. Transactions. ow the same speci-mens at higher magnifications. It is evident that during the earlierstages of anneal, the only visible changes taking place are the coarseningof the pearlite lamellae and perhaps a slight spheroidizing of the pro-eutectoid cementite, as shown by Figs. 28, 29, 37, and 38. Tempercarbon was first positively identified in the specimen quenched after12 hr. annealing (Fig. 31). The presence of temper carbon in thespecimen quenched after 8 hr. annealing is extremely doubtful (Fig. 30). In these, and other observations made by us, the temper carbon inquenched specimen
. Transactions. ow the same speci-mens at higher magnifications. It is evident that during the earlierstages of anneal, the only visible changes taking place are the coarseningof the pearlite lamellae and perhaps a slight spheroidizing of the pro-eutectoid cementite, as shown by Figs. 28, 29, 37, and 38. Tempercarbon was first positively identified in the specimen quenched after12 hr. annealing (Fig. 31). The presence of temper carbon in thespecimen quenched after 8 hr. annealing is extremely doubtful (Fig. 30). In these, and other observations made by us, the temper carbon inquenched specimens seems to be coincident with the appearance oftroostite or martensite. This would seem to signify that no appreciableamount of temper carbon is precipitated until a saturated solution is * O. W. Storey: Researches in Annealing Process for Malleable Castings. Foundrymens .\ssn. (1914) 23, 460. ^ Loc. cit. 1 Merica and Gurevich: Graphitization of \Miite Cast Iron upon (1920) 62, MALLEABLEIZING OF WHITE CAST IRON
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Keywords: ., bo, bookcentury1800, bookdecade1870, booksubjectmineralindustries
