Canadian engineer . KHi. 7. Brittle nickel-steel tIate showing struc-ture due to sudden coolin^^. Magnif\t-atiori, mi tiiaiiieters. Kill. S. ? KracLured locomotive axle, with lar^e-^raiti stniolurpahowinjf elonjrated ^lai^ en«-lo8ure8 in ferrite ltouiuI ntass(high Iower). Ftci. 1. Flo. 10. - Cpo88-8ection of fase-hardened raotor-(;ar8teeri«tf-rofl. niat^iiirication. Fif*. Sample <»i .-ast iron in \vhi< h I he oarhon hadseparated in lar^e tlaUew. ^-i^.,. -j,^. The micrograph reproduced in Fig. 3 was taken froma mild steel plate -which fractured very b
Canadian engineer . KHi. 7. Brittle nickel-steel tIate showing struc-ture due to sudden coolin^^. Magnif\t-atiori, mi tiiaiiieters. Kill. S. ? KracLured locomotive axle, with lar^e-^raiti stniolurpahowinjf elonjrated ^lai^ en«-lo8ure8 in ferrite ltouiuI ntass(high Iower). Ftci. 1. Flo. 10. - Cpo88-8ection of fase-hardened raotor-(;ar8teeri«tf-rofl. niat^iiirication. Fif*. Sample <»i .-ast iron in \vhi< h I he oarhon hadseparated in lar^e tlaUew. ^-i^.,. -j,^. The micrograph reproduced in Fig. 3 was taken froma mild steel plate -which fractured very badly on bending,although the test-piece had come up to specification structure shows a very elongated and irregular arrange-ment of the pearlite through the ferrite gfround-mass, indi-catino- that the metal had been finished at too hig-h a tem-perature, and either not afterwards annealed, or annealedat too hi-j-h a temperature. In addition to the brittle effect gated bands of ferrite, free from carbon, and knownas ghosts, in which has been entangfled quite aconsiderable amount of slag. This is seen to be grey in shade and quite distinct from the irregular pearliteareas, which under a higher power were seen to be welllaminated (inci ^ that the metal had been left to coolslowly from a-i
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Keywords: ., bookcentury1800, bookdecade1890, bookpublishertoron, bookyear1893
