scholarly journals Measurements of Residual Stresses in a Shape Welded Steel Tube by Neutron and X-Ray Diffraction

1999 ◽  
Vol 33 (1-4) ◽  
pp. 231-242 ◽  
Author(s):  
H. Kockelmann ◽  
G. D. Bokuchava ◽  
J. Schreiber ◽  
Yu. V. Taran
Keyword(s):  
Residual Stresses ◽  
Steel Tube ◽  
The Finite Element Method ◽  
X Ray Diffraction ◽  
Welded Steel ◽  
X Ray ◽  
Compressive Stresses ◽  
Theoretical Predictions ◽  
Strain Components ◽  
Tangential Directions

Shape welding of a ferritic steel layer on an austenitic steel tube is used to build compressive stresses on its outer surface, and as a result, suppress stress corrosion. Investigations of residual stresses in such bi-layer tubes are important for developing optimal welding techniques. The neutron and X-ray diffraction methods were used to analyze the stress behavior around the welded region on the tube. To this end, strain components in the radial, axial and tangential directions were measured across the weld. The results are compared to the data obtained by the destructive turning out technique and theoretical predictions by the finite element method.

Influence of deposition parameters on the residual stresses of WC-Wo sputtered thin films

MRS Advances ◽  
2020 ◽  
Vol 5 (23-24) ◽  
pp. 1215-1223
Author(s):  
R.R. Phiri ◽  
O.P. Oladijo ◽  
E.T. Akinlabi
Keyword(s):  
Thin Films ◽  
Residual Stress ◽  
Residual Stresses ◽  
Substrate Surface ◽  
Tribological Performance ◽  
X Ray Diffraction ◽  
X Ray ◽  
Compressive Stresses ◽  
Deposition Parameters ◽  
Cobalt Thin Films

AbstractControl and manipulation of residual stresses in thin films is a key for attaining coatings with high mechanical and tribological performance. It is therefore imperative to have reliable residual stress measurements methods to further understand the dynamics involved. The sin2ψ method of X-ray diffraction was used to investigate the residual stresses on the tungsten carbide cobalt thin films deposited on a mild steel surface to understand the how the deposition parameters influence the generation of residual stresses within the substrate surface. X-ray spectra of the surface revealed an amorphous phase of the thin film therefore the stress measured was of the substrate surface and the effects of sputtering parameters on residual stress were analysed. Compressive stresses were identified within all samples studied. The results reveal that as the sputtering parameters are varied, the residual stresses also change. Optimum deposition parameters in terms of residual stresses were suggested.

X-Ray Diffraction Measurements of Residual Stress Induced by Surface Compressing Methods

2012 ◽  
Vol 729 ◽  
pp. 199-204 ◽  
Author(s):  
Dávid Cseh ◽  
Valéria Mertinger
Keyword(s):  
Residual Stress ◽  
Residual Stresses ◽  
Surface Region ◽  
X Ray Diffraction ◽  
X Ray ◽  
Hardened Alloy ◽  
Compressive Stresses ◽  
Machine Parts ◽  
Stress States ◽  
Operational Behaviour

Residual stresses have a fundamental effect on the operational behaviour and lifetime of industrial products. The fatigue resistance of machine parts can be increased by introducing residual compressive stresses into the surface region. For certain machine parts especially in the vehicle industry the residual stress is strongly demanded by the quality control. For this reason, measuring the stress accurately is becoming increasingly important. The Almen test, which only gives a qualitative result, is widely used in the industry. Shot peening and rolling are methods which are suitable for creating elastic residual stresses. This paper examines the technologies used by Rába Futómű Nyrt. to increase the lifetime by means of residual stress. We performed analysis of the residual stress of samples shot peened the same way but under different heat treatment states. We compared the residual stress values of burnished and hardened shaft joints, and the residual stress states of gear made of hardened alloy, comparing the carbonized ones to ones which were shot peened under small intensity.

scholarly journals X-Ray Diffraction Analysis of Residual Stresses in the Premium Rails Welded by Flash Butt Process

2020 ◽  
Vol 25 ◽  
Author(s):  
Bras Senra de Oliveira ◽  
Lino Alberto Soares Rodrigues ◽  
Ednelson Silva Costa ◽  
Eduardo de Magalhães Braga ◽  
Marcos Allan Leite dos Reis
Keyword(s):  
Residual Stresses ◽  
Stress Measurement ◽  
Surface Hardness ◽  
Welding Process ◽  
X Ray Diffraction ◽  
Butt Welding ◽  
X Ray ◽  
Compressive Stresses ◽  
Non Destructive ◽  
Welding Technique

