Sep 28, 2011 · Microstructural characterization reveals (i) intergranular corrosion at the cross section of tube wall, (ii) formation of severe chromium carbide network at the grain boundary, (iii) formation of sigma phases along the grain boundary as well as within the matrix, and (iv) generation of crack at the grain boundary filled with oxides. Analyses of these results suggest that formation of carbide network and sigma
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Cast iron is derived from pig iron, and while it usually refers to gray iron, it also identifies a large group of ferrous alloys which solidify with a eutectic. The colour of a fractured surface can be used to identify an alloy. White cast iron is named after its white surface when fractured, due to its carbide impurities which allow cracks to pass straight through.
Chromium in Steels IspatGuruOct 08, 2014 · Sigma phase embrittlement results from the precipitation of the iron-chromium compound after holding austenitic or ferritic stainless steels for long periods of time in the temperature range of 560 deg C to 980 deg C. Slow cooling from the temperature range of 1040 deg C to 1150 deg C produces the same effect, as does quenching from this range
ENVIRONMENTAL EMBRITTLEMENT OF DUCTILE IRONembrittlement resulting from changes generated by the interaction between the metal and its environment. These types of embrittlement are:hydrogen embrittlement, stress-corrosion cracking and liquid metal embrittlement. Environmental embrittlement of Ductile Iron is usually not a concern for designers. However, more attention
Gamburg, K.Z. and Rekoslavskaya, N.I. (1991) Formation and Functions of D-Amino Acids in Plants. Fisiologiya Rasteniy, 38, 1236-1246.
Hau, J., and Seijas, A., Sigma phase embrittlement of Hau, J., and Seijas, A., Sigma phase embrittlement of stainless steel in FCC service, CORROSION2006, paper 06578. has been cited by the following article:TITLE:Sigma Phase Formation and Embrittlement of Cast Iron-Chromium-Nickel (Fe-Cr-Ni) Alloys
Homogenization Heat Treatment to Reduce the Failure of Jan 18, 2012 · Sigma phase embrittlement. Several factors cause failure of heat resistant steel castings such as oxidation, sulfidation, carburization, creep, thermal fatigue, and sigma phase embrittlement. Intermetallics such as the sigma phase are important sources of failure in high-temperature materials.
Intermetallic phase embrittlement:Sigma phase. Intermetallic phases (Sigma phases) may form at temperatures between 500 and 900°C in ferritic stainless steels containing more than 14% Cr. Schaeffler diagram, area of intermetallic phase embrittlement. Intermetallic phase embrittlement:Sigma phase. Repair welding of cast iron components
aisi 321 - Steel Material SupplierMar 09, 2020 · These grades are all prone to sigma phase formation if uncovered for lengthy periods to a temperature of about 590 to 870°C. Sigma section embrittlement refers back to the formation of a precipitate within the steel microstructure over a protracted period of time within this particular temperature vary. Sigma Phase Formation and Embrittlement of Cast Iron Sigma Phase Formation and Embrittlement of Cast Iron-Chromium-Nickel (Fe-Cr-Ni) Alloys. HK alloy is a member of the heat resistant cast alloy family (H-Series) steels. They are widely used in the petrochemical industry for components requiring enhanced high temperature properties.