Cr12钢激光表面熔凝后的性能研究

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.

参考文献

[1] 魏兴钊, 朱伟恒，覃宁, 等. Cr12 型钢制冷作模具的失效分析与探讨[J]. 金属热处理，2011, 36(1): 14-23.

Wei Xingzhao, Zhu Weiheng, Qin Ning, et al.. Failure analysis and discussion of Cr12 type steel cold work dies[J]. Heat Treatment of Metals, 2011,36(1):14-23.

[2] 张蓉, 钱书琨. 模具材料及表面工程技术[M]. 北京: 化学工业出版社, 2008. 17-21.

Zhang Rong, Qian Shukun. Die Materials and Surface Engineering Technology [M]. Beijing: Chemical Industry Press， 2008. 17-21.

[3] 闫钧. 模具钢激光表面热处理的实验研究[D]. 夏门: 华侨大学, 2003.

Yan Jun. Researching on Heat Treatment of High-Power Laser to Mould Steel [D]. Xiamen:HuaQiao University, 2003.

[4] Jin-zhong Lu, Chao-jun Yang, Lei Zhang. Mechanical properties and microstructure of bionic non-smooth stainless steel surface by laser multiple processing [J]. Journal of Bionic Engineering, 2009, 6(2): 180-185.

[5] 庄其仁, 张文珍, 吕凤萍.模具表面的激光热处理研究[J].中国激光，2002, 29(3): 271-276.

Zhuang Qiren, Zhang Wenzhen, Lu Fengping. Study of the laser heat treatment for mould surface [J]. Chinese J Lasers, 2002, 29(3): 271-276.

[6] 马运哲，董世运，徐滨士, 等. 铁基合金激光熔覆技术工艺优化研究[J]. 中国表面工程，2006, 19(5): 154-160.

Ma Yunzhe, Dong Shiyun, Xu Binshi, et al.. Optimization of proceeding parameters in laser cladding Fe-based alloy [J]. China Surface Engineering, 2006, 19(5): 154-160.

[7] 黄志辉, 刘会霞, 沈宗宝, 等. 工艺参数对激光冲击微造型效果的影响[J]. 中国激光, 2012, 39(5): 0503004.

Huang Zhihui, Liu Huixia, Shen Zongbao, et al.. Process parameters analysis on surface texturing under laser shock peening [J]. Chinese J Lasers, 2012, 39(5): 0503004.

[8] 朱捷, 刘家浚, 陈南平. Cr12 钢激光相变硬化机理[J]. 金属热处理学报, 1990, 11(4): 67-73.

Zhu Jie, Liu Jiajun, Chen Nanping. The mechanism of laser transformation hardening on Cr12 steel [J]. Transactions of Metal Heat Treatment, 1990, 11(4): 67-73.

[9] 朱捷, 刘家浚, 陈南平. Cr12 钢激光硬化处理后的组织[J]. 材料科学进展, 1990, 4(6): 469-472.

Zhu Jie, Liu Jiajun, Chen Nanping. Microstructure of laser hardened Cr12 steel [J]. Materials Science Progress, 1990, 4(6): 469-472.

[10] 刘其斌.激光加工技术及其应用[M].北京: 冶金工业出版社, 2007. 68-69.

Liu Qibin. Laser Processing Technology and Applications [M]. Beijing: Metallurgical Industry Press, 2007. 68-69.

[11] 杨柳青, 丁阳喜, 付伟, 等. Cr12MoV 钢宽带激光淬火试验研究[J]. 金属热处理, 2006, 31(6): 49-51.

Yang Liuqing, Ding Yangxi, Fu Wei, et al.. Study on Cr12MoV steel with wide-band laser quenching [J]. Heat Treatment of Metals, 2006, 31(6): 49-51.

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.

Cr12钢激光表面熔凝后的性能研究

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