Influence of nitrogen on the notch toughness of heat-treated 0.3-percent-carbon steels at low temperatures

Geil, G.W.; Carwile, N.L.; Digges, T.G.

doi:10.6028/jres.048.027

Cited by 6 publications

(1 citation statement)

References 5 publications

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“…Of the interstitials, the segregation of O and N to grain boundaries is considered to have the most detrimental effect. In carbon steels, early studies showed that impact toughness was increased by lowering the O and N levels or removing these elements from the bcc Fe lattice by precipitating oxide and nitrides (as well as carbides) [38]. Hondros and Stuart determined from grain boundary energies that no significant adsorption of O occurs in Fe-3%Si steel [39].…”

Section: High-temperature Fracture Toughness Propertiesmentioning

confidence: 99%

Influence of processing on the microstructure and mechanical properties of 14YWT

Hoelzer

Unocic

Sokolov

et al. 2016

Journal of Nuclear Materials

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The investigation of the mechanical alloying (MA) conditions for producing the advanced oxide dispersion strengthened (ODS) 14YWT ferritic alloy led to significant improvements in balancing the strength, ductility and fracture toughness properties while still maintaining the salient microstructural features consisting of ultra-fine grains and high concentration of Y-, Tiand O-enriched nanoclusters. The implemented changes to the processing conditions included reducing the contamination of the powder during ball milling, applying a pre-extrusion annealing treatment on the ball milled powder and exploring different extrusion temperatures at 850ºC (SM170 heat), 1000ºC (SM185) and 1150ºC (SM200). The microstructural studies of the three 14YWT heats showed similarities in the dispersion of nanoclusters and sub-micron size grains, indicating the microstructure was insensitive to the different extrusion conditions. Compared to past 14YWT heats, the three new heats showed lower strength, but higher ductility levels between 25 and 800ºC and significantly higher fracture toughness values between 25ºC and 700ºC. The lower contamination levels of O, C and N achieved with improved ball milling conditions plus the slightly larger grain size were identified as important factors for improving the balance in mechanical properties of the three heats of 14YWT.

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Section: High-temperature Fracture Toughness Propertiesmentioning

confidence: 99%