脉冲激光束表面强化20CrMo齿轮材料的性能

Performance of Surface Strengthened 20CrMo Gear Material by Pulse Laser Beam

传统的渗碳后淬火+低温回火方法处理20Cr Mo齿轮材料会产生较大的应力和变形,将对齿轮的质量产生极为不利的影响。采用脉冲激光束对渗碳后的20Cr Mo合金进行表面强化,并与传统的渗碳后淬火+低温回火的处理方式进行了对比。结果表明:20Cr Mo合金钢在激光熔凝作用下表层产生了致密的硬化层,且激光照射能量越大,硬化层越厚,硬化深度最大可达到0.35 mm;与渗碳后淬火+回火处理的试样相比,激光束照射虽然使表面粗糙度上升,但是表面硬度可提高75%,摩擦系数和磨损量均较低,有效改善了其表面的耐磨性。

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.