Precipitation Evolution in HT-9 Steel Under Thermal Aging and Stress Rupture Conditions / R-N Pai, RC. Wilcox
- Conference Author:
- Effects of Radiation on Materials: 15th International Symposium (15th : 1990 : Nashville, Tennessee)
- Physical Description:
- 1 online resource (16 pages) : illustrations, figures, tables
- Additional Creators:
- Pai, R-N, Wilcox, RC., American Society for Testing and Materials, and ASTM International
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- Precipitate development in two heats of HT-9 steels (84425 and 91354) during stressed and stress-free thermal aging treatments was studied. Stress-free thermal aging was conducted from 923 to 1033¿̐ưK for 500 to 10 000 h while stress rupture conditions of 10.4 to 337 MPa stress at 811 to 1033¿̐ưK for 60 to 17 754.8 h were utilized. Microdiffraction and energy dispersive X-ray spectroscopy techniques were used to analyze the precipitates. The carbide, M23C6, was the predominate precipitate phase in all conditions, with the exception of stressed specimens tested at 1033¿̐ưK, where most of the M23C6 was replaced by chromium nitride (Cr2N). Cr2N was found only in stressed specimens at and above 977¿̐ưK. The presence of Laves phase below 977¿̐ưK produced a compositional variation in chromium in M23C6 and in the metal carbide phases of the MX type. Sigma phase was found only after long time testing at 811¿̐ưK at a high stress level. The MX phases generally were found in both heats under all conditions. These phases were vanadium-rich in the stress rupture specimens, while titanium-rich in some of the stress-free thermally aged specimens.
- Dates of Publication and/or Sequential Designation:
- Volume 1992, Issue 1125 (January 1992)
- 9780803151871 (e-ISBN), 9780803114777, and 080311477X
- Digital File Characteristics:
- text file PDF
- Bibliography Note:
- Includes bibliographical references 28.
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- Also available online via the World Wide Web. Tables of contents and abstracts freely available; full-text articles available by subscription., Full text article also available for purchase., and Also available in PDF edition.
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- Electronic reproduction. W. Conshohocken, Pa. : ASTM International, 1992. Mode of access: World Wide Web. System requirements: Web browser. Access may be restricted to users at subscribing institutions.
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- Mode of access: World Wide Web.
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- ASTM International PDF Purchase price USD25.
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