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Segregation Measurements in Ferritic Steels Using AES and EDX

Published online by Cambridge University Press:  02 July 2020

I A Vatter  and
J.M. Titchmarsh
I A Vatter
Affiliation:
Materials Performance Dept, AEA Technology, B220 Harwell Laboratory, Didcot, Oxon OXll 0RA, UK
J.M. Titchmarsh
Affiliation:
Materials Research Institute, Sheffield Hallam University, Pond Street, SheffieldSI 1WB, UK
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Extract

A quantitative comparison has been made of intergranular segregation in four 9%-Cr ferritic steel alloys, S1-S4 doped, respectively, with 560, 300, 120 and 25ppm P, by both Auger Electron Spectroscopy (AES) and EDX in the analytical electron microscope (FEG-STEM). The strengths, weaknesses, relative accuracies and precision of the two methods were investigated in view of the different equipment, sample preparation, characteristic signals and unrelated assumptions in quantifying the results. No such investigation of ferritic steels has previously been reported, even though they are widely used in engineering components and can be susceptible to embrittlement. Comparative studies have been reported for austenitic alloys.

The steels were solution-treated, tempered at 750°C and aged at 500°C for 100 hours. In-situ impact at low temperature in the VG MA500 AES apparatus caused mixed cleavage and intergranular fracture, the latter increasing with P content. Spectra from up to 80 individual intergranular facets were recorded from each alloy using a 5nA-10KeV beam from an LaB6 electron source under conditions which had been optimised by prior investigation.

Type
Segregation and Diffusion Analysis in Materials
Information
Microscopy and Microanalysis , Volume 3 , Issue S2: Proceedings: Microscopy & Microanalysis '97, Microscopy Society of America 55th Annual Meeting, Microbeam Analysis Society 31st Annual Meeting, Histochemical Society 48th Annual Meeting, Cleveland, Ohio, August 10-14, 1997 , August 1997 , pp. 541 - 542
Copyright
Copyright © Microscopy Society of America 1997

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