The Iron and steel magazine . Fig. shown in Fig. 3. There is more of a tendency to form a network,yet the crystallization is nearly the same. The cementite needles are coarse and irregular. If any-thing, it would seem as if the original coarse grain cooled moreslowly and from a higher temperature than 17000 F. Fig. 8 shows the structure (x6o) of the fine grain heatedto 17000 F. and cooled in the air. Here all the cementite seemsto have gone to the needle form and is so pronounced that thepearlite loses its significance. Fig. 9 shows the structure (x6o) of the coarse grain heatedto 13500 F. and
The Iron and steel magazine . Fig. shown in Fig. 3. There is more of a tendency to form a network,yet the crystallization is nearly the same. The cementite needles are coarse and irregular. If any-thing, it would seem as if the original coarse grain cooled moreslowly and from a higher temperature than 17000 F. Fig. 8 shows the structure (x6o) of the fine grain heatedto 17000 F. and cooled in the air. Here all the cementite seemsto have gone to the needle form and is so pronounced that thepearlite loses its significance. Fig. 9 shows the structure (x6o) of the coarse grain heatedto 13500 F. and cooled in the air. Here we see a fine-grainedstructure of a properly annealed steel. 284 The Iron and Steel Magazine. Fig. 3 Fig. 4
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Keywords: ., bookcentury1800, bookdecade1890, bookidironsteel, booksubjectiron
