IRON-BASE COMPOSITION FOR PROLONGING LIFE OF TOOLS AND DIES USED IN METALLIC ALLOY PROCESSING

摘要

The present disclosure relates to an iron-base repair alloy composition capable of repairing a degraded section of a metallic alloy article, especially dies and tools used in metallic alloy processing. The disclosed repair alloy composition can build up a weld repair layer with high resistance to deformation, crack propagation, liquid erosion, thermal softening, fatigue and abrasion onto worn, cracked and damaged sections of a metallic alloy article, and thereby significantly increase the service life of metallic alloy articles being repaired. Further, the disclosed repair alloy composition can form a weld repair layer having high hardness, toughness and edge retention properties with an ability to withstand greater impact and mechanical stresses. In an aspect, the disclosed iron-base repair alloy composition can include, by weight: from 12 to 18% Cobalt, from 1 to 11% Nickel, from 0.5 to 8% Chromium, from 4 to 14% Molybdenum, from 0.5 to 1% Titanium, from 0.02 to 0.3% Boron, from 0.5 to 2.0% Silicon, from 0.3 to 2.5% Manganese and balance Iron. The present disclosure further provides an easier and effective method for repairing a degraded section of a metallic alloy article using the iron-base repair alloy composition by machining as-welded low hardness weld deposit before subjecting it to precipitation treatment for desired hardness and wear and corrosion properties.