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METHODS TO IMPROVE WEAR RESISTANCE (Deep Cryogenic Treatment (One-time,…
METHODS TO IMPROVE WEAR RESISTANCE
Deep Cryogenic Treatment
One-time, permanent process
Improves physical and mechanical properties of various materials (ferrous, nonferrous metals, aluminum and their alloys)
Uses subzero temperatures to stabilize, refine and close grain structures
Releases internal stresses for longer wearlife
Applying chemical dopants
chemical compounds used as dopant
molybdenum disulfide
graphite powder PGML-2
, increasing the depth of diffusion of lubricants in the metal surface can significantly extend the life of the friction surfaces without significantly changing of their hardness
diffuse of lubricant
SPD processing
tribology categories
surface hardening
Nitriding
Nitrogen is introduced to the surface of a special alloy steel (with Al and Cr) component by diffusion to form alloy nitride precipitates to produce a hard surface layer
It is done at around 525°C
Flame hardening
a thin surface shell of medium carbon steel or cast iron is heated rapidly to austenite by an intense high temperature flame of propane and oxygen gas mixture, then quickly quenched to obtain martensite of high hardness. In flame hardening chemical composition of the steel doesn’t change Surface Hardening
Induction Hardening
Surface of the part is heated very fast by induction heating and
then quenched
Part is put in a work coil composed of several turns of water cooled copper
By passing current through this coil, an eddy current is induced on the surface of the part, which heats the surface. Then the part with the austenitized surface is quenched by using water jets
