The Iron and steel magazine . ortnight the powders were brokenoff, and the liquids well stirred. After seventeen days the re-action had practically ceased among the early members. Thebars were then taken out, washed, dried at 1200 C. (2480 F.), Iron Nickel-Manganese Carbon Alloy, i i i cooled in a desiccator and weighed. The losses in weighl rangedfrom about .21 to .88 grams. The percentage losses vary be-tween (B) and .28 (J and EC). Except for a rather high corrosion figure for B, the valuesdecrease fairly uniformly withascending nickel. The irregu-larity at B will have been noticed in
The Iron and steel magazine . ortnight the powders were brokenoff, and the liquids well stirred. After seventeen days the re-action had practically ceased among the early members. Thebars were then taken out, washed, dried at 1200 C. (2480 F.), Iron Nickel-Manganese Carbon Alloy, i i i cooled in a desiccator and weighed. The losses in weighl rangedfrom about .21 to .88 grams. The percentage losses vary be-tween (B) and .28 (J and EC). Except for a rather high corrosion figure for B, the valuesdecrease fairly uniformly withascending nickel. The irregu-larity at B will have been noticed in various mechanical andphysical tests. The differences in the structural characters ofthe alloys render these differences of behavior towards attacksby acid quite intelligible. In the solution in acids of the pearliticalloys with duplex structure^ differences of potential are prob-ably set up, which doubtless facilitate the attack. In the poly-hedral alloys, on the other hand, where the structure appears Fig. 8Corrosion ZOJ, Nickel per cent to be homogeneous, such differences of potential cannot occur,and solution will be more difficult. The results are plotted inFig. 8. The remainder of the paper is devoted to an exhaustiveinquiry into the critical ranges on cooling and heating, and themetallography of the alloys. It defies abstraction, and is toolong to reproduce in full. An important conclusion, which refers,we understand, specifically to K, but has doubtless a generalapplication, is as follows: Summarizing the results, it is seen that the structuresinduced by (a) forging, (b) bending and (c) compressing, whichdeformed the bars, however, without fracturing them, can beremoved, and the original types reverted to, by a short heattreatment at 8oo° to 9000 C. (14720 to 16520 F.); while thestructural results produced by stresses, which caused fracture, ii2 The Iron and Steel Magazine arc not so easy to remove. However, in the case of the forgedtensile and torsion sections
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Keywords: ., bookcentury1800, bookdecade1890, bookidironsteel, booksubjectiron
