Effect of grain size on strain-induced martensitic transformation start temperature in an ultrafine grained metastable austenitic steel

2011 ◽  
Vol 17 (4) ◽  
pp. 553-556 ◽  
Author(s):  
Yeon-Seung Jung ◽  
Young-Kook Lee ◽  
David K. Matlock ◽  
Martin C. Mataya
Keyword(s):  
Grain Size ◽  
Martensitic Transformation ◽  
Austenitic Steel ◽  
Metastable Austenitic Steel ◽  
Ultrafine Grained ◽  
Start Temperature

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.

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

Reversible Martensitic Transformation Produced by Severe Plastic Deformation of Metastable Austenitic Steel

2013 ◽  
Vol 738-739 ◽  
pp. 491-495 ◽  
Author(s):  
Igor Litovchenko ◽  
Alexander Tyumentsev ◽  
Alexander V. Korznikov
Keyword(s):  
Plastic Deformation ◽  
High Pressure ◽  
Martensitic Transformation ◽  
Severe Plastic Deformation ◽  
Dynamic Recrystallization ◽  
Austenitic Steel ◽  
High Pressure Torsion ◽  
Martensitic Transformations ◽  
Metastable Austenitic Steel ◽  
Nanostructured States

The peculiarities of martensitic transformations and formation of nanostructured states in metastable austenitic steel (Fe-18Cr-8Ni-Ti) after severe plastic deformation by high pressure torsion are investigated. It is shown that during severe plastic deformation with increased strain rate not only direct (γ→α΄) but also reverse (α΄→γ) martensitic transformations occur, which is revealed by the changes in the volume content of α΄ - martensite during deformation. The fragments thought to be formed by direct and reverse martensitic transformations and those of dynamic recrystallization of austenite are observed.

Relationship between grain size and martensitic transformation start temperature in a Ti–30Ni–20Cu alloy ribbon

2008 ◽  
Vol 59 (11) ◽  
pp. 1186-1189 ◽  
Author(s):  
Seok-won Kang ◽  
Yong-hee Lee ◽  
Yeon-min Lim ◽  
Jung-min Nam ◽  
Tae-hyun Nam ◽  
...  
Keyword(s):  
Grain Size ◽  
Martensitic Transformation ◽  
Alloy Ribbon ◽  
Start Temperature

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

scholarly journals Variant Selection in Mechanically-induced Martensitic Transformation of Metastable Austenitic Steel

2005 ◽  
Vol 45 (8) ◽  
pp. 1217-1219 ◽  
Author(s):  
Seung Hyun LEE ◽  
Jun-Yun KANG ◽  
Heung Nam HAN ◽  
Kyu Hwan OH ◽  
Hu-Chul LEE ◽  
...  
Keyword(s):  
Martensitic Transformation ◽  
Austenitic Steel ◽  
Variant Selection ◽  
Metastable Austenitic Steel
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