A Study Of The Deposit Electrode With Wear-Impact-Resisting

The wear of mechanical elements will result in the decline of precision, unstable quality and inferior products, and the falling of productivity simultaneously. More seriously, the abrasion to certain extent may cause accidents, then leads to casualties and production loss. The instance will become worse for the elements under rigorous work condition. For example, the jaw plate of jaw crusher is manufactured by high manganese steel, which is grain abrasion-resistant. But the jaw plate must be replaced frequently because the abrasion is severe for intense impact and attrition wear from ores. The wear extent of the jaw plate will be greater and operating life will be shorter when it is overlaid with surfacing material whose degree of hardness is lower;the deposited metal may get brittle and working life will be shortened while overlaid with material whose degree of hardness is higher, because the deposited metal becomes brittle and easier to fracture as hardness grows, and its resistance to impact declines at the same time. Therefore, impact abrasion resistant surfacing electrode of this kind was studied in this paper. This sort of multiple microalloyed electrode with Fe—Mn—Cr—Mo—V alloy system, is a kind of austenitic surfacing alloy which belongs to iron-base wear resistant materials. For the purpose of alloying, some elements were put in, such as Cr, Mo, V and others, besides the major alloy element-Mn. Austenite was uniquely detected in the deposited metal.The properties of this surfacing electrode were found better than traditional surfacing electrode D256, through check experiment of resistance to wear. The hardness of this surfacing electrode moved up to HRC45 from HRC32 after work-hardening impact test;the surfacing layer became hardly abraded after 40 minutes' impact wear test. By studying the work-hardening and abrasion performance of this kind of austenitic material, the mechanisms of work-hardening and abrasion, influencing law of alloying agent on abradability and abrasive mechanism were discussed. Easily to be work-hardened is the greatest feature of this alloy, its surface hardness may get up to HRC 45~HRC 55,and the thickness of strain-hardening layer will reach 5~20mm whensubject to impacts with rather large loads. Therefore, this kind of alloy especially suits for heavily stressed grain-abrasive circumstance with impact.