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Impact |
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| Wear from impact is caused by rapid, repeated application of a compressive load, causing the metal to deform (mushroom), fracture or peel off in pieces (spalling), directly below the point of impact. | ||
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Examples of impact applications include railroad switch points and frogs, and rock crushing equipment such as impact and roll crushers,
hammermill hammers and impact breaker bars. |
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| The
use of Manganese hard surfacing alloy is very common for this type of
wear. Under impact, manganese work-hardens very quickly, becoming
tougher and more wear-resistant, and in addition, can be deposited in
multiple layers without cracking. In many cases, for extreme
impact, manganese hardfacing alloys are used alone as a combination
build-up and final overlay. When the impact wear is combined
with severe gouging abrasion, as is commonly found with rock crushing
equipment, manganese alloys are used to rebuild badly worn parts back to
within 3/16"(4.8mm) to 3/8"(9.5mm) of the original size prior to applying a
more abrasion resistant overlay.
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