2015•Cailiao baohuRequires access
Performance of Surface Strengthened 20CrMo Gear Material by Pulse Laser Beam
Li Hu
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Abstract
Cailiao Baohu 2015,48(08),47 ~ 49(Ch).20 CrMo alloy steel after carburizing was surface strengthened by pulsed laser,and the performance of the samples was compared with that strengthened by the traditional quenching after carburizing and tempering at low temperature.Results showed that a dense hardening layer was formed on the surface of 20 CrMo alloy steel under the fusing effect of the laser.The greater the laser energy,the thicker the hardening layer was.The maximum of the hardening depth reached 0.35 mm.Compared with the sample prepared by the traditional quenching after carburizing and tempering,pulsed laser surface strengthening increased the surface roughness of the sample,but the surface hardness was also increased by 75%,and friction coefficient and wear loss were both lower,therefore effectively improving the wear resistance of 20 CrMo alloy steel.