应用激光, 2009, 29 (6): 502, 网络出版: 2010-06-13   

2Cr13汽轮机叶片激光合金化的组织性能

Microstructure and Performance of 2Cr13 Steam Turbine Blades after Laser Alloying
作者单位
1 杭州汽轮机股份有限公司,浙江 杭州 310022
2 浙江工业大学 机械制造及自动化教育部重点实验室,浙江 杭州 310014
摘要
为提高调质态2Cr13低碳马氏体不锈钢汽轮机叶片的抗气蚀性能,采用连续CO2横流激光器对其表面进行激光合金化处理,考察其显微组织、显微硬度和抗气蚀性能。结果表明,激光合金化处理后,显著地改变了2Cr13不锈钢表面的显微组织结构,表面平均硬度可达到701.2HV0.2(基材表面显微硬度为200~250HV0.2),横向残余应力为211.70MPa,纵向残余应力为334.60MPa。激光合金化后,抗气蚀性能比合金化前提高一倍以上。因此,激光合金化在提高抗气蚀性能和延长叶片使用寿命上具有较好的应用前景。
Abstract
In order to improve the resistance to cavitation of steam turbine blades (2Cr13 low-carbon martenstic stainless steel),a continuous wave CO2 laser processing system was used for surface alloying in this paper. The microstructure,microhardness and cavitation resistance were studied. The microstructure of surface was refined after laser alloying which is different from the base material. The average microhardness after laser alloying can achieve 701.2 HV0.2 (while base materials 200~250HV0.2). Residual stresses of transverse and longitudinal direction were 211.70MPa and 334.60MPa respectively. The cavitation resistance of the laser alloying steam turbine blades was increased to one time more than that of the original blades,which proved that laser alloying was promising to improve the properties and life time of steam turbine blades.

赖海鸣, 王梁, 张群莉, 姚建华. 2Cr13汽轮机叶片激光合金化的组织性能[J]. 应用激光, 2009, 29(6): 502. Lai Haiming, Wang Liang, Zhang Qunli, Yao Jianhua. Microstructure and Performance of 2Cr13 Steam Turbine Blades after Laser Alloying[J]. APPLIED LASER, 2009, 29(6): 502.

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