X-ray diffraction analysis of the residual stress state in PVD TiN/CrN multilayer coatings deposited on tool steel

2005 ◽  
Vol 200 (1-4) ◽  
pp. 165-169 ◽  
Author(s):  
C. Mendibide ◽  
P. Steyer ◽  
C. Esnouf ◽  
P. Goudeau ◽  
D. Thiaudière ◽  
...  
Keyword(s):  
Residual Stress ◽  
Stress State ◽  
Diffraction Analysis ◽  
Tool Steel ◽  
Multilayer Coatings ◽  
X Ray Diffraction ◽  
X Ray ◽  
Residual Stress State

Combined Neutron and X-Ray Diffraction Analysis for the Characterization of a Case Hardened Disc

2010 ◽  
Vol 652 ◽  
pp. 37-43 ◽  
Author(s):  
Jeremy Epp ◽  
Thomas Hirsch ◽  
Martin Hunkel ◽  
Robert C. Wimpory
Keyword(s):  
Residual Stress ◽  
Neutron Diffraction ◽  
Diffraction Analysis ◽  
Force Balance ◽  
X Ray Diffraction ◽  
X Ray ◽  
Residual Stress State ◽  
Systematic Uncertainties ◽  
Combined Use ◽  
Stress States

The present work has been executed within the framework of the collaborative research center on Distortion Engineering (SFB 570) in order to evaluate the residual stress state of a disc after carburizing and quenching as well as to validate a simulation procedure. The combined use of X-ray and neutron diffraction analysis provided information about the residual stress states in the whole cross section. However, the stress free lattice spacing d0 for the neutron diffraction experiments is problematic and induces systematic uncertainties in the results and the application of a force balance condition to recalculate d0 might be a solution for improving the reliability of the results. Comparison of experimental results with simulation showed that an overall satisfying agreement is reached but discrepancies are still present.

Hydrogen Interaction with Residual Stresses in Steel Studied by Synchrotron X-Ray Diffraction

2013 ◽  
Vol 772 ◽  
pp. 91-95 ◽  
Author(s):  
Eitan Dabah ◽  
Thomas Kannengiesser ◽  
Dan Eliezer ◽  
Thomas Boellinghaus
Keyword(s):  
Residual Stress ◽  
Stress State ◽  
Residual Stresses ◽  
High Energy ◽  
Steel Sample ◽  
Stainless Steel Sample ◽  
X Ray Diffraction ◽  
High Hydrogen ◽  
X Ray ◽  
Residual Stress State

The residual stress state in a material has an important role in the mechanism of cracking, induced or assisted by hydrogen. In this contribution, the beamline EDDI in BESSY II instrument in Berlin was used in order to investigate the influence of hydrogen upon the residual stresses state existing in a Supermartensitic stainless steel sample. The method used for investigating the residual stresses is the “sinus square ψ” method. This method involves the usage of high energy X-ray diffraction in order to measure the residual stress state and magnitude. It was found that hydrogen presence has a significant influence upon the magnitude of the residual stresses, as its value decreases with high hydrogen content. This effect is reversible, as hydrogen desorbs from the sample the residual stress magnitude gains its initial value before hydrogen charging.

scholarly journals Neutron and X-Ray Diffraction Residual Stress Measurements in Aluminium Alloys MIG Welded T-Joints after Friction Stir Processing

2014 ◽  
Vol 996 ◽  
pp. 439-444 ◽  
Author(s):  
João P. Nobre ◽  
António Castanhola Batista ◽  
Joana R. Kornmeier ◽  
José D. Costa ◽  
Altino Loureiro ◽  
...  
Keyword(s):  
Residual Stress ◽  
Fatigue Life ◽  
Stress State ◽  
Friction Stir Processing ◽  
Aluminium Alloys ◽  
X Ray Diffraction ◽  
T Joints ◽  
X Ray ◽  
Friction Stir ◽  
Residual Stress State

Friction Stir Processing (FSP) is a relatively new post-processing technique. Fatigue strength of MIG fillet welds of aluminium alloys can be substantially improved using FSP. Beyond other properties intrinsically tied to fatigue life, especially attention should be paid to the effect of the final residual stress state. In this study the residual stress distribution in T-joints of two aluminium alloys was determined by Neutron and X-ray diffraction. FSP effect on the residual stress state and fatigue life was analysed.

