Structural transformations in high-nitrogen austenitic steel

1988 ◽  
Vol 31 (6) ◽  
pp. 451-454
Author(s):  
V. N. Timofeev ◽  
V. F. Sukhovarov ◽  
V. M. Blinov ◽  
I. L. Poimenov
Keyword(s):  
Austenitic Steel ◽  
Structural Transformations ◽  
High Nitrogen

Structure, Phase Composition, and Mechanical Properties of a Boron-Containing High-Nitrogen Austenitic Steel Made by Induction Melting

2020 ◽  
Vol 2020 (12) ◽  
pp. 1439-1445
Author(s):  
I. O. Bannykh ◽  
O. A. Bannykh ◽  
L. G. Rigina ◽  
E. N. Blinova ◽  
K. Yu. Demin ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Phase Composition ◽  
Austenitic Steel ◽  
Induction Melting ◽  
High Nitrogen ◽  
Structure Phase

scholarly journals Structural Transformations and Mechanical Properties of Metastable Austenitic Steel under High Temperature Thermomechanical Treatment

Metals ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 645
Author(s):  
Igor Litovchenko ◽  
Sergey Akkuzin ◽  
Nadezhda Polekhina ◽  
Kseniya Almaeva ◽  
Evgeny Moskvichev
Keyword(s):  
Plastic Deformation ◽  
Grain Size ◽  
High Temperature ◽  
Austenitic Steel ◽  
Structural Transformations ◽  
Initial State ◽  
Twin Boundaries ◽  
Metastable Austenitic Steel ◽  
Average Grain Size ◽  
Heating Up

The effect of high-temperature thermomechanical treatment on the structural transformations and mechanical properties of metastable austenitic steel of the AISI 321 type is investigated. The features of the grain and defect microstructure of steel were studied by scanning electron microscopy with electron back-scatter diffraction (SEM EBSD) and transmission electron microscopy (TEM). It is shown that in the initial state after solution treatment the average grain size is 18 μm. A high (≈50%) fraction of twin boundaries (annealing twins) was found. In the course of hot (with heating up to 1100 °C) plastic deformation by rolling to moderate strain (e = 1.6, where e is true strain) the grain structure undergoes fragmentation, which gives rise to grain refining (the average grain size is 8 μm). Partial recovery and recrystallization also occur. The fraction of low-angle misorientation boundaries increases up to ≈46%, and that of twin boundaries decreases to ≈25%, compared to the initial state. The yield strength after this treatment reaches up to 477 MPa with elongation-to-failure of 26%. The combination of plastic deformation with heating up to 1100 °C (e = 0.8) and subsequent deformation with heating up to 600 °C (e = 0.7) reduces the average grain size to 1.4 μm and forms submicrocrystalline fragments. The fraction of low-angle misorientation boundaries is ≈60%, and that of twin boundaries is ≈3%. The structural states formed after this treatment provide an increase in the strength properties of steel (yield strength reaches up to 677 MPa) with ductility values of 12%. The mechanisms of plastic deformation and strengthening of metastable austenitic steel under the above high-temperature thermomechanical treatments are discussed.

Effect of hydrogenation on mechanical properties and tensile fracture mechanism of a high-nitrogen austenitic steel

2016 ◽  
Vol 52 (8) ◽  
pp. 4224-4233 ◽  
Author(s):  
Elena G. Astafurova ◽  
Valentina A. Moskvina ◽  
Galina G. Maier ◽  
Eugene V. Melnikov ◽  
Gennady N. Zakharov ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Austenitic Steel ◽  
Fracture Mechanism ◽  
Tensile Fracture ◽  
High Nitrogen

Resistance of a high nitrogen austenitic steel to cavitation erosion

Wear ◽  
2001 ◽  
Vol 249 (9) ◽  
pp. 788-791 ◽  
Author(s):  
Fu Wantang ◽  
Zheng Yangzeng ◽  
He Xiaokui
Keyword(s):  
Austenitic Steel ◽  
Cavitation Erosion ◽  
High Nitrogen

Anelastic Phenomena and Cr2N Precipitation in a High Nitrogen Austenitic Steel

2010 ◽  
Vol 89-91 ◽  
pp. 485-490
Author(s):  
Paolo Deodati ◽  
Roberto Montanari ◽  
Ludovica Rovatti ◽  
Nadia Ucciardello ◽  
Andrea Carosi
Keyword(s):  
Austenitic Steel ◽  
Dynamic Modulus ◽  
Room Temperature ◽  
Discontinuous Precipitation ◽  
Phase Changes ◽  
Frequency Range ◽  
High Nitrogen ◽  
Prepared Material ◽  
Frequency Modulation Detection ◽  
Vibrating Reed

Internal friction (IF) and dynamic modulus measurements on a high nitrogen (0.8 wt%) austenitic steel in the temperature range from room temperature to 800 °C have been carried out by using a vibrating reed technique with electrostatic excitation and frequency modulation detection of flexural vibrations in the frequency range of kHz. The IF spectrum of the as-prepared material shows a broad peak superimposed to an exponentially increasing background. The discontinuous precipitation of Cr2N phase changes the characteristics of the peak. The results have been discussed by considering interstitial-substitutional (i-s) interactions.

Effect of heat treatment on the structural transformations and properties of high-nitrogen chromium steels

2000 ◽  
Vol 42 (6) ◽  
pp. 221-225 ◽  
Author(s):  
V. M. Blinov ◽  
A. V. Elistratov ◽  
A. G. Kolesnikov ◽  
A. G. Rakhshtadt ◽  
A. I. Plokhikh ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Structural Transformations ◽  
High Nitrogen ◽  
Chromium Steels

Modelling approach to support design of new high nitrogen austenitic steel for wind turbines components

2016 ◽  
Vol 40 (5) ◽  
pp. 419-425
Author(s):  
Federico Ruffini ◽  
Oriana Tassa ◽  
Claudio Guarnaschelli ◽  
Francesca Arcobello-Varlese ◽  
Walter Holweger ◽  
...  
Keyword(s):  
Austenitic Steel ◽  
Wind Turbines ◽  
High Nitrogen ◽  
Support Design ◽  
Modelling Approach
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