. Railway age . normal Htructure waji found but In- no visible defect on the with Hlag cracks as In the other defective tires. These The material In this particular wheel Is bad In every par- uri) Hhown In Nos. 51 to 54, eorae of which were taken close to ticular. The carbon content Is low, apparently ranging from 0 3j tin- cdK<- of the tread. In nomc thero were apoU of man- to per cent. The effect of both the work and heat treatment KaiiCHe blfiiilphlde near the edgcH, but the cause for failure 1h the Is practically nil and the structure looks like that of u
. Railway age . normal Htructure waji found but In- no visible defect on the with Hlag cracks as In the other defective tires. These The material In this particular wheel Is bad In every par- uri) Hhown In Nos. 51 to 54, eorae of which were taken close to ticular. The carbon content Is low, apparently ranging from 0 3j tin- cdK<- of the tread. In nomc thero were apoU of man- to per cent. The effect of both the work and heat treatment KaiiCHe blfiiilphlde near the edgcH, but the cause for failure 1h the Is practically nil and the structure looks like that of untreated of Ihn hIiik Haws iliat form planes of extreme weakntss. cast steel or a metal that has been oveiheate<l. The surface shows DhotoKranh No. 51 such a Ilaw Is shown, which eventually muKt the effect of cold rolling In the mixture of ferrite and slag, the Another example of the same sort Is have cauKOd shelling In No. 52. In the B wheel, the slag flaws can be seen In Nos. 55 and 56,. whole having a schistose appearance The pr■•^ence of so muchslag, as shown In Nos. 55, 66 and 57. renders the wheel totally unfitfor service. The grain Is coarse, as Is seen In photos Nos. 58 and59, and resembles that In the new wheel of the same brand thatwas examined. The carbon content of the new wheel, however, wmapparently much higher. In the shelledout portion of the F wheel the slag flaws alsoappear well down In the metal, ste Nos. 61 and 62. What waa
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Keywords: ., bookcentury1800, bookdecade1870, bookidrailwayage44, bookyear1870