Abstract: This work is distinguished by searching for a non-destructive technology, and X-ray diffraction was validated by the XStress 3000 analyser. Measurements of residual stresses in the welded zone of premium pearlitic rails was performed, rail surface hardness of 370 HB and 0.79% carbon content. The welding of the rails was done by flash butt process, performed by Schlatter GAAS 80 stationary equipment. The results of the tensile and compressive stress measurements identified the residual stresses in the welded zone, with specific zones of tensile stresses misplaced at the weld center, with values up to 391 MPa, and compressive stresses, with values up to -166 MPa, as it moves away rails weld center. An important point of this study is the residual stress measurement considering a complete welding process, including: pre-grinding, flash butt welding, heat treatment, finishing grinding and straightening. Lastly, was observed the welding technique potentially can induce residual stresses at rails.

Effect of Nozzle-Traveling Velocity on Oil Cavitation Jet Peening of Aluminum Alloy, AA 6063-T6

2007 ◽  
Vol 129 (4) ◽  
pp. 609-613 ◽  
Author(s):  
A. Sahaya Grinspan ◽  
R. Gnanamoorthy
Keyword(s):  
Aluminum Alloy ◽  
Residual Stresses ◽  
Cavitation Number ◽  
X Ray Diffraction ◽  
X Ray ◽  
Compressive Stresses ◽  
Modification Process ◽  
Oil Jet ◽  
The Impact ◽  
Compressive Residual Stresses

A new surface modification process was developed to introduce compressive residual stresses at the surface of components. In this process, instead of oil droplets a high-velocity cavitation jet (cloud of oil bubbles) impinges on the surface of the component to be peened. The impact pressure generated during implosion of cavitation bubbles causes severe plastic deformation at the surface. Consequently, beneficial compressive stresses are developed at the surface. In order to find the potential of this process, aluminum alloy AA6063-T6 specimens were peened at a constant cavitation number with various nozzle-traveling velocities. Residual stress induced by oil jet cavitation peening was measured using X-ray diffraction. Oil cavitation jet peening results in a smooth and hard surface. The developed compressive residual stresses at the peened surface are about 52%, 42%, and 35% of yield strength in samples for peened at nozzle traveling velocities of 0.05mm∕s, 0.10mm∕s, and 0.15mm∕s, respectively.

In Situ Stress Measurements during Welding Process

2017 ◽  
Vol 905 ◽  
pp. 137-142
Author(s):  
Tatsumi Hirano ◽  
Daiko Takamatsu ◽  
Kosuke Kuwabara ◽  
Shuo Yuan Zhang ◽  
Takahisa Shobu ◽  
...  
Keyword(s):  
Residual Stresses ◽  
Phase Transformations ◽  
Welding Process ◽  
Tig Welding ◽  
Low Carbon ◽  
X Ray Diffraction ◽  
Large Area ◽  
X Ray ◽  
Compressive Stresses

Welding technologies are indispensable for fabricating various industrial structures and must be highly reliable. Since tensile residual stresses at surface after welding cause crack progress, it is important to understand how stresses built up during the welding process in order to optimize final residual stresses as reduced tensile or introduced compressive stresses. Therefore, we conducted in-situ measurements of phase transformations, stresses and temperatures during tungsten inert gas (TIG) welding to understand how stresses built up. X-ray diffraction rings were detected per 0.1 sec during TIG welding by using a large-area two-dimensional detector and the accuracy of the stress analysis was estimated to be 8 MPa using the sin2ψ technique. In this paper, we described the phase transformations of ferrite low-carbon rolled steel and the changes in stresses during TIG welding.

scholarly journals X-Ray Measurement of Residual Stresses in Titanium Alloy Sheet

1966 ◽  
Vol 10 ◽  
pp. 295-310 ◽  
Author(s):  
David N. Braski ◽  
Dick M. Royster
Keyword(s):  
Titanium Alloy ◽  
Residual Stresses ◽  
Glass Bead ◽  
Treatment Time ◽  
Alloy Sheet ◽  
The Other ◽  
Particle Sizes ◽  
X Ray Diffraction ◽  
X Ray ◽  
Compressive Stresses

AbstractAn X-ray diffraction technique was used to measure residual stresses in Ti-6Al-4V and Ti-8Al-1Mo-1V sheet created by glass-bead peening, sand and aluminum oxide blasting, and a vibratory tumbling treatment. For peening and blasting, the use of larger particle sizes produced greater compressive stresses. In the case of the vibratory treatment, an increase in vibratory frequency or treatment time increased the compressive stress. Glass-bead peening caused a 10% reduction in yield strength while the other treatments had little effect on the tensile properties. Significant stress relaxation occurred in all the treated Ti-6Al-4V coupons exposed at 600° and 800°F.

Sign in / Sign up

Export Citation Format

Share Document