The Iron and steel magazine . it willbe seen that they all give the same kind of result. With theintroduction and increase of nickel content up to 4 per centthe change in the properties is gradual; the material, whenunder elastic stress, yields more to the stress; at the same time,after the apparent yield point is passed, the maximum stress Iron Nickel Manganese-Carbon Alloys ioy increases. Although the change of properties is gradual, th<is in nearly every case a more or less pronounced kick in thecurves between o and 4 per cent nickel. At some point betweenthe percentages of and
The Iron and steel magazine . it willbe seen that they all give the same kind of result. With theintroduction and increase of nickel content up to 4 per centthe change in the properties is gradual; the material, whenunder elastic stress, yields more to the stress; at the same time,after the apparent yield point is passed, the maximum stress Iron Nickel Manganese-Carbon Alloys ioy increases. Although the change of properties is gradual, th<is in nearly every case a more or less pronounced kick in thecurves between o and 4 per cent nickel. At some point betweenthe percentages of and nickel, there is a very suddenchange in nearly all the properties, evidenced by a rapid increaseof maximum stress, which reaches the highest value at cent nickel, a fall of ductility, and an increase of brittleness,as shown by the bending, tension, torsion and shock , as far as industrial products are concerned, a dangerlimit for nickel content is found at 4^ per cent, when carbon Fig. ~l—1 1 1 » I 1 a, 10 15 20% Nickti per cent* and manganese are present to the extent of .44 per cent and .88per cent respectively. After this sudden break in the curve, the various propertiesalter more slowly again until a percentage somewhere in theneighborhood of 16 is reached, i. e., the brittle zone extendsfrom about 5 to 16 percent. From this point on, the change ismore rapid, and in the reverse direction to the original rapidchange. Fig. 1 is thus roughly typical of any of the curves. Mechanical Properties of the Cast Material These results follow generally the same order as those ofthe forged material, maximum tensile strength, however, being 108 The Iron and Steel Magazine represented at a content of per cent nickel. Singularlyenough, this maximum is associated with an elongation of 4%per cent, and the three steels, which in the forged condition aredistinctly brittle, show in the cast normalized state elongationsof , and per cent
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Keywords: ., bookcentury1800, bookdecade1890, bookidironsteel, booksubjectiron
