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• W20159906 abstract "Results obtaind in initial screening runs on sodium mass transfer are summarized for three steels. Where results depend upon bimetallic material combinations, the specific combination is indicated. The 2 1/2 Cr-1Mo steel decarburized at 1000 to 1200 deg F in both monometallic and in bimetallic 316SS-- 21/4 Cr-- 1 Mo systems. The decarburization process was found to increase with increasing oxygen levels in the sodium and by providing a carbon sink. Limited tensile data indicated that strength of the material significantly decreased with the loss of carbon. The shape of the carbides probably was significant since higher tensile strengths were encountered when the carbides were formed in a pearlite phase than when the carbides existed in spheroidized form. A reduction of approximately 30% in room temperature tonsile strength was indicated by the data. Carbide-stabillized 21/4 Cr-- 1 Mo alloys, 4S4 and 4S8 were approximately neutral to carbon transport in 700 hours in a bimetallic 316SS--21/4 Cr-- 1 Mo system. No serious localized effects were observed in this alloy group. For 5 Cr-- 1/2 Mo-- Ti steel intergranular penetration of corrosion products was observed in the 1000 to 1200 deg F temperature regions to a maximum depth of 0.001-inch in approximatelymore » 2800 hours. The layer where the phenomenon occurred was found to be chromium depleted. This penetration can result in lower strength properties particularly in the case of components with stress-concentration. Depths of penetration were minor but longer times than 2800 hr af low sodium velocities might enhance the effect and cause signiicant reductions in stress- rupture strength and hasten inter-crystalline cracking. The alloy was approximately neutral to carbon transport, beta in a monometallic and in a bimetallic 316SS-- 5 Cr- 1.2 Mo- Ti system. The 316 stainlees steel was approximately neutral to carbon transport in a monometallic system, but carburized in a bimetallic 316SS-2 1/4 Cr-1 Mo system. The degree of carburization was limited by the apparent inability of 316 stainless steel to accept carbon as readily as the ferritic alloy lost carbon. An increase in carbon content slightly in excess of twice the as-received value of 0.045% was observed. This can be expected to cause some increase in mechanical properties, and ten sile and yield strength. The effects of microstructare of carbon increase were not completely evaluated; however, in areas of worked structure heavier carbide cases and precipitation of carbides along preferred crystallographic planes, termed Widmanstatten structure, were observed. These effects indicate possible susceptibility to local embrittlement. An austenitic- to-ferritic transformation occurred at the suriace at temperatures of 1100 to 1300 deg F. This transformation was observed to begin in 700 hours and was enhanced in regions of deformed structure. A surface structure anomaly was also observed at 1000 deg F in 700 hours which may be the initiation of the transformation. Chromium depletion was observed adjacent to the surface in the area where these effects took place. (auth)« less" @default.
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• W20159906 title "SODIUM MASS TRANSFER. II. SCREENING TEST DATA AND ANALYSIS. VOLUME 2. METALLURGY" @default.
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