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confused with commercially available INCOLOY alloy MA 956 in which pre-existing ultra-fine particles of yttrium oxide are mechanically alloyed into the alloy matrix during manufacture. In the latter case, metallic yttrium is not available for subsequent oxide formation. A more closely related article describing alumina scale formation in INCOLOY alloy MA 956 prepared by mechanical alloying and not subsequently melted has been written by Ramanarayanan et al. ~ "Pegging" of the alumina protective oxide film on this alloy has been observed by Macdonald3 following exposure for 500 hours at 1300 ~ but the pegs were identified as titanium-rich, probably carbonitrides, and not yttrium oxide enriched. Detailed information including data sheets, articles, and technical papers is available on mechanically alloyed oxide dispersion strengthened superalloys such as INCOLOY* alloy MA 956, INCONEL* alloy MA 754, and INCONEL alloy MA 6000. These alloys, together with the mechanical alloying process, were developed by Inco, and, as alloy manufacturers, Inco Alloys International at Hereford, United Kingdom and Huntington, WV, we would be pleased to respond to further inquiries. REFERENCES 1. E A. Golightly, F.H. Stott, and G. C. Wood: Oxidation of Metals, 1976, vol. 10, pp. 163-87. 2. T.A. Ramanarayanan, M. Raghavan, and R. Petkovic-Luton: Jour. Electrochem. Soc., 1981, vol. 131, no. 4, pp. 923-31. 3. D.M. Macdonald: Frontiers of High Temperature Materials Conf., 1981, London, Publ. IncoMAP.
Authors' Reply QIYONG HAN, CHENGZHANG HUO, WEIZHEN ZHONG, and MING PENG Mr. Hack's comments are right. The INCOLOY alloy MA 956 mentioned in our paper actually is an FeCrA1 cast alloy. It is produced in China with the addition of Mischmetal. In the original manuscript, we called it FeCrA1 alloy which is the Chinese alloy grade.
Nature of the y and y* Phases in Austenitic Stainless Steels Cathodically Charged with Hydrogen P. ROZENAK and D. ELIEZER Hydrogen induced martensite phase transformation in austenite stainless steels has been extensively studied with respect to the relative stability of the austenitic phase. The
*INCOLOY and INCONEL are trademarks of the INCO family of companies.
*QIYONG HAN, CHENGZHANG HUO, WEIZHEN ZHONG, and MING PENG: Metall. Trans. A, 1987, vol. 18A, pp. 499-507. G. A. J. HACK is Industry Manager, Inco Alloys International, Holmer Road, Hereford HR4 9SL, United Kingdom. Discussion submitted September 16, 1987. METALLURGICALTRANSACTIONS A
E ROZENAK, formerly with the Materials Engineering Department, Ben-Gurion University of the Negev, Beer-Sheva, is with the Department of Materials Science, University of Illinois at Urbana-Champaign, 1304 West Green Street, Urbana, IL 61801. D. ELIEZER is Professor of Metallurgical Engineering, Department of Materials Engineering, Ben-Gurion University of the Negev, Beer-Sheva, Israel. Manuscript submitted October 6, 1986. VOLUME 19A, MARCH 1988--723
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