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Journal of Electron Microscopy 51:S127-S134 (2002)
© 2002 Oxford University Press

Full-length paper

Application of a JEM-2010FEF FEG-AEM for elemental analysis of microstructures in heat-resisting Cr steel

Hiroki Tanaka1, Akiko Sadakata1, Masashi Watanabe2,4, Yoshitsugu Tomokiyo1,*, Nobuhiko Nishimura3 and Masashi Ozaki3

1Department Material Sciences and Engineering and
2Research Laboratory for High Voltage Electron Microscopy, Kyushu University, Fukuoka 812-8581, Japan and
3Nagasaki R&D Center, Mitsubishi Heavy Industries, Ltd., Nagasaki 851-0392, Japan and
4Present address: Department of Material Science and Engineering, Lehigh University, Bethlehem, PA 18015-3195, USA

To whom correspondence should be addressed. E-mail: tomokiyo{at}zaiko.kyushu-u.ac.jp

When the heat-resisting Cr alloy steels are welded and annealed for stress relief (SR), the temper embrittlement takes place in the heat-affected zones, usually around the prior austenite garin-boundaries (PAGBs). To investigate the SR embrittlements in the heat-resisting Cr-alloy steels, a field-emission transmission electron microscope (FEG-AEM) JEM-2010FEF has been used. In this study, two types of grain boundaries have been analysed by X-ray energy dispersive spectrometry and electron energy filtering: one is the PAGB, another one is the martensite-lath grain boundary (MLGB). To analyse such grain boundaries quantitatively using the FEG-AEM, the microscope conditions have been optimized for X-ray microanalysis theoretically and the Cliff-Lorimer k factors with respect to Fe have been determined experimentally. From structural observation and XEDS analysis around the grain boundaries, several carbides were found around the PAGBs, which may have caused the SR embrittlements in the Cr-alloy steels.

Keywords     probe-size optimization, quantitative X-ray microanalysis, k factor determination, energy-filter, core-loss elemental mapping, grain-boundary segregation


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