为研究碳纳米管的耐磨性能，将其涂覆于４５钢表面，在氩气保护下采用３ｋＷＣＯ２连续激光器进行处理，然后进行淬火和低温回火，测定处理前后试样的组织结构和硬度，并采用ＭＨＫ－５００环块磨损试验机进行磨损性能测试。试验结果表明：经激光处理后，部分碳纳米管得到保留，部分碳纳米管在４５钢表面与Ｆｅ生成Ｆｅ３Ｃ，并且产生一层含２．５％～３．５％Ｃ的亚共晶合金化层，经进一步淬火后表面硬度可达ＨＲＣ７０，耐磨性也大大改善，分别比４５钢合金化、４５Ｃｒ熔凝和４０Ｃｒ合金化提高４０％、１８％和３１％。 In order to study the wear resistance of carbon nanotubes, the surface of 45 steel was coated with 3kWCO2 continuous laser under the protection of argon gas, followed by quenching and tempering at low temperature. The microstructure and hardness of the samples were measured before and after treatment. And the use of MHK-500 ring block wear testing machine wear test. The experimental results show that some of the carbon nanotubes are retained after laser treatment. Some carbon nanotubes form Fe3C with Fe on the surface of 45 steel and produce a hypoeutectic alloy containing 2.5% ~ 3.5% C Layer, after further quenching the surface hardness of up to HRC70, wear resistance is also greatly improved, respectively, than 45 steel alloying, 45Cr 40Cr alloyed and 40% alloying increased by 40%, 18% and 31%.