Showing papers on "Pearlite published in 1968"
TL;DR: In this article, the edgewise growth rate of pearlite into austenite has been computed on the assumptions that interface diffusion is the dominant means of carbon transport and that local equilibrium exists across all interfaces.
99 citations
TL;DR: In this article, a study of the spheroidization of eutectoid steel at 700°C under conditions of lengthy annealing, cold working at room temperature, hot torsion, and hot fatigue was made.
Abstract: A study has been made of the spheroidization of pearlite in eutectoid steel at 700° C under conditions of lengthy annealing, cold working at room temperature followed by annealing, hot torsion, and hot fatigue. The results show that hot torsion accelerates spheroidization by a factor of ∼ 104 compared with annealing but that acceleration by a factor of ∼ 100 is obtained both with cold work followed by annealing and with hot fatigue. It is suggested that the acceleration results from enhanced diffusion of iron in the ferrite due to the introduction of large-angle sub-boundaries by dynamic recovery.
61 citations
Patent•
28 Aug 1968
TL;DR: In this paper, the authors present a comparison of STEEL ARTICLE, SUCH AS PLATE, HAVING a RELATIVELY high YIELD STRENGTH, E.G. 70,000 P.S.
Abstract: STEEL ARTICLE, SUCH AS PLATE, HAVING A RELATIVELY HIGH YIELD STRENGTH, E.G. 70,000 P.S.I., TOGETHER WITH A RELATIVELY HIGH IMPACT RESISTANCE, E.G. 15 FOOT-POUND CHARPY V-NOTCH IMPACT TRANSITION TEMPERATURE IN THE RANGE -50* TO -100*F. OR LOWER. MICROSTRUCTURE IS FERRITE PLUS PEARLITE. FERRITIC GRAIN SIZE IS 9.5 ASTM OR FINER. COMPOSITION, IN WT. PERCENT: CARBON 0.02-0.26 MANGANESE 1.25-1.75 SILICON 0.75-1.5 NITROGEN 0.003-0.015 ALUMINUM 0.01-0.08 VANADIUM 0-0.07 COLUMBIUM 0-0.03 TUNGSTEN 0-0.1 ARTICLE IS HOT ROLLED WITH AT LEAST 25% DEFORMATION AT FINISHING TEMPERATURE ABOVE A1 TO GIVE MICROSTRUCTURE CONTAINING FINE GRAINED AUSTENITE (9.5 ASTM OR FINER). COOLING IS RAPID BUT CONTROLLED TO AVOID LOW TEMPERATURE TRANSFORMATION PRODUCTS IN MICROSTRUCTURE. NORMALIZING OPTIONAL.
8 citations
TL;DR: When the carbon content in aluminum cast iron is reduced (to about 2.5%), carbon is concentrated near the dendritic branches where a specific variety of "pearlite" is formed, the interdendritic regions remaining ferritic as discussed by the authors.
Abstract: When the carbon content in aluminum cast iron containing about 2.5% Al is reduced (to about 2.5%),. carbon is concentrated near the dendritic branches where a specific variety of “pearlite” (containing a finely dispersed carbon-rich γ′-phase) is formed, the interdendritic regions remaining ferritic. Modifying cast irons of this kind with cerium leads not only to spherodization of graphite but also to the formation of γ′-phase dendrites with a corresponding reduction in the carbon content in the ferritic matrix surrounding γ′-phase dendrites and “pearlite.” This has a beneficial effect on the wear resistance of cast iron.
6 citations
4 citations
1 citations