应用激光, 2016, 36 (2): 131, 网络出版: 2016-06-06  

基于汽轮机转子轴表面激光再制造层的性能研究

Research on Properties of Laser Remanufacturing Coatings based on the Surface of Steam Turbine Rotor
作者单位
1 中原工学院机电学院, 河南 郑州 450007
2 浙江工业大学激光先进制造研究院, 浙江 杭州 310014
3 浙江省高端激光制造装备协同创新中心, 浙江 杭州 310014
摘要
针对汽轮机转子轴颈易损伤的问题, 采用2 kW半导体激光器进行同轴送粉的激光再制造Fe基合金试验, 以提升其表面性能, 解决失效问题;采用显微硬度计、气蚀装置与残余应力分析仪分别测试了再制造层的显微硬度、抗气蚀性能与残余应力。结果表明, 再制造层最高显微硬度为359 HV0.2, 平均显微硬度为353 HV0.2, 较基体提高20%, 再制造层的抗气蚀性能较基体提高了3倍以上。再制造层的表层两端的残余应力为压应力, 中部为拉应力, 从基体到热影响区逐渐升高;沿层深由再制造层至热影响区, 残余压应力先转变为拉应力, 再转变为压应力。另外由实验数据依据弹性力学的叠加原理, 提出了确定再制造层残余应力的反推法。
Abstract
In order to enhance the surface properties and solve the failure problem, Fe-based alloy remanufacturing experiment was performed on steam turbine rotor shaft journal by a 2kW diode laser with coaxial powder feeder. The microhardness, resistance cavitation property and residual stress of the laser remanufacturing layer were examined by the microhardness tester, experimental device for cavitation erosion and residual stress analyzer. The results show that the highest microhardness of remanufacturing layer is about 359 HV0.2, and the average microhardness is 353 HV0.2, compared with the substrate, which is increased by 20%. The resistance cavitation property of the laser remanufacturing layer is 3 times more than that of the substrate. The residual stress in the both ends of surface remanufacturing layer is compressive stress and in the middle is tensile stress. The value of residual stress from substrate to heat affected zone is slowly increased. Along the depth of the layer to the heat affected zone, the residual compressive stress is changed into tensile stress, and then transformed into compressive stress. According to the superposition principle of elastic mechanics based on experimental data, a method for determining the residual stress of remanufacturing layer is proposed.

郭士锐, 姚建华. 基于汽轮机转子轴表面激光再制造层的性能研究[J]. 应用激光, 2016, 36(2): 131. Guo Shirui, Yao Jianhua. Research on Properties of Laser Remanufacturing Coatings based on the Surface of Steam Turbine Rotor[J]. APPLIED LASER, 2016, 36(2): 131.

关于本站 Cookie 的使用提示

中国光学期刊网使用基于 cookie 的技术来更好地为您提供各项服务,点击此处了解我们的隐私策略。 如您需继续使用本网站,请您授权我们使用本地 cookie 来保存部分信息。
全站搜索
您最值得信赖的光电行业旗舰网络服务平台!