Abstract
Double glow plasma surface metallurgy and heat treatment technology that generated excellent properties reinforcing layer on the surface of Q235 steel was introduced. Using this technology, the alloying elements of Mo, Cr, C can be obtained on the surface of Q235 steel. The content of constituent elements was near or equal to metallurgic high speed steel (HSS). The fundamental principle is that alloying elements Mo, Cr are penetrated into the Q235 steel in a vacuum chamber by glow discharge sputtering so that the content of alloyed layer content was about 20% Mo and 10% Cr on the surface of Q235 steel. Then after ultra-saturated carbonization alloyed constituent was similar to molybdenum HSS with surface carburizing of more than 2.0%. After quenching + low tempering; quenching + cryogenic treatment for 2 h + low tempering; quenching + cryogenic treatment for 16 h + low tempering, it was found that the surface hardness of cryogenic treatment was up to 1600 HV much higher than that without cryogenic treatment. The abrasion test results indicate that carbonization + quenching + low tempering, infiltration of Mo–Cr + carbonization + quenching + infiltration of Mo–Cr + carbonization + quenching + cryogenic processing for 2 h + low tempering and infiltration of Mo–Cr + carbonization + quenching + cryogenic processing for 16 h + low tempering the relative wear resistance was higher by one order in magnitude.
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