X-ray diffraction measurement of residual stress in WC-Co thermally sprayed coatings onto metal substrates

2012 ◽  
Vol 206 (23) ◽  
pp. 4725-4729 ◽  
Author(s):  
O.P. Oladijo ◽  
A.M. Venter ◽  
L.A. Cornish ◽  
N. Sacks
Keyword(s):  
Residual Stress ◽  
Diffraction Measurement ◽  
X Ray Diffraction ◽  
Metal Substrates ◽  
X Ray ◽  
Thermally Sprayed Coatings ◽  
Thermally Sprayed ◽  
Sprayed Coatings

Performance Thermally Sprayed Coatings Tests when Subject to Adhesive Wear

2014 ◽  
Vol 802 ◽  
pp. 349-352
Author(s):  
A.B.C. Arnt ◽  
M.R. da Rocha ◽  
G.F. Marangoni
Keyword(s):  
Room Temperature ◽  
Adhesive Wear ◽  
Wear Test ◽  
Test Time ◽  
X Ray Diffraction ◽  
X Ray ◽  
Thermally Sprayed Coatings ◽  
Oxygen Fuel ◽  
Thermally Sprayed ◽  
Sprayed Coatings

In this study it was evaluated the performance of coatings based on Cr3C2-25 (80Ni-20Cr) and CrC-30NiCr. The coatings were deposited by high velocity oxygen fuel (HVOF), with an average thickness of layer equal to 7.8μm. Samples were subjected to adhesive wear test (according ASTM G99) with a pin Ø 6 mm (SAE 52100). In the test was applied normal force equal to 50 N and tangential speed equal to 0.5 m/s. The test time was 30 minutes at room temperature, without lubrification. The wear surfaces were characterized by optical microscopy, scanning electron microscopy and X-ray diffraction. The microhardness of the coatings was also evaluated. The results showed that the coating based on Cr3C2-25(80Ni-20Cr) presented a performance ten times higher in wear resistance when compared to coating CrC-30NiCr.

Revision and extension of the standard laboratory technique for X-ray diffraction measurement of residual stress gradients

2007 ◽  
Vol 40 (4) ◽  
pp. 675-683 ◽  
Author(s):  
Cristy L. Azanza Ricardo ◽  
Mirco D'Incau ◽  
Paolo Scardi
Keyword(s):  
Residual Stress ◽  
Hole Drilling ◽  
Al Alloy ◽  
Diffraction Measurement ◽  
X Ray Diffraction ◽  
Surface Residual Stress ◽  
X Ray ◽  
Stress Gradients ◽  
Layer Removal ◽  
Removal Technique

A new procedure is proposed to determine sub-surface residual stress gradients by laboratory X-ray diffraction measurements at different depths using a chemical layer-removal technique. The standard correction algorithm for stress relaxation due to layer removal is improved by including corrections for X-ray absorption, and by the addition of constraints imposed by the mechanical equilibrium conditions. Besides correcting the data,i.e.providing more reliable through-thickness residual stress trends, the proposed procedure also provides an elastically compatible and plausible estimate of the residual stress inside the component, well beyond the measured region. The application of the model is illustrated for a set of Al-alloy components shot-peened at different Almen intensities. Results are compared with those given by `blind hole drilling', which is an independent and partly destructive method.

Computer Controlled X-Ray Diffraction Measurement of Residual Stress

1972 ◽  
Vol 16 ◽  
pp. 344-353 ◽  
Author(s):  
Carol J. Kelly ◽  
E. Eichen
Keyword(s):  
Residual Stress ◽  
Computer Control ◽  
Sample Surface ◽  
Diffraction Measurement ◽  
X Ray Diffraction ◽  
X Ray ◽  
Intensity Measurements ◽  
On Line ◽  
Computer Controlled ◽  
The Difference

AbstractThe system to be described includes hardware and software for the on-line computer control of the X-ray diffraction measurement of residual stress. This determination involves accurately measuring the angles at which a back-reflection line is diffracted, first by diffracting planes parallel to the sample surface, and then by planes at an angle (ψ) to the sample surface. The residual stress is calculated from the difference in the two measured diffraetion angles. The procedure executed by the computer consists of locating the peaks, selecting three angles for collection of X-ray counts, correcting the measured counts, fitting the equi-angular intensity measurements to a three-point parabola, calculating the peak angles, calculating the residual stress from the measured angles and typing a report. This automation has eliminated the tedium of the manual X-ray data accumulation and of the residual stress calculation. The online control has also permitted improvements in the technique not practicable with the manually performed measurement of residual stress.

X-Ray Diffraction Measurement of Residual Stresses in Thick, Multi-Pass Steel Weldments

1985 ◽  
Vol 107 (2) ◽  
pp. 185-191 ◽  
Author(s):  
C. O. Ruud ◽  
R. N. Pangborn ◽  
P. S. DiMascio ◽  
D. J. Snoha
Keyword(s):  
Residual Stress ◽  
Measurement Accuracy ◽  
Stress Measurement ◽  
Three Dimensional ◽  
Residual Stress Measurement ◽  
Stress Fields ◽  
Diffraction Measurement ◽  
X Ray Diffraction ◽  
X Ray ◽  
Removal Technique

A unique X-ray diffraction instrument for residual stress measurement has been developed that provides for speed, ease of measurement, accuracy, and economy of surface stress measurement. Application of this instrument with a material removal technique, e.g., electropolishing, has facilitated detailed, high resolution studies of three-dimensional stress fields. This paper describes the instrumentation and techniques applied to conduct the residual stress measurement and presents maps of the residual stress data obtained for the surfaces of a heavy 2 1/4 Cr 1 Mo steel plate weldment.

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