【摘要】 为改善AISI 4130钢表面硬度和腐蚀磨损性能，用高功率激光器在AISI 4130钢表面制备淬火层，利用扫描电镜(SEM)和X射线衍射仪(XRD)研究不同功率淬火试样的微观结构，利用电化学工作站分析淬火前后试样的耐蚀性能，利用维氏显微硬度仪对淬火试样截面进行硬度测试，采用往复摩擦磨损试验机，测试不同淬火试样的耐磨损性能。结果表明，激光淬火后AISI 4130钢表面主要为马氏体组织和富Cr碳化物颗粒。基材、2.0 kW淬火试样及2.2 kW淬火试样的维钝电流密度依次为60.00、102.28和108.58μA/cm~2，淬火试样的耐蚀性降低。激光处理后，淬火层表面硬度提高了85%以上，AISI 4130钢基体与2.0和2.2 kW激光淬火试样的平均摩擦系数分别为0.366、0.293和0.195，摩擦系数下降，淬火试样的耐磨性提高。更多还原

【Abstract】 Laser quenching technology is widely used as a means for the strengthening in the field of metallic materials.Laser quenched materials have the advantages of high precision,small heat affected zone,uniform carbide dispersion and finer grains.In order to improve the surface hardness and wear resistance of AISI 4130 steel used in petroleum field,a high hardness and high wear resistance quenching layer was prepared on the surface of AISI 4130 steel by laser quenching technology.The effect of quenching power on the microstructure evolution,corrosion resistance,microhardness and wear resistance of AISI4130 steel were investigated.AISI4130 steel samples of 10 mm×10 mm×8 mm (L×W×H)were prepared by wire cut electric discharge machine.The quenching layer was prepared on the surface of AISI 4130 steel by high power laser.The microstructure and element distribution characteristics of the steel quenched with different power was studied by scanning electron microscope (SEM) with EDS and X-ray diffractometer (XRD).The corrosion resistance of the steel before and after quenching was assessed by electrochemical workstation and immersion test.The hardness of quenched steels was measured by Vickers microhardness tester.The wear resistance of different quenched steels was tested by reciprocating friction and wear tester,while the wear scratch morphology was analyzed by three-dimensional optical microscope.After laser quenching,the surface microstructure of AISI 4130 steel was obviously refined and composed of mainly martensite and Cr-rich carbide particles.The thickness of the heat affected zone of the steels of laser quenched at 2.0 and 2.2 kW was 501.5 and 553.6μm,respectively.The impedance arc radius of the bare AISI 4130 steel and two quenched steels may be ranked as the following:2.2 kW quenched>2.0 kW quenched>substrate.The passive current density of the bare steel,2.0 kW-and 2.2 kW-quenched steel was 60.00,102.28 and 108.58μA/cm~2,respectively.The passivation current density of the two quenched steels was about 1.7 times that of the bare one.After quenching,the surface hardness of the steel increased by more than 85%.The average friction coefficient of the bare AISI 4130 steel and 2.0 kW-and 2.2 kW-laser quenched ones was 0.366,0.293 and0.195,respectively.Compared with the bare steel,the volume wear rate of 2.0 kW-and 2.2 kW-laser quenched ones was reduced by 25%and 36%,respectively.The wear resistance of quenched steels increased by 20%and 47%,respectively.The corrosion resistance of the quenched steels is reduced,but the corrosion resistance of the 2.0 kW quenched steel is better than that of the 2.2 kW ones.The precipitation of Cr-rich carbide particles in the steel will aggravate the destruction of the corrosion product film,resulting in a decrease in the corrosion resistance of the quenched steel.The higher the carbide content on the surface of the quenched steel,the more difficult it is to cut the convex surface of the abrasive into a tough phase and the wear rate of the sample surface decreases,thereby improving the overall wear resistance of the material.更多还原