Use of Cr K-Beta X-Rays and Position Sensitive Detector for Residual Stress Measurement in Stainless Steel Pipe

1978 ◽  
Vol 22 ◽  
pp. 247-249 ◽  
Author(s):  
C. O. Ruud ◽  
C. S. Barrett
Keyword(s):  
Stainless Steel ◽  
Stress Measurement ◽  
Steel Pipe ◽  
X Rays ◽  
University Of Denver ◽  
Stainless Steel Pipe ◽  
Position Sensitive ◽  
The University ◽  
Research Institute

Residual stresses on the inner surface of stainless steel pipe used in nuclear reactors are of exceptional importance. Apparatus for measuring these in situ, in welded lengths of 10-inch diameter austenitic (304) stainless pipe has been developed at the University of Denver Research Institute under the sponsorship of the Electric Power Research Institute.

The Use of Mn-Kα X-Rays and a New Model of PSPC in Stress Analysis of Stainless Steel

1982 ◽  
Vol 26 ◽  
pp. 209-216 ◽  
Author(s):  
Yasuo Yoshioka ◽  
Ken-ichi Hasegawa ◽  
Koh-ichi Mochiki
Keyword(s):  
Stainless Steel ◽  
Stress Analysis ◽  
High Precision ◽  
Proportional Counter ◽  
Stress Measurement ◽  
X Rays ◽  
New Model ◽  
Major Disadvantage ◽  
Position Sensitive

The authors previously reported stress measurement in stainless steel by the use of monochromatic Cr-Kβ X-rays and a position sensitive proportional counter. Results indicated that a stress value can be obtained with high precision on account of the subtraction of background and the elimination of αFe(211) peak by Cr-Kα X-rays. The major disadvantage of this method, however, is that the intensity of Kβ X-rays monochromatized is essentially weak and it is complicated to eliminate Kα X-rays for practical use.

Stress Measurement in Stainless Steel by use of Monochromatic Cr-Kβ X-Rays and a Position Sensitive Detector

1980 ◽  
Vol 24 ◽  
pp. 167-172 ◽  
Author(s):  
Yasuo Yoshioka ◽  
Ken-ichi Hasegawa ◽  
Koh-ichi Mochiki
Keyword(s):  
Residual Stress ◽  
Stainless Steel ◽  
Stress Measurement ◽  
Diffraction Peak ◽  
X Rays ◽  
High Contrast ◽  
Sensitive Detector ◽  
X Ray ◽  
Position Sensitive ◽  
Martensite Structure

X-ray stress analysis in austenltic stainless steel is generally carried out on the ϒFe(311) diffraction line produced by Cr- Kβ X-rays. However, it is often pointed out that not much reliance can be placed on the precision of the stress because the contrast between a diffraction peak and its background is poor. In addition, to measure the stress is sometimes impossible on a specimen which has martensite structure produced by thes train induced transformation, because the ϒFe(211) line appears in the neighborhood of the desired ϒFe(311) line, since Cr-K6 X-rays accompany Cr-Ka from a conventional X-ray source. If Cr-Ka X-rays can be eliminated and only Cr-KB X-rays directed on the specimen, only the λe(311) line with high contrast will be obtained and one can expect to measure the residual stress with high precision.

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