激光与光电子学进展, 2014, 51 (9): 091602, 网络出版: 2014-08-20  

Cr12钢激光表面熔凝后的性能研究

Research on Properties of Cr12 Steel Processed by Laser-Remelting
作者单位
1 浙江大学宁波理工学院,浙江 宁波 315100
2 太原科技大学机械工程学院,山西 太原 030000
摘要
采用Nb:YAG 激光器对高碳高合金钢Cr12 进行了表面熔凝处理试验,分析了激光加工参数对熔凝单元体宽度的影响,采用光学显微镜、扫描电镜以及能谱仪分析了激光熔凝处理后Cr12 钢单元体的微观组织和化学成分分布,测量了不同激光加工参数下熔凝单元体宽度,并用显微硬度计测试不同区域的微观硬度。结果表明:激光熔凝处理后得到熔凝区、热影响区和基体三层组织。熔凝区组织为极细的等轴晶和柱状晶,消除了夹杂相,合金元素基本均匀分布。热影响区的显微硬度较基体显著提高,熔凝单元体宽度随激光参数的变化呈一定规律性变化,其中离焦量对单元体宽度影响最大。
Abstract
An attempt is made to research how does the laser processing parameters impact the width of melted zone in the high carbon alloy steel Cr12 surface using Nb:YAG laser as a heat generating source.The microstructure and chemical composition distribution of Cr12 steel after laser-remelting are observed and analyzed by using optical microscopy, scanning electron microscopy(SEM)and energy spectrometer(EDS). Different widths of melted zone, which are processed by different laser processing parameters, are measured. Hardnesses of laser melted zone are also investigated. The results show that Cr12 steel gets three layers structures, including the melting zone, heat affected zone and the matrix. The microstructure of melted zone has very fine equiaxial crystal and columnar crystal, which eliminats the impurity phase, and the alloying elements are evenly distributed after laser-remelting process. The microhardness of heat affected zone is improved significantly, and the width of melted zone changes along with laser parameters variation and defocusing distance has the most effect on the width of melted zone.

史华亮, 李继强, 贾志欣, 刘立君. Cr12钢激光表面熔凝后的性能研究[J]. 激光与光电子学进展, 2014, 51(9): 091602. Shi Hualiang, Li Jiqiang, Jia Zhixin, Liu Lijun. Research on Properties of Cr12 Steel Processed by Laser-Remelting[J]. Laser & Optoelectronics Progress, 2014, 51(9): 091602.

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