STUDIES IN 6 Cr WHITE IRON ALLOYED WITH Mn. AND Cu.

Abstract

A study ties been of tho effect of heat-treatrnent on ha ness# microtructure wd corrosion behaviour ( in 5'6 Noci solution) in a Cr white iro alloyed with 6"'/. to and 1 T, Cu. Heat-treatments comprised of aircooling or oil quenching from 900, 950, 4000 and 1050°C ftor bolding at cch of these tez er tutus,, for 4,6,6 and. 10 hours# respectivc1y* Corrosion studies were varied out on oil quenched s plos, scwe of -..,i' i h were sass relic red by holding them for 0,5 hour at 60OPC followed by .~* o ing oz furnace cooling, I t is observed that niicrostn1Cttirec with atrneitie matrix are mot favourable froi the Point of v ew Zf corn) l on rest steno . The 'o ro ,ozi 0 a no phase resembling the sigma phase evrsly effects the corrosion resistnce. P esorce of massive carbide is not detrimental to corrosion although a smaller urne frectior is pro erg. The effect of dispersed carbides depend upon their size and d,istr bution, Streso relieving haw ban found to be useful,* The key parameter in contro1ii tho corrosion is the amount and the otth ilityr of .caste to The results which have been appropriately discussed pro de useful clues to the design of future c rr'06ioa »os stant alloy compos