Study of Stresses in Texture Components Using Neutron Diffraction

2013 ◽  
Vol 768-769 ◽  
pp. 289-295
Author(s):  
Andrzej Baczmański ◽  
Elżbieta Gadalińska ◽  
Sebastian Wroński ◽  
Léa Le Joncour ◽  
Benoit Panicaud ◽  
...  
Keyword(s):  
Experimental Data ◽  
Neutron Diffraction ◽  
Tensile Load ◽  
Group Method ◽  
Model Calculations ◽  
Lattice Strains ◽  
Consistent Model ◽  
Self Consistent ◽  
Full Stress Tensor

In this work a new method for analysis of neutron diffraction results obtained during “in situ” tensile load is proposed and tested. The methodology is based on the measurements of lattice strains during “in situ” tensile test for several hkl reflections and for different orientations of the sample with respect to the scattering vector. As the result the full stress tensor for preferred texture orientations in function of applied stress can be determined with help of crystallite group method. The experimental data are presented and compared with self-consistent model calculations performed for groups of grains corresponding to the measured hkl reflections.

Localization of Stresses in Polycrystalline Grains Measured by Neutron Diffraction and Predicted by Self-Consistent Model

2011 ◽  
Vol 681 ◽  
pp. 103-108
Author(s):  
Anita Gaj ◽  
Lea le Joncour ◽  
Andrzej Baczmanski ◽  
Sebastian Wroński ◽  
Benoit Panicaud ◽  
...  
Keyword(s):  
Neutron Diffraction ◽  
Load Transfer ◽  
Diffraction Method ◽  
Lattice Strains ◽  
Consistent Model ◽  
Self Consistent ◽  
Main Component ◽  
Critical Resolved Shear Stress ◽  
Elastic Lattice

Time of flight neutron diffraction method was applied to measure elastic lattice strains in austenitic steel during "in situ" tensile test. Comparing experimental data with self-consistent model, the critical resolved shear stress and hardening parameters were determined for polycrystalline grains. The result allowed us to determine the main component of the stress localization tensor, relating the rate of grain stress with the applied macrostress rate. The evolution of concentration tensor in function of the applied macrostress was analyzed. Finally, the load transfer between grains during yielding of the sample was studied.

Lattice Strain Pole Figures Analysis in Titanium during Uniaxial Deformation

2017 ◽  
Vol 905 ◽  
pp. 74-80
Author(s):  
David Gloaguen ◽  
Baptiste Girault ◽  
Jamal Fajoui ◽  
Vincent Klosek ◽  
Marie José Moya
Keyword(s):  
Experimental Data ◽  
Neutron Diffraction ◽  
Lattice Strain ◽  
Pure Titanium ◽  
Tensile Load ◽  
Uniaxial Tensile ◽  
Lattice Strains ◽  
Pole Figures ◽  
In Situ Neutron Diffraction

A theoretical and experimental study was carry out to investigate deformation mechanisms in a textured titanium alloy. In situ neutron diffraction measurements were performed to analyze different {hk.l} family planes ({10.0}, {10.1}, {11.0} and {00.2}) and determine the corresponding internal strain pole figures. This method was applied to a pure titanium (a-Ti) submitted to a uniaxial tensile load up to 2 %. The experimental data was then used to validate the EPSC model in order to predict the distribution of lattice strains determined by neutron diffraction for various diffraction vector directions. This comparison reveals that the model results were in good agreement with the experimental data and the simulations reproduced the lattice strain development observed on the strain pole figures determined by neutron diffraction.

Elastoplastic Deformation and Damage Process in Duplex Steel Studied Using Synchrotron and Neutron Diffraction

2017 ◽  
Vol 905 ◽  
pp. 9-16
Author(s):  
Yu Chen Zhao ◽  
Léa Le Joncour ◽  
Andrzej Baczmański ◽  
Manuel François ◽  
Sebastian Wroński ◽  
...  
Keyword(s):  
Neutron Diffraction ◽  
Synchrotron Diffraction ◽  
X Ray ◽  
Slip Mechanism ◽  
Lattice Strains ◽  
Duplex Steel ◽  
Consistent Model ◽  
Damage Process ◽  
Crystallographic Planes

In the present work, the mechanical behavior of phases in duplex steel during tensile test was studied. Special interest was taken in the analysis of damage process just before failure. In this aim two diffraction methods: in-situ time of flight neutron diffraction and X-ray synchrotron diffraction were applied. Using diffraction data, the slip mechanism on crystallographic planes during plastic deformation was investigated. In the case of aged UR45N steel, it was found that significant softening caused by damage process was initiated in the ferritic phase. The lattice strains measured in situ by two above mentioned diffraction methods were compared with prediction of the self-consistent model.

Effects of Texture and Anisotropy on Intergranular Stress Development in Zirconium

2005 ◽  
Vol 495-497 ◽  
pp. 1553-1558 ◽  
Author(s):  
E.C. Oliver ◽  
Mark R. Daymond ◽  
Philip J. Withers
Keyword(s):  
Experimental Data ◽  
Neutron Diffraction ◽  
Significant Role ◽  
Basal Slip ◽  
Compressive Deformation ◽  
Stress Evolution ◽  
Model Calculations ◽  
Stress Development ◽  
Self Consistent ◽  
Plane Compression

The influence of texture and anisotropy on the generation of intergranular stresses in clock-rolled zirconium is investigated using neutron diffraction and elastoplastic self-consistent modelling. Comparison between experimental data and model calculations indicates that the operation mainly of prismatic and basal slip explains the trends in intergranular stress evolution during in-plane tensile and through-thickness compressive deformation, whilst twinning plays a significant role during in-plane compression.

