Brittle-to-ductile Transition in Nickel-free Austenitic Stainless Steels with High Nitrogen

Tanaka, Masaki; Onomoto, Tatsuro; Tsuchiyama, Toshihiro; Higashida, Kenji

doi:10.2355/isijinternational.52.915

Cited by 14 publications

(4 citation statements)

References 29 publications

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“…The steel demonstrates striking temperature dependence of the yield strength (Figure 4a) peculiar for fcc alloys with high volume content of interstitials [8,14,20,44,45]. The σ 0.2 -values in Figure 4a show almost linear growth with the decrease in test temperature.…”

Section: Discussionmentioning

confidence: 95%

On Temperature Dependence of Microstructure, Deformation Mechanisms and Tensile Properties in Austenitic Cr-Mn Steel with Ultrahigh Interstitial Content C + N = 1.9 Mass.%

Астафурова

Астафуров

Maier

et al. 2020

Metals

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The microstructure, deformation mechanisms, tensile properties and fracture micromechanisms of ultrahigh-interstitial austenitic Fe-22Cr-26Mn-1.3V-0.7C-1.2N (mass.%) steel were investigated in wide temperature interval. After conventional homogenization and solid-solution treatment, the steel possesses complex hardening which includes grain boundary, solid-solution and dispersion strengthening. In the temperature interval of −60 to +60 °C, steel demonstrates striking temperature dependence of a yield strength which could be enhanced by the increase in solid-solution treatment temperature. The variation in test temperature does not change the dominating deformation mechanism of the steel, dislocation slip and insufficiently influences tensile elongation and fracture micromechanisms. The insignificant increase in the fraction of brittle cleavage-like component on the fracture surfaces of the specimens in low-temperature deformation regime is promoted by increase in planarity of dislocation arrangement and the gaining activity of mechanical twinning. In high-temperature range (200–300 °C) of deformation, a negative strain-rate dependence, serrations on the stress-strain diagrams and improved strain-hardening associated with a dynamic strain aging phenomenon have been observed.

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Section: Discussionmentioning

confidence: 95%

On Temperature Dependence of Microstructure, Deformation Mechanisms and Tensile Properties in Austenitic Cr-Mn Steel with Ultrahigh Interstitial Content C + N = 1.9 Mass.%

Астафурова

Астафуров

Maier

et al. 2020

Metals

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“…Since dislocation glide is thermally activated, therefore at low temperatures accommodating slip activity is low, leading to a lower stress needed to propagate the twin. 12,13) The decreased temperature will also support the piling up of dislocations in front of the twin boundary. 14) In conclusion, it indicates that deformation twinning could possibly play a significant role in the BDT of 400-18L ductile iron.…”

Section: Resultsmentioning

confidence: 99%

Fracture Mechanism of Ferritic Ductile Iron under Instrumented Impact Load at Low Temperatures

Xinning

2014

ISIJ Int.

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The impact toughness of 400-18L ductile iron (FCD400-18L) was measured by V-notch Charpy impact test at room and low temperatures. SEM and TEM were used to analyze the fracture mechanism. Experimental results show that the energy absorbed by impact test decreases significantly with the decrease of temperature. The fracture properties were measured using instrumented impact testing at temperatures between -80 and 20°C. The total impact fracture energy, the crack initiation and propagation energy, the dynamic loads and the ductile to brittle temperature were measured. The 400-18L ductile iron exhibited much higher resistance to ductile fracture at high test temperatures, while its resistance to brittle fracture at low test temperatures was reduced. The fracture morphology analysis was discussed in terms of the two fracture types: ductile fracture mechanism upon the BDTT (brittle to ductile transition temperature) and brittle fracture mechanism below the BDTT.

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“…14) When dislocations cannot move fast enough to accommodate the stress intensity around the crack tip, austenitic steels should be brittle as that seen in ferritic steels. The concept that dislocation glide controls the BDT suggests that the BDT temperature in austenitic steels should also be influenced by the change in the dislocation mobility.…”

Section: Introductionmentioning

confidence: 99%

Decrease in the Brittle-to-ductile Transition Temperature in Cu Added Nickel-free Austenitic Stainless Steels

et al. 2014

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Brittle-to-ductile transition (BDT) in Cu added Ni-free austenitic stainless steel was investigated. Temperature dependence of apparent fracture toughness was measured using four-point bending tests, indicating that the BDT temperature was decreased with the increase in the Cu content. The activation energy was obtained from the deformation rate dependence of BDT temperatures. It was found that the values of the activation energy was decreased with the increase in the Cu content, suggesting that the dislocation mobility in austenitic stainless steels was increased by Cu addition. The increase in the dislocation mobility induces the decrease in the BDT temperature. The values of the activation energy are deviated from the regression line drawn on the data which obtained from the materials with high Peierls potentials. Temperature dependence of 0.2% proof stress indicated that the effective stress was nearly independent from the Cu content while the values of activation volume were decreased with the increase in the Cu content. A model for dislocation glide was proposed to explain the both decrease in the activation energy and the activation volume with the increase in the Cu content.

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Brittle-to-ductile Transition in Nickel-free Austenitic Stainless Steels with High Nitrogen

Cited by 14 publications

References 29 publications

On Temperature Dependence of Microstructure, Deformation Mechanisms and Tensile Properties in Austenitic Cr-Mn Steel with Ultrahigh Interstitial Content C + N = 1.9 Mass.%

On Temperature Dependence of Microstructure, Deformation Mechanisms and Tensile Properties in Austenitic Cr-Mn Steel with Ultrahigh Interstitial Content C + N = 1.9 Mass.%

Fracture Mechanism of Ferritic Ductile Iron under Instrumented Impact Load at Low Temperatures

Decrease in the Brittle-to-ductile Transition Temperature in Cu Added Nickel-free Austenitic Stainless Steels

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