Substructural and carbide transformations during plastic deformation in tempered chromium-nickel martensitic steel

1992 ◽  
Vol 35 (12) ◽  
pp. 1117-1123
Author(s):  
�. V. Kozlov ◽  
N. A. Popova ◽  
L. N. Ignatenko ◽  
L. A. Teplyakova ◽  
A. A. Klopotov ◽  
...  
Keyword(s):  
Plastic Deformation ◽  
Martensitic Steel ◽  
Carbide Transformations

Effects of Grain Refinement and Predeformation Impact by Severe Plastic Deformation on Creep in P92 Martensitic Steel

2019 ◽  
Vol 22 (1) ◽  
pp. 1900448 ◽  
Author(s):  
Vaclav Sklenicka ◽  
Petr Kral ◽  
Jiri Dvorak ◽  
Yoichi Takizawa ◽  
Takahiro Masuda ◽  
...  
Keyword(s):  
Plastic Deformation ◽  
Severe Plastic Deformation ◽  
Grain Refinement ◽  
Martensitic Steel

scholarly journals EFFECT OF SEVERE PLASTIC DEFORMATION ON RADIATION HARDENING OF T91 FERRITIC-MARTENSITIC STEEL

2021 ◽  
pp. 35-42
Author(s):  
V.N. Voyevodin ◽  
G.D. Tolstolutskaya ◽  
S.A. Karpov ◽  
A.N. Velikodnyi ◽  
M.A. Tikhonovsky ◽  
...  
Keyword(s):  
Plastic Deformation ◽  
Severe Plastic Deformation ◽  
Martensitic Steel ◽  
Ion Irradiation ◽  
Dose Range ◽  
Fold Increase ◽  
Radiation Hardening ◽  
Dislocation Loops ◽  
Transmission Electron ◽  
Means Of Transmission

Effect of thermomechanical treatment on radiation hardening behavior in T91 ferritic-martensitic steel was evaluated. An applying of severe plastic deformation (SPD) by the “upsetting-extrusion” method and subsequent heat treatment led to a considerable grain refinement, crushing of martensite lamellas, reduction of MX carbides size and their more uniform distribution. Nanoindentation measurements of SPD-modified steel revealed a 1.4-fold increase in the hardness relative to the initial steel. Irradiation response of modified steel was examined after 1.4 MeV Ar+ ion irradiations in the dose range of 10…45 displacements per atom (dpa) at room temperature and 460 °C. Microstructure characterization was performed by means of transmission electron microscopy (TEM). It was found that dislocation loops and nano-sized argon bubbles dominated the damage microstructure after ion irradiation. The effects of SPD-induced transformations as well as nano-bubbles formation are discussed regarding to the hardening phenomenon observed in irradiated steel.

scholarly journals On the application of magnetoelastic properties measurements for plastic level determination in martensitic steels

2018 ◽  
Vol 69 (6) ◽  
pp. 502-506 ◽  
Author(s):  
Leszek Piotrowski ◽  
Marek Chmielewski ◽  
Zbigniew Kowalewski
Keyword(s):  
Plastic Deformation ◽  
Domain Walls ◽  
Martensitic Steel ◽  
Magnetic Domain ◽  
Martensitic Steels ◽  
Reliable Determination ◽  
Magnetoelastic Properties ◽  
Tension And Compression ◽  
Deformation Level ◽  
Non Destructive

Abstract The change in the dislocation density, induced by plastic deformation, influences strongly the magnetic domain structure inside the material. Being so, classic parameters, like the coercivity or magnetic permeability, can be a good measure of the deformation level, yet their reliable determination in a non-destructive way in industrial environment is problematic. The magnetoacoustic emission (MAE) which results from the non-180° domain walls (DW) movement in materials with non-zero magnetostriction can be used as an alternative. The intensity of the MAE signal changes strongly as a result of plastic deformation for both tensile and compressive deformation. It is however possible to discern those cases by analysing the changes in the shape of the MAE signal envelopes. The set of the martensitic steel samples (P91) deformed up to 10% (for both tension and compression) was investigated. Due to geometrical limitations imposed by the special mounting system, enabling compression without buckling, the sample had the shape resulting in low signal to noise (S/N) ratio. Being so the optimization of FFT filtering and wavelet analysis was performed in order to improve sensitivity of the proposed method of deformation level determination.

173 Influence of plastic deformation history on electromagnetic NDT signals of Reduced-activation Ferritic/Martensitic steel

2018 ◽  
Vol 2018.53 (0) ◽  
pp. 143-144
Author(s):  
Manru He ◽  
Takanori MATSUMOTO ◽  
Tetsuya UCHIMOTO ◽  
Toshiyuki TAKAGI ◽  
Zhenmao Chen
Keyword(s):  
Plastic Deformation ◽  
Martensitic Steel ◽  
Deformation History

TEM Study of Martensite Microstructure in the Junctions of Laths in Low-Carbon Chromium Steel after LCF III

2019 ◽  
Vol 827 ◽  
pp. 306-311
Author(s):  
Tamaz Eterashvili ◽  
T. Dzigrashvili ◽  
M. Vardosanidze
Keyword(s):  
Plastic Deformation ◽  
Deformation Process ◽  
Martensitic Steel ◽  
Chromium Steel ◽  
Low Carbon ◽  
Slip Bands ◽  
Microcrack Initiation ◽  
The Individual ◽  
Martensite Microstructure ◽  
Carbon Martensitic Steel

TEM study of junctions between martensite packets (laths) and their microstructure in low-carbon martensitic steel were studied. It was revealed that formation of slip bands commences at junctions between laths. Heavy changes in microstructure occur at junctions of packets and in the near-boundary laths because of plastic deformation of martensite. A number of typical junctions between the laths after LCF are considered. Deformation process within the individual packet occurs inhomogeneously, some of the laths deform more heavily than the others. The coarser slip bands group within large laths and run along their whole lengths. It was shown that the above microstructure changes strongly affect the cyclic fracture of the steel. Some concrete sites of microcrack initiation are indicated.

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