. Railway age . Illustrated by the acconi|)auying diagram of ihc microstruclure inthe Sohoen wheel, In which the four strips and the location of themlcropholographs are niughly Indicated. Strip No. 1 shows a very line grain at the surface with carbonwell below per cent. This structure runs down for ntiout /;, in., where there beginK a gradual increase of ibe grain sizeuntil the normal dlmenxionii are reacbeelowthe lop of the flange. The flrrt /,, In. lii formed of a very floemixture of aljout equal proportlonH of ferrlte and pearliie. andbelow thlM the ferrlte gradually dli>api>earH
. Railway age . Illustrated by the acconi|)auying diagram of ihc microstruclure inthe Sohoen wheel, In which the four strips and the location of themlcropholographs are niughly Indicated. Strip No. 1 shows a very line grain at the surface with carbonwell below per cent. This structure runs down for ntiout /;, in., where there beginK a gradual increase of ibe grain sizeuntil the normal dlmenxionii are reacbeelowthe lop of the flange. The flrrt /,, In. lii formed of a very floemixture of aljout equal proportlonH of ferrlte and pearliie. andbelow thlM the ferrlte gradually dli>api>earH and the grains increaiieIn Bize. At a depth of /,, In. the ferrlte appears &S a dlscoatinuoustend or envelope around the grains of pearllte. Indicating that thecjirlion (ontent Is aljout per cent. This increai-e In the ilzeof the grains continues downward until they reach their maximumat a depth of about 1 In. In strip No. 2 there Is the same flne-grained surface structure. Microphotographs of F Wheel. ^ /M //A. Interpretation of Grain Structure in Schoen Wheel at VaryingDistances Below Surface of IFj M-JC\ ]2, A/ B£LOtV TJtSAD^ ^S OF B T//f£ ^ ((II corresponding to that of No. 1. The depth of this decreasesfrom one side of the strip to the other and Is about /,, In. thickat the corner. This structure Is shown In the photograph No. the r!ght hand side, two zones will be seen: one of which, start-ing at f\. Is of very tine pearllte. The point of maximum coarse-nests Is at d. This is not really a coarse grain In Itself, for It Isline even when compared with that of the P tire. Below rl thereis an abrupt change to extreme fineness aptin at /2. This Is fol-lowed by a gradual increase In the size of the grain down to the normal structure Is found at a depth of about 1 strip No. :< there is the same fine grain at the surface, as January 24, 1908. THE RAILROAD GA2ETTE. 117 A/SJ/, /IT FDGE or r/fs^yio Of^- r/rÂ
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Keywords: ., bookcentury1800, bookdecade1870, bookidrailwayage44, bookyear1870
