scholarly journals A comparison of adiabatic shear bands in wrought and additively manufactured 316L stainless steel using nanoindentation and electron backscatter diffraction

2019 ◽  
Vol 55 (4) ◽  
pp. 1738-1752 ◽  
Author(s):  
Jordan S. Weaver ◽  
Veronica Livescu ◽  
Nathan A. Mara
Keyword(s):  
Stainless Steel ◽  
316L Stainless Steel ◽  
Electron Backscatter Diffraction ◽  
Shear Bands ◽  
Adiabatic Shear ◽  
Adiabatic Shear Bands ◽  
Electron Backscatter ◽  
Backscatter Diffraction

Analysis and characterization by electron backscatter diffraction of microstructural evolution in the adiabatic shear bands in Fe–Cr–Ni alloys

2009 ◽  
Vol 24 (8) ◽  
pp. 2617-2627 ◽  
Author(s):  
Huajie Yang ◽  
Yongbo Xu ◽  
Yasuaki Seki ◽  
Vitali F. Nesterenko ◽  
Marc André Meyers
Keyword(s):  
Microstructural Evolution ◽  
Electron Backscatter Diffraction ◽  
Shear Bands ◽  
Adiabatic Shear ◽  
Adiabatic Shear Bands ◽  
Localized Deformation ◽  
Ni Alloys ◽  
Electron Backscatter ◽  
Backscatter Diffraction ◽  
Equiaxed Grains

The microstructural evolution inside adiabatic shear bands in Fe–Cr–Ni alloys dynamically deformed (strain rates > 104 s−1) by the collapse of an explosively driven, thick-walled cylinder under prescribed strain conditions was examined by electron backscatter diffraction. The observed structure within the bands consisted of both equiaxed and elongated grains with a size of ∼200 nm. These fine microstructures can be attributed to recrystallization; it is proposed that the elongated grains may be developed simultaneously with localized deformation (dynamic recrystallization), and the equiaxed grains may be formed subsequently to deformation (static recrystallization). These recrystallized structures can be explained by a rotational recrystallization mechanism.

Characterization of Amorphous Oxide Nano-Thick Layers on 316L Stainless Steel by Electron Channeling Contrast Imaging and Electron Backscatter Diffraction

2016 ◽  
Vol 22 (5) ◽  
pp. 997-1006 ◽  
Author(s):  
Mahrokh Dorri ◽  
Stéphane Turgeon ◽  
Nicolas Brodusch ◽  
Maxime Cloutier ◽  
Pascale Chevallier ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Oxide Layer ◽  
316L Stainless Steel ◽  
Electron Backscatter Diffraction ◽  
Contrast Imaging ◽  
Amorphous Oxide ◽  
Electron Channeling ◽  
Electron Backscatter ◽  
Backscatter Diffraction

AbstractCharacterization of the topmost surface of biomaterials is crucial to understanding their properties and interactions with the local environment. In this study, the oxide layer microstructure of plasma-modified 316L stainless steel (SS316L) samples was analyzed by a combination of electron backscatter diffraction and electron channeling contrast imaging using low-energy incident electrons. Both techniques allowed clear identification of a nano-thick amorphous oxide layer, on top of the polycrystalline substrate, for the plasma-modified samples. A methodology was developed using Monte Carlo simulations combined with the experimental results to estimate thickness of the amorphous layer for different surface conditions. X-ray photoelectron spectroscopy depth profiles were used to validate these estimations.

Microstructural Development around Crater in Commercial Pure Titanium

2016 ◽  
Vol 849 ◽  
pp. 238-244
Author(s):  
Ying Chao Li ◽  
Bo Long Li ◽  
Tong Bo Wang ◽  
Zhen Qiang Wang ◽  
Zuo Ren Nie
Keyword(s):  
Electron Backscatter Diffraction ◽  
Adiabatic Shear Band ◽  
Shear Bands ◽  
Pure Titanium ◽  
Adiabatic Shear ◽  
Microstructural Development ◽  
Adiabatic Shear Bands ◽  
Titanium Plate ◽  
Commercial Pure Titanium ◽  
Backscatter Diffraction

The commercial pure titanium plate was shot vertically by the projectile with a diameter of 7.62mm at impact velocities ranging from 782m/s to 825m/s. The microstructure around the crater of commercial pure titanium plate was analyzed by optical microscopy (OM) and electron backscatter diffraction (EBSD) methods. It was found that different microstructures were observed along the depth of cater. In upper region of the crater, grains were deformed and fragmented. Adiabatic shear bands (ASBs) were observed in the middle of the crater, and some ASBs were bifurcated. At the bottom of the crater, the grains were less deformed, and the deformation twins were formed. The microstructures in the center of adiabatic shear band were mainly consisted of the dynamic recrystallization grains and sub-grains. The microstructure in the transition region was elongated grains along the shear stress distribution.

scholarly journals Phenomena of Adiabatic Shear Bands Forming of Structural Steels Under Impact Load Conditions

2020 ◽  
Vol 50 (2) ◽  
pp. 315-337
Author(s):  
Michał Gmitrzuk ◽  
Lech Starczewski
Keyword(s):  
Electron Backscatter Diffraction ◽  
Impact Load ◽  
Shear Bands ◽  
Adiabatic Shear ◽  
Adiabatic Shear Bands ◽  
High Speeds ◽  
Impact Forces ◽  
Deformation Speed ◽  
Backscatter Diffraction ◽  
Ebsd Method

AbstractThe paper presents the results of an experimental study on adiabatic shear bands (ASB) in two grades of steel with three different microstructures. Samples were subjected to impact forces in order to obtain a targeted shear band. The process of deforming the samples was carried out with a bar impact rod moving at high speeds in the range of 1.4 m/s to 16.5 m/s was carried out. Microstructural studies of deformed samples were performed using the Electron Backscatter Diffraction (EBSD) method. The results of the experiments show that the ASB type depends on the initial microstructure of the material and the deformation speed. It has been shown that, depending on the type of microstructure, ASBs are characterized by a different mechanism of formation and show different character.

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