Impact and Abrasion or Gouging Abrasion

 

Final Overlay

When abrasion is combined with some degree of impact and weight, the resulting wear is called Gouging Abrasion.  Gouging Abrasion occurs when large abrasive objects, such as rocks, are forced under pressure against a metal surface, leaving prominent gouges and grooves.

There are many applications where impact is accompanied by abrasion.  Good examples of low velocity gouging abrasion are dragline, power shovel and clamshell buckets.  Most crushing applications, which involve both impact and abrasion forces, are good examples of high velocity gouging abrasion. 



Recomended Alloy

Due to the high stress and impact from this type of wear, abrasion resistant materials with a high degree of toughness are required.  A combination of a harder, more abrasion resistant chromium carbide overlay, deposited over a tougher work-hardening manganese buildup alloy is often very successful.

The hard surfacing alloy that should be used is determined by fracture characteristics of the abrasive particle.  Generally abrasive materials that fracture easily (friable) allow harder overlays while abrasives which are tough to break down require tougher hardfacing overlays.  Also, the greater the impact and the larger the abrasive, the tougher the overlay needed.

Impact and Abrasion