The Iron and steel magazine . nto two groups, one includingductile and the other brittle steels. Up to 4J per cent nickel,ductility is fairly high; per cent nickel marks an accession 104 The Iron and Steel Magazine of brittleness, whilst per cent nickel denotes the return ofductility. This return is complete at per cent nickel. Compression tests were made on cylinders .35 inch indiameter by .56 inch high, these dimensions being selected inorder to attain a maximum load equal to 100 tons per squareinch. The compressibility of the series decreases with an increaseof nickel until
The Iron and steel magazine . nto two groups, one includingductile and the other brittle steels. Up to 4J per cent nickel,ductility is fairly high; per cent nickel marks an accession 104 The Iron and Steel Magazine of brittleness, whilst per cent nickel denotes the return ofductility. This return is complete at per cent nickel. Compression tests were made on cylinders .35 inch indiameter by .56 inch high, these dimensions being selected inorder to attain a maximum load equal to 100 tons per squareinch. The compressibility of the series decreases with an increaseof nickel until a minimum is reached at G, per cent compression curve (Fig. 5) has a strong resemblance topreceding curves representing different aspects of ductility. Itwill, however, be noted that, in the return of the curve, theright-hand branch does not attain its initial height. Under shock tests only three of the steels fractured, theremaining specimens bending to a greater or less extent. Gen- Fio. 3.— Yield 5 10 15 Nickel per cent zo% erally speaking, the differences between the first four steels —those that did not break — are not great; they were all bent,and shock developed no visible flaw in any one. When, however,the nickel content is raised from to per cent, thendecisive brittleness under shock is shown; this increment ofonly .7 per cent results in the steel fracturing with comparativeease. The minimum is found with F, a result which coincideswith that of the same steel under tension. The behavior of His noteworthy, a steel which in the preliminary bending testsfractured on reaching an angle of 10 degrees. Under shock thissteel absorbs 436 inch-pounds, and bends to an angle of 7\degrees without developing any apparent flaw. The expendi-ture of an equal amount of work in the case of A and K showsthe higher ductility of the latter, even when that work is appliedas shock. Iron Nickel-Mangam »< Carbon Alloys l o c ?P a r< r*! O JO i- 1
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Keywords: ., bookcentury1800, bookdecade1890, bookidironsteel, booksubjectiron
