Hot Ductility of Cast High Nitrogen Fe-Cr-Mn-Ni Steel

Byung Ju Lee; Sun Ig Hong

doi:10.4028/www.scientific.net/KEM.765.178

Paper Titles

Corrosion of 310S Austenitic Stainless Steel in Simulated Rocket Combustion Gas
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Micromechanical Study of the Forged Ti-1023 Titanium Alloy by Micro-Indentation
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Stress-Strain Responses of Multi-Phase CoCrCuMnNi and CoCrMnFeCu Alloys
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Corrosion of Fe₃Al-4Cr Alloys at 1000°C in N₂-0.1%H₂S Gas
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Hot Ductility of Cast High Nitrogen Fe-Cr-Mn-Ni Steel
p.178

Effect of Tantalum (Ta) Addition to Zinc-Aluminum Alloy 5 (ZA5) on its Microstructure and Fatigue Life
p.184

CVD Technology for Preparing Chromium Oxide Coatings, Study of the Kinetics of Growth of Coatings
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Visualization of Contact-Pressure Distribution between Material and Backing Plate in Friction Stir Processing
p.199

Influence of Process Parameters of 316LN Hot Wire Filling Laser Welding on the Blunt Edge Layer Forming Quality
p.204

HomeKey Engineering MaterialsKey Engineering Materials Vol. 765Hot Ductility of Cast High Nitrogen Fe-Cr-Mn-Ni...

Hot Ductility of Cast High Nitrogen Fe-Cr-Mn-Ni Steel

Abstract:

Hot deformability and fracture of as-cast Fe-Cr-Mn-Ni stainless steel ingots with high nitrogen and high carbon contents were studied. Effective stress-strain curve indicates a decrease of the UTS from 510MPa to 90MPa with increase of temperatures from 600°C to 1200°C. Effective stress-strain curves exhibited typical work hardening until the final stage of fracture from 600°C up to 900°C. The fracture elongation decreased from 600°C with the increase of temperature up 850°C, but started to increase appreciably as the work softening becomes dominant in the stress-strain curves above 950°C, suggesting the increase of ductility above 950°C is associated with dynamic recrystallization. The high temperature deformability was enhanced above 1000°C by homogenization of the as-cast alloy due to the dissolution and redistribution of segregated particles, providing the homogeneous distribution of the nucleation site of dynamic recrystallization. . The presence of fatal crack at 1,250°C and the loss of hot ductility can be attributed to the partial melting in austenite grain boundaries at high temperatures.