45钢激光淬火工艺优化及性能

发布时间：2018-08-11 20:32

【摘要】：利用LSSK-009型数控激光熔覆机对45钢进行激光淬火,通过正交试验方法优化了激光淬火工艺参数,研究了离焦量、电流、扫描速度等工艺参数对45钢表面硬度的影响。结果表明:影响45钢表面硬度的主要因素是离焦量,其次是电流;最佳的激光淬火工艺参数为离焦量22.5 mm、电流210 A、扫描速度300 mm/min;45钢经最佳激光淬火工艺,搭接率为44%的多道扫描激光淬火处理后,由表及里依次为完全相变硬化层、热影响区和基体,其中完全相变硬化层的组织为针状马氏体和残留奥氏体,深度为0.48 mm,宽度为1.15 mm,硬度为842 HV0.2,比45钢整体淬火提高18%,热影响区的组织由完全马氏体逐渐转变为珠光体和铁素体组织,厚度为0.1~0.2 mm,硬度从823 HV0.2到438 HV0.2呈梯度分布;相邻道与道之间的表面硬度从842 HV0.2到450 HV0.2呈梯度分布,热影响区宽度为0.3 mm。
[Abstract]:The laser quenching of 45 steel was carried out by means of LSSK-009 laser cladding machine. The parameters of laser quenching were optimized by orthogonal test, and the effects of defocus, current and scanning speed on the surface hardness of 45 steel were studied. The results show that the main factors affecting the surface hardness of 45 steel are defocusing, followed by electric current, the optimum laser quenching parameters are 22.5 mm defocus, 210A current, 300 mm scanning speed and 300 mm / min 45 steel after laser quenching. After laser quenching with 44% overlap rate, complete transformation hardening layer, heat affected zone and matrix are in order from surface to interior. The microstructure of the complete transformation hardening layer is acicular martensite and residual austenite, and the microstructure of the complete transformation hardening layer is acicular martensite and residual austenite. The depth is 0.48 mm, the width is 1.15 mm, the hardness is 842 HV0.2, which is 18% higher than that of 45 steel. The microstructure of the heat affected zone is gradually changed from complete martensite to pearlite and ferrite. The thickness is 0.1 mm and the hardness is distributed gradient from 823 HV0.2 to 438 HV0.2. The surface hardness of adjacent channels varies from 842 HV0.2 to 450 HV0.2, and the width of the heat-affected zone is 0.3 mm.
【作者单位】：华东理工大学机械与动力工程学院;宁波工程学院材料学院;
【分类号】：TG161

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