Impact toughness of a 10% Cr steel with high boron and low nitrogen contents

The effect of temperature on the impact toughness and fracture behavior of a 10% Cr-2% W-0.7% Mo-3% Co-0.05% Nb-0.2% V-0.008% B-0.003% N (all in wt%) steel was studied. The ductile-brittle transition (DBT) occurs at 10 °C. At the DBT temperature (DBTT), the onset of unstable crack propagation occurs...

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Bibliographic Details
Published in:Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 2018-07, Vol.730, p.1-9
Main Authors: Mishnev, R., Dudova, N., Dudko, V., Kaibyshev, R.
Format: Article
Language:English
Subjects:
Boron steels
Boundaries
Brittle-to-ductile transition
Brittleness
Carbides
Charpy impact test
Chromium steels
Cold rolling
Crack propagation
Ductile-brittle transition
Ductility
Embrittlement
Fractography
Fracture
Fracture mechanics
Fracture toughness
Impact strength
Martensitic steel
Molybdenum
Niobium
Nitrogen
Steel
Stress propagation
Temperature effects
Tungsten
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Summary:The effect of temperature on the impact toughness and fracture behavior of a 10% Cr-2% W-0.7% Mo-3% Co-0.05% Nb-0.2% V-0.008% B-0.003% N (all in wt%) steel was studied. The ductile-brittle transition (DBT) occurs at 10 °C. At the DBT temperature (DBTT), the onset of unstable crack propagation occurs at the maximum load. The embrittlement is attributed to the onset of unstable crack propagation at stresses below the general yielding. A decrease in nitrogen content and an increase in boron content lead to the formation of chains of closely spaced M23C6 carbides at lath boundaries. The formation of numerous voids at carbide-matrix boundaries results in the appearance of crack with critical dimension after stable crack propagation over a very short distance. As a result, the energy of the stable crack propagation is low and the embrittlement takes place at relatively high temperature.
ISSN:0921-5093
1873-4936
DOI:10.1016/j.msea.2018.05.103