF) with texture components. Cleavage microcracks are observed to initiate at second-phase particle or pearlite-ferrite interface and then to propagate into ferrite matrix. Growing microcracks could be arrested by bainite phase distributed uniformly in ferrite matrix, which contributes to a high value of sigmaf*. The low value of sigma f* was attributed to elongated ferrite-deformed ferrite and martensite/austenite (MA) microstructures.
Through-thickness cleavage fracture stress of a Ti-V-N plate steel
Sun, J. (author) / Boyd, J.D. (author)
Journal of Materials Engineering and Performance ; 10 ; 337-343
2001
7 Seiten, 24 Quellen
Article (Journal)
English
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