Journal . and i inch wrought iron) showed a coarselycrystalline fracture. The fractures were cut offaiid preserved, micro-specimens were cut andsections in the t\\o principal planes prepared. The links were divided, and one half of eachwas annealed tor i hour embedded in sand from700^ C. to 800° C. On fracturing the usualtough fibrous structure of wrought iron wasevident. Small test pieces were cut from thetwo halves and a marked difference in ultimatestress, elastic limit, and elongation observed. Inthe case of the small link the fracture had occurredat the old weld surface, which was oxidise
Journal . and i inch wrought iron) showed a coarselycrystalline fracture. The fractures were cut offaiid preserved, micro-specimens were cut andsections in the t\\o principal planes prepared. The links were divided, and one half of eachwas annealed tor i hour embedded in sand from700^ C. to 800° C. On fracturing the usualtough fibrous structure of wrought iron wasevident. Small test pieces were cut from thetwo halves and a marked difference in ultimatestress, elastic limit, and elongation observed. Inthe case of the small link the fracture had occurredat the old weld surface, which was oxidised, andliad evidently been imperfectly joined. The largeamount of slag present in the material undoubtedlyhelped to weaken the link, but the primary causeof fracture was not actual lack of annealing, ofwhich the chain received plenty, but annealing attoo low a temperature. The coarsely crystallinestructure is said to be produced in iron containingless than Ol 1 o carbon by heating to below 700 ^ C. >t V.
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectchemist, bookyear1882
