X-Ray stress measurement on steels having preferred-orientation

Dölle, Heiner; Hauk, Viktor; Kockelmann, H.; Sesemann, Horst

doi:10.1243/03093247v121062

Cited by 17 publications

(6 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…PM stress is proportional to the amount of plastic deformation, and linearly increases up to 0.5% carbon content (Taira et al, 1974). Fe 211 shows lower stress values than Fe 310 owing to the texture development, even when DECs are used (Dolle & Hauk, 1977;Taira et al, 1974). Our independent X-ray measurement comparing measured stresses between 1018 carbon steel (C: 0.14-0.20 wt%) and 1010 carbon steel (C: 0.08-0.13 wt%) reveals that 1018 steel with more carbon content shows 5-25% higher stress values than 1010 steel at 25 0 45 , which may indicate the presence of PM stresses.…”

Section: Uncertainty From Pseudo-macrostressmentioning

confidence: 99%

Precision and accuracy of stress measurement with a portable X-ray machine using an area detector

et al. 2017

View full text Add to dashboard Cite

The use of portable X-ray stress analyzers, which utilize an area detector along with the newly adopted 'cosα' or full-ring fitting method, has recently attracted increasing interest. In laboratory conditions, these measurements are fast, convenient and precise because they employ a single-exposure technique that does not require sample rotation. In addition, the effects of grain size and orientation can be evaluated from the Debye ring recorded on the area detector prior to data analysis. The accuracy of the measured stress, however, has been questioned because in most cases just a single reflection is analyzed and the sample-to-detector distances are relatively short. This article presents a comprehensive analysis of the uncertainty associated with a state-of-the-art commercial portable X-ray device. Annealed ferrite reference powders were used to quantify the instrument precision, and the accuracy of the stress measurement was tested by in situ tensile loading on 1018 carbon steel and 6061 aluminium alloy bar samples. The results show that the precision and accuracy are sensitive to the instrument (or sample) tilt angle (ψ0) as well as to the selected hkl reflection of the sample. The instrument, sample and data analysis methods all affect the overall uncertainty, and each contribution is described for this specific portable X-ray system. Finally, on the basis of the conclusions reached, desirable measurement/analysis protocols for accurate stress assessments are also presented

show abstract

Section: Uncertainty From Pseudo-macrostressmentioning

confidence: 99%

Precision and accuracy of stress measurement with a portable X-ray machine using an area detector

et al. 2017

View full text Add to dashboard Cite

show abstract

“…5.2b). This effect is termed "tp-splitting" [1,2,3]. Data exhibiting "regular" behavior can thus be analyzed by methods based on Eq.…”

Section: Fundamental Equations Of X-ray Strain Determinationmentioning

confidence: 99%

Determination of Strain and Stress Fields by Diffraction Methods

1987

View full text Add to dashboard Cite

show abstract

“…The marquenched specimens showed little variation fiom the moderately deformed line contact ausrolled specimens in either the hoop stress or axial stress calculations. However, the heavily deformed point contact ausrolled specimens exhibited consistently higher compressive stresses than either the marquenched or line contact Figure 4 Residual Axial Stress Profiles ausrolled specimens up to a depth of approximately 1600 microns. At the surface of the specimen, the point contact specimen showed approximately five times the residual compressive stress of the marquenched specimen, w i t h a 400 MPa difference between the two specimens.…”

Section: Resultsmentioning

confidence: 97%

Residual stress depth profiles of ausrolled 9310 gear steel

Paliani¹,

Queeney

Kozaczek

1995

View full text Add to dashboard Cite

S,T IResidual Stress analysis utilizing x-ray diffraction in conjunction with material removal by chemical polishing provides a very effective method of analyzing the near surface residual stress profile of steels. In this experiment, residual stress profiling has been used to analyze the effects of surface ausrolling during the marquenching of a 9310 gear steel which has been carburized to 1% carbon. The ausrolling process is an advanced thermomechanical processing technique used to ausform only the critical surface layer of gears and produce a hard, tough, fine-grained martensitic product. This study compares the residual stress profile of a marquenched specimen with a moderately deformed ausrolled specimen and with a heavily deformed ausrolled specimen, in order to correlate the effects of residual stress with the improved fatigue properties of the gear steel. While no significant variation was observed between the residual stress profile of the marquenched specimens (no deformation) and the line contact ausrolled specimens (moderate deformation), significant increases in the amount of compressive residual stress was noted in the residual stress profile of the point contact ausrolled (heavily deformed) samples. The maximum increase in compressive residual stress due to point contact ausrolling was approximately 500 m a , when compared to the marquenched sample. This increased residual compressive stress will lower the effective shear stresses during rolling contact fatigue and would therefore explain some of the increase the rolling contact fatigue endurance of the point contact ausrolled specimens.

show abstract

X-Ray stress measurement on steels having preferred-orientation

Cited by 17 publications

References 6 publications

Precision and accuracy of stress measurement with a portable X-ray machine using an area detector

Precision and accuracy of stress measurement with a portable X-ray machine using an area detector

Determination of Strain and Stress Fields by Diffraction Methods

Residual stress depth profiles of ausrolled 9310 gear steel

Contact Info

Product

Resources

About