On the Development of Grain-Orientation-Dependent and Inter-Phase Stresses in a Super Duplex Stainless Steel under Uniaxial Loading

2006 ◽  
Vol 524-525 ◽  
pp. 917-922 ◽  
Author(s):  
Ru Lin Peng ◽  
Yan Dong Wang ◽  
Guo Cai Chai ◽  
Nan Jia ◽  
Sten Johansson ◽  
...  
Keyword(s):  
Plastic Deformation ◽  
Stainless Steel ◽  
Neutron Diffraction ◽  
Grain Orientation ◽  
Super Duplex Stainless Steel ◽  
Lattice Strains ◽  
Duplex Steel ◽  
In Situ Neutron Diffraction ◽  
Phase Stresses

Microstresses due to intergranular and inter-phase interactions in an austenitic-ferritic super duplex steel (SAF 2507) under uniaxial compressive deformation have been studied by in-situ neutron diffraction experiments. Lattice strains of several hkl planes of austenite respective ferrite were mapped as a function of sample direction at a number of load levels during loading into the plastic regime and unloading. The analysis of the experimental results has shown that during loading both grain-orientation-dependent and inter-phase stresses were generated under plastic deformation that was inhomogeneous at the microstructural level. Residual stresses depending on the grain-orientation and phase have been found after unloading. The results also indicate stronger intergranular interactions among the studied hkl planes of austenite than those of ferrite.

Neutron Diffraction Study of Elastoplastic Behaviour of Al/SiCp Metal Matrix Composite

2017 ◽  
Vol 905 ◽  
pp. 66-73
Author(s):  
Elżbieta Gadalińska ◽  
Andrzej Baczmański ◽  
Sebastian Wroński ◽  
Mirosław Wróbel ◽  
Alain Lodini ◽  
...  
Keyword(s):  
Neutron Diffraction ◽  
Metal Matrix Composite ◽  
Matrix Composite ◽  
Metal Matrix ◽  
Tensile Deformation ◽  
Neutron Radiation ◽  
Neutron Diffraction Study ◽  
Lattice Strains ◽  
Critical Resolved Shear Stress

The TOF neutron diffraction measurements were done for Al/SiCp metal–matrix composite (17% of SiC) subjected to T6 thermal treatment. Using three separated diffraction peaks of SiC phase and four peaks of Al phase, the lattice strains were measured for both phases independently during in situ tensile test. The experimental results were presented in comparison with elastoplastic model, which allows to find the values of parameters determining plastic deformation of Al matrix (critical resolved shear stress and hardening parameter). Additionally, the results of TOF method were compared with those which were obtained with monochromatic neutron radiation (LLB, Saclay). In the latter experiment Al/SiCp composite containing 25% of SiC was measured. It was shown that after elastoplastic deformation the mismatch stresses determined for both phases relax during tensile deformation.

Microstresses Determined by Neutron Diffraction and Self-consistent Model

2006 ◽  
pp. 477-486
Author(s):  
A. Baczmanski ◽  
C. Braham ◽  
R. Levy-Tubiana ◽  
A. Lodini ◽  
K. Wierzbanowski
Keyword(s):  
Neutron Diffraction ◽  
Consistent Model ◽  
Self Consistent

Deformation Behaviour of TRIP Steel Monitored by In Situ Neutron Diffraction

2014 ◽  
Vol 939 ◽  
pp. 25-30
Author(s):  
Jozef Zrník ◽  
Ondrej Muránsky ◽  
Petr Sittner
Keyword(s):  
Neutron Diffraction ◽  
Trip Steel ◽  
Retained Austenite ◽  
Volume Fraction ◽  
Tensile Deformation ◽  
Deformation Behaviour ◽  
Tensile Load ◽  
Ferrite Matrix ◽  
Granular Bainite

The paper presents results ofin-situneutron diffraction experiments aimed on monitoring the phase evolution and load distribution in transformation induced plasticity (TRIP) steel when subjected to tensile loading. Tensile deformation behaviour of two TRIP-assisted multiphase steel with slightly different microstructures resulted from different thermo-mechanical treatments applied was investigated byin-situneutron diffraction. The steel with lower retained austenite volume fraction (fγ=0.04) and higher volume fraction of needle-like bainite in the α-matrix exhibits higher yield stress (sample B, 600MPa) but considerably lower elongation in comparison to the steel with higher austenite volume fraction (fγ=0.08), granular bainite and ferrite matrix (sample A, 500 MPa). The neutron diffraction results showed that the applied tensile load is redistributed at the yielding point in a way that the retained austenite bears a significantly larger load than the α-matrix during the TRIP steel deformation. Steel sample with higher volume fraction of retained austenite and less strong ferrite matrix proved to be a better TRIP steel with respect to strength, ductility and the side effect of the strain induced austenite-martensite transformation. The transforming retained austenite in time of loading provides potential for higher ductility of experimental TRIP steel but at the same time acts as a reinforcement phase during the further plastic deformation.TRIP steel, austenite conditioning, austenite transformation, structure, retained austenite, tensile deformation, neutron diffraction, load partitioning, mechanical properties.

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