. The Iron and steel magazine. sight of. The improvement in the state of reciprocalsolution impedes crystallization, but occasions osmotic pressure,, both removes and confers brittleness. This explains whyadditions of nickel, which, up to about 2 per cent, are devoid ofdanger, begin to become so above this percentage. The steel .4 hstracts 435 early assumes the characteristics of a highly worked metal,corresponding to a quenched carbon steel. Above 8 or loper cent of nickel the steel is difficult of employment, that is,until the proportion reaches that which induces the transition ofthe ir
. The Iron and steel magazine. sight of. The improvement in the state of reciprocalsolution impedes crystallization, but occasions osmotic pressure,, both removes and confers brittleness. This explains whyadditions of nickel, which, up to about 2 per cent, are devoid ofdanger, begin to become so above this percentage. The steel .4 hstracts 435 early assumes the characteristics of a highly worked metal,corresponding to a quenched carbon steel. Above 8 or loper cent of nickel the steel is difficult of employment, that is,until the proportion reaches that which induces the transition ofthe iron to the ;- state. Will the application of steels of this category always remainsomewhat rare? It may be permitted to doubt it, and the suc-cess of Mr. Hadfields non-magnetic manganese steel justifies thisdoubt. In the meanwhile there is nothing to hinder the extendeduse of steels with low percentages of nickel; they are admirablyadapted in all cases where it is important to diminish brittle-ness or to reduce weight. No. The Nature of Troostite. Carl Benedicks. Paper pre-sented at the September,1905, meeting of the Iron andSteel Institute. 5,000 w., il-lustrated. — The author re-calls the original definitions ofOsmond regarding the natureof troostite and opposes Boyn-tons suggestion that troostitemight be ^ iron. ^^ It isquite natural to assume, theauthor writes, that troostiteis that part of martensite inwhich cementite has just be-gun to form (incipient pearliteformation), but that owing to the rapidity of the cooling, theseparate particles of cementite do not attain to such a sizethat they can be distinguished microscopically. Boyntons theory must fall or stand by the presence orabsence of troostite in hyper-eutectoid steel, and the authorcontends that Boynton avoids the difficulty by calling thistroostite sorbite. ^ The facts, he writes, ^ are in entireaccord with the hypothesis that troostite is a pearlite with ultra-microscopically small particles of cementite. T
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Keywords: ., bo, bookcentury1800, bookdecade1890, booksubjectiron, bookyear1898
