The Iron and steel magazine . Fig. i . 1 Defective Bar o) Tool Steel 283 Fig; 5 shows the structure (x6o) of the fine grained frad In this we tii>tice a slighl ne1 work. Here, then, we find structures correspondingly as differenlas the two fractures. An attempl was made by treating thetwo pieces of steel represented in the two structures to sec itthey could not be duplicated. Fig. 6 shows the structure (x6o) of a piece of the fine-grained steel after being heated to 17000 F. and cooled in lime. Pig. 7 shows the structure (x6o) of the coarse grain treatedexactly the same. Com]tare these two
The Iron and steel magazine . Fig. i . 1 Defective Bar o) Tool Steel 283 Fig; 5 shows the structure (x6o) of the fine grained frad In this we tii>tice a slighl ne1 work. Here, then, we find structures correspondingly as differenlas the two fractures. An attempl was made by treating thetwo pieces of steel represented in the two structures to sec itthey could not be duplicated. Fig. 6 shows the structure (x6o) of a piece of the fine-grained steel after being heated to 17000 F. and cooled in lime. Pig. 7 shows the structure (x6o) of the coarse grain treatedexactly the same. Com]tare these two structures with that. 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
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Keywords: ., bookcentury1800, bookdecade1890, bookidironsteel, booksubjectiron
