Abstract
The feasibility of high-resolution strain mapping in bulk samples with both high-spatial and strain resolution is demonstrated using high-energy X-rays between 100 and 300keV on beam line ID15A at the ESRF. This was achieved by using a multiple-peak Pawley-type refinement on the recorded spectra. An asymmetric peak profile was necessary in order to obtain a point-to-point strain uncertainty of 10−5. The presented results have been validated with alternative methods, in this case FE model predictions. This technique promises to be a significant development in the in situ characterisation of strain fields around cracks in bulk engineering samples. The implication of slit size and grain size are discussed. This paper is a concise version of the work published in [A. Steuwer, J.R. Santisteban, M. Turski, P.J. Withers, T. Buslaps, J. Appl. Cryst. 37 (2004) 883].
Highlights
We report the results of strain mapping experiments on bulk engineering components with high spatial and strain resolution using energy-dispersive synchrotron X-ray diffraction (EDXRD) and full-profile analysis
Bulk in this context is taken to represent sample volumes that are usually considered inaccessible to X-rays. This method has been applied to the investigation of the residual strain fields in two typical engineering components where there are potentially great benefits to be gained, namely around a fatigue crack in a 25 mm thick austenitic stainless-steel compact tension (CT) specimen, and in a titanium linear-friction weld (LFW)
The combination of high flux and excellent beam definition offers the prospect of high spatial resolution with short counting times, opening up a whole new range of possible applications, ranging from basic materials engineering to dynamic in situ measurements
Summary
We report the results of strain mapping experiments on bulk engineering components with high spatial and strain resolution using energy-dispersive synchrotron X-ray diffraction (EDXRD) and full-profile analysis Bulk in this context is taken to represent sample volumes that are usually considered inaccessible to X-rays. This method has been applied to the investigation of the residual strain fields in two typical engineering components where there are potentially great benefits to be gained, namely around a fatigue crack in a 25 mm thick austenitic stainless-steel compact tension (CT) specimen, and in a titanium linear-friction weld (LFW). This limits the applicability somewhat to essentially two-dimensional problems (Brusch, 1998)
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