Critical grain size to limit the hydrogen-induced ductility drop in a metastable austenitic steel

2015 ◽  
Vol 40 (33) ◽  
pp. 10697-10703 ◽  
Author(s):  
Arnaud Macadre ◽  
Nobuo Nakada ◽  
Toshihiro Tsuchiyama ◽  
Setsuo Takaki
Keyword(s):  
Grain Size ◽  
Austenitic Steel ◽  
Metastable Austenitic Steel ◽  
Critical Grain Size

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.

scholarly journals The role of grain size in static and cyclic deformation behaviour of a laser reversion annealed metastable austenitic steel

2020 ◽  
Vol 44 (1) ◽  
pp. 43-62 ◽  
Author(s):  
Matthias Droste ◽  
Antti Järvenpää ◽  
Matias Jaskari ◽  
Mykhaylo Motylenko ◽  
Anja Weidner ◽  
...  
Keyword(s):  
Grain Size ◽  
Austenitic Steel ◽  
Cyclic Deformation ◽  
Deformation Behaviour ◽  
Metastable Austenitic Steel

Microstructure and properties of violin strings made of metastable austenitic steel

2009 ◽  
Vol 100 (11) ◽  
pp. 1557-1565 ◽  
Author(s):  
Rüdiger Haas ◽  
H. Peter Degischer ◽  
Peter Pongratz ◽  
Anke R. Pyzalla
Keyword(s):  
Austenitic Steel ◽  
Microstructure And Properties ◽  
Metastable Austenitic Steel

Strain hardening of metastable austenitic steel under repeated simple loading at different temperatures

1997 ◽  
Vol 29 (6) ◽  
pp. 605-610
Author(s):  
L. V. Zaitseva ◽  
B. I. Koval'chuk ◽  
V. V. Kosarchuk
Keyword(s):  
Strain Hardening ◽  
Austenitic Steel ◽  
Simple Loading ◽  
Metastable Austenitic Steel ◽  
Different Temperatures

Acoustic emission measurements on metastable austenitic steel oligocrystals

2021 ◽  
Vol 827 ◽  
pp. 142066
Author(s):  
R. Lehnert ◽  
A. Franke ◽  
H. Biermann ◽  
A. Weidner
Keyword(s):  
Acoustic Emission ◽  
Austenitic Steel ◽  
Metastable Austenitic Steel
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