Creep damage quantification of 2.25Cr–1Mo steel using scanning electron microscopy

Authors: Collington, R.A.¹; Cawley, J.¹; Holdsworth, S.R.²

Source: Materials Science and Technology, Volume 16, Number 10, October 2000 , pp. 1214-1220(7)

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Abstract:

The material 2.25Cr–1Mo alloy steel has been used extensively for high temperature applications in power generation plant for over five decades owing to its long term creep resistance. It has been recognised that the lifetime of a high temperature component containing pre-existing defects is dependent not only upon the material's crack propagation resistance but also upon an incubation period before crack growth during which a damage zone ahead of the defect tip develops. The extent of the damage occurring during this incubation period, before crack propagation, is dependent upon the stress intensity at the defect tip, the ductility of the material, and the microstructure in the damage zone. The present paper details a technique for quantifying the early stages of creep damage using image analysis in the scanning electron microscope, and compares the degree, distribution, and orientation of creep damage occurring in two microstructural variables of 2.25Cr–1Mo alloy steel. The paper describes the procedures necessary for generating consistent and reproducible quantitative analysis results, including specimen preparation, defect detection, and measurement criteria. The image analysis process, its accuracy, and application to the study of creep damage mechanisms occurring ahead of defects are discussed.

Document Type: Regular Paper

DOI: http://dx.doi.org/10.1179/026708300101506975

Affiliations: 1: Materials Research Institute, Sheffield Hallam University, Sheffield, UK 2: Alstom Power, Rugby, Warwickshire, UK

Publication date: 2000-10-01

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Creep damage quantification of 2.25Cr–1Mo steel using scanning electron microscopy

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