Feasibility Study on Application of Synchrotron Radiation μCT Imaging to Alloy Steel for Non-Destructive Inspection of Inclusions

Abstract

In order to examine the feasibility of applying synchrotron radiation μCT imaging to alloy steels for non-destructive inspection of inclusions for potential origins of internal fatigue damage in the very high cycle region, synchrotron radiation μCT imaging was utilized for repeated non-destructive observation of Cr-Mo steel. An ultrasonic fatigue testing machine was used in aid of the repeated observation. As a result, it was found that the synchrotron radiation μCT imaging with 70 keV was useful for non-destructive observation of inclusions of more than 10 μm, one of which may be an internal fatigue origin. No identifiable damage was observed around every inclusion, and in the base metal, at least up to 70% of fatigue life was observed in the imaging volume.

Fatigue fracture and probabilistic assessments of a cone and pipe welded structure of stainless steels

“…Since the coefficient of variation C V for K t and K a was close to each other, the stress concentration factor corresponding to the weld opening angles at the C i portion was suggestively the main influence factor on their strengths and scatters. [25][26][27][28][29][30] The influences of irregular shapes including weld toe radii and metal structures were represented by η a , which also caused the variations of strengths and scatters.…”

Fracture, Fatigue, and Structural Integrity of Metallic Materials

“…The final contribution [12] is a communication that examines the feasibility of applying synchrotron radiation µCT imaging for non-destructive inspection of inclusions in alloy steels.…”