Hostname: page-component-6d856f89d9-8l2sj Total loading time: 0 Render date: 2024-07-16T07:12:16.638Z Has data issue: false hasContentIssue false
  • English
  • Français

The Determination of Carbide Types in Thin-Film Specimens of Low Alloy Steels.

Published online by Cambridge University Press:  02 July 2020

A.J. Papworth ,
M. Watanabe  and
D.B. Williams
A.J. Papworth
Affiliation:
Materials Research Center, Lehigh University, Bethlehem, Pennsylvania18015-3195, USA.
M. Watanabe
Affiliation:
High Voltage Electron Microscopy, Kyushu University, Fukuoka812-8581, Japan.
D.B. Williams
Affiliation:
Materials Research Center, Lehigh University, Bethlehem, Pennsylvania18015-3195, USA.
Get access

Extract

The introduction of “clean steels” was thought to have cured the problem of temper embrittlement in low alloy steels. However, even these steels exhibit temper embrittlement at services temperature above 400°C. Initial studies of temper embrittlement of clean steels used Auger electron spectrometry of fracture surfaces. The failure was found to occur along the prior austenite grain boundaries (PAGBs) where P segregation was found. It has been reported that the concentration of segregants changes along individual PAGB facets, as well as between the facets of different PAGBs. It was proposed that different elements segregate to different PAGBs, depending on their orientation. Differences in segregation along individual PAGBs were attributed to precipitation during thermal exposure, as identified by AEM. The cause of temper embrittlement is still unknown, as there are doubts about the role of precipitation. This implies that each PAGB may have a different chemistry.

Type
Phase Transformations
Information
Microscopy and Microanalysis , Volume 6 , Issue S2: Proceedings: Microscopy & Microanalysis 2000, Microscopy Society of America 58th Annual Meeting, Microbeam Analysis Society 34th Annual Meeting, Microscopical Society of Canada/Societe de Microscopie de Canada 27th Annual Meeting, Philadelphia, Pennsylvania August 13-17, 2000 , August 2000 , pp. 348 - 349
Copyright
Copyright © Microscopy Society of America

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

1.Zabil’skii, V.V.. Metal Science and Heat Treatment, 29. (1) 1987 32.CrossRefGoogle Scholar
2.Weng, Y. et al., Mat. Sci. Tech. 3 1987 207.Google Scholar
3.Bandyopadhyay, N. et al., Met. Trans. A 16A 1985 721.CrossRefGoogle Scholar
4.Suzuki, S. et al., Scripta. Metall. 15, 1981 1139.CrossRefGoogle Scholar
5.Menyhard, M. et al., Acta. Met. Mater. 39 (6) 1991 1289.CrossRefGoogle Scholar
6.Briant, C.L., Acta. Metall. 31 (2) 1983 257.CrossRefGoogle Scholar
7.Papworth, A.J. et al., MRS Fall 1999 conference.Google Scholar