Statistical Errors in X-Ray Triaxial Stress Analysis by Cos α Method

2021 ◽  
Vol 1016 ◽  
pp. 423-428
Author(s):  
Shoichi Ejiri ◽  
Hiroaki Ohba ◽  
Toshihiko Sasaki
Keyword(s):  
Stress State ◽  
Stress Analysis ◽  
Measurement Theory ◽  
Triaxial Stress ◽  
X Ray Diffraction ◽  
New Techniques ◽  
X Ray ◽  
Statistical Errors ◽  
Residual Stress State ◽  
Metal Materials

Currently, the sin2ψ method is established as an effective technique as how to measure the residual stress state of metal materials non-destructively by X-ray diffraction. In recent years, new X-ray stress measurements with two-dimensional detector are developed and spreading in the world. There is the cosα method as one of the new techniques. However, the research about the statistical errors in the method continues. The measurement theory of the cos α method is reviewed on the triaxial stress state. The triaxial stress analysis by the method is examined and discussed from a viewpoint of the derived errors for the determination.

X-Ray Diffraction Analysis of Steel with Oxidised Surface Layer

2016 ◽  
Vol 368 ◽  
pp. 99-102
Author(s):  
Lukáš Zuzánek ◽  
Ondřej Řidký ◽  
Nikolaj Ganev ◽  
Kamil Kolařík
Keyword(s):  
Residual Stress ◽  
Surface Layer ◽  
Residual Stresses ◽  
Diffraction Analysis ◽  
Oxide Surface ◽  
X Ray Diffraction ◽  
X Ray ◽  
Electrolytic Polishing ◽  
Small Depth

The basic principle of the X-ray diffraction analysis is based on the determination of components of residual stresses. They are determined on the basis of the change in the distance between atomic planes. The method is limited by a relatively small depth in which the X-ray beam penetrates into the analysed materials. For determination of residual stresses in the surface layer the X-ray diffraction and electrolytic polishing has to be combined. The article is deals with the determination of residual stress and real material structure of a laser-welded steel sample with an oxide surface layer. This surface layer is created during the rolling and it prevents the material from its corrosion. Before the X-ray diffraction analysis can be performed, this surface layer has to be removed. This surface layer cannot be removed with the help of electrolytic polishing and, therefore, it has to be removed mechanically. This mechanical procedure creates “technological” residual stress in the surface layer. This additional residual stress is removed by the electrolytic polishing in the depth between 20 and 80 μm. Finally, the real structure and residual stresses can be determined by using the X-ray diffraction techniques.

X-Ray Diffraction Analysis Analyze the Error of Residual Stress by Using Mathematical Statistics

2010 ◽  
Vol 43 ◽  
pp. 687-690
Author(s):  
Ai Xin Feng ◽  
Chuan Chao Xu ◽  
Yu Peng Cao ◽  
Huai Yang Sun ◽  
Gui Fen Ni ◽  
...  
Keyword(s):  
Residual Stress ◽  
Aluminum Alloy ◽  
Statistical Analysis ◽  
Diffraction Analysis ◽  
Hypothesis Testing ◽  
Normal Distribution ◽  
X Ray Diffraction ◽  
X Ray ◽  
7050 Aluminum Alloy ◽  
Stress Error

X-ray diffraction analysis methods analyze the residual stress the same location for 50 times of 7050 aluminum alloy. And taking residual stress error for statistical analysis, through hypothesis testing and analysis of the residual stress error Square diagram, obtain X-ray diffraction the residual stress error of the 7050 aluminum alloy approximately obey normal distribution.

Position Resolved Residual Stress Determination in Alumina-Zirconia Multilayered Ceramics

2008 ◽  
Vol 571-572 ◽  
pp. 421-425
Author(s):  
Guenther A. Maier ◽  
Jozef Keckes ◽  
Jens Brechbuehl ◽  
Hugues Guerault ◽  
Raúl Bermejo
Keyword(s):  
Residual Stress ◽  
Stress Distribution ◽  
X Ray Diffraction ◽  
Correct Evaluation ◽  
Indentation Method ◽  
Element Analysis ◽  
Stress Evaluation ◽  
X Ray ◽  
Residual Stress State ◽  
Experimental Findings

Alumina-zirconia multilayered ceramics have been proposed as an alternative for the design of structural ceramics with improved fracture toughness and strength reliability. During the processing of these laminates, significant residual stresses may arise due to the thermal expansion mismatch between adjacent layers. The correct evaluation of such stress distribution in the laminate may determine its range of application. In this work, the residual stress state in a layered material designed with five thick alumina layers of approximately 650 microns alternated with four thin alumina-zirconia layers of approximately 140 microns was estimated using different methods. A finite element analysis (FEM) was performed for stress evaluation in the bulk and an indentation method and X-Ray diffraction to account for stresses at the surface. Experimental findings show a constant stress distribution within the bulk for each layer, while at the surface stress position dependence is observed in the alumina layers, being the maximum tensile stresses near the layer interface. The accuracy of the results provided by each technique is discussed.

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