|Series||ASTM special technical publication -- 110|
|Contributions||American Society for Testing Materials., American Society for Testing Materials. Annual meeting,|
Symposium on the Nature, Occurrence, and Effects of Sigma Phase. Pages: Published: Sigma Phase and Other Effects of Prolonged Heating at Elevated Temperatures on 25 per cent Chromium — 20 per cent Nickel Steel. The Occurrence of the Sigma Phase and Its Effect on Certain Properties of Cast Fe-Ni-Cr Alloys. Sigma phase is commonly considered to be the most deleterious secondary phase precipitating in duplex stainless steels, as it results in an extreme reduction of corrosion resistance and toughness. Previous studies have mainly focused on the kinetics of sigma phase precipitation and influences on properties and only a few works have studied the morphology of sigma phase and its influences on Cited by: R.P. Anantatmula / Occurrence and prediction of sigma phase 5. Conclusions Solid-solution strengthened austenitic steels, and , form sigma upon thermal aging in high temperature sodium. The sigma phase is primarily restricted to the austenitic region underneath the depleted by: 5. Abstract. Abstract. The sigma phase, which occurs in transition-metal alloy systems, is of interest in both the technological and the theoretical field of alloy formation. In the former, the sigma phase is important because of its occurrence, with generally deleterious effects, in stainless and other high-alloy steels, while in the latter case a knowledge of the properties of the phase may lead to a greater .
and produce sigma phase, which has,ome deleterious effects on the proper ties of the cladding. Sigma phase is a hard and brittle inter metallic compound, consisting mainly of Fe and Cr in stainless steels. Sigma phase and its properties have been reviewed by Hall and Algie (Ref. 4). Sigma phase pre cipitates more easily in delta ferrite than. G. N. Emmanuel: Sigma Phase and Other Effects of Prolonged Heating at Elevated Temperatures on 25 pct Cr pct Ni Steel. Symposium on Nature, Occurrence, and Effects of Sigma Phase. ASTM Bulletin () pp. 82– Google Scholar. 8 P. Duwez and S. R. Baen, "X-Ray Study of the Sigma Phase in Various Alloy Systems," Symposium on the Nature, Occurrence, and Effects of the Sigma Phase, Spec. Tech. Pub. No. , Am. Soc. Testing Materials, Philadelphia, pp. , The temperatures at which the alpha-to-beta and the beta-to-gamma transformations take place have been. The most rapid sigma-phase formation occurs in the range of °C (°F). Alloy elements such as molybdenum, titanium and silicon promote the formation of sigma phase, while nitrogen and carbon reduce its tendency to form. Sigma phase is an intermetallic compound consisting of chromium and iron, which is hard, brittle and non-magnetic.
The meeting invites Sigma Xi members and the public to attend online sessions, workshops, and panel discussions. The Student Research Conference includes access to the research symposia plus virtual poster and oral presentation competitions for high school, undergraduate, and graduate students. Allotropic transformation in uranium has been studied over a range of cooling rates from 5 to about °C/sec. The transformation temperatures of both gamma‐to‐beta and beta‐to‐alpha were found to. P. Duwez and S. R. Baen:Symposium on the Nature, Occurrence, and Effects of Sigma Phase, ASTM Special Technical Publication No. , ,pp. K. W. Andrews, D. J. Dyson, and S. R. Keown: Interpretation of Electron Diffraction Patterns, Hilger and Watts, , p. This article focusing on analyse phase of this study where the cause and effect diagram, failure mode and effect analysis and pareto chart were used to determine the major causes of the problem.