无限冷硬铸铁轧辊的激光表面改性

轧辊作为轧制过程中金属变形的直接工具，其质量和使用寿命至关重要。同时轧辊也是冶金企业的主要消耗部件，在轧钢生产成本中占很重的比例。使用Cr2C3+NiCr粉末，利用激光熔覆技术对镍铬无限冷硬铸铁轧辊进行了表面改性，旨在大幅度提高轧辊硬度及使用寿命。研究表明，熔覆层与基材呈良好的冶金结合，相对于基材微观组织，熔覆层组织更为致密；基材和熔覆层的平均硬度分别为506 HV和1137 HV，熔覆层的硬度提高了25%，熔覆层的耐磨性能明显提高。激光熔覆层内形成的微裂纹主要由结晶裂纹和高温低塑性裂纹组成，通过二次扫描和调整粉末化学成分可有效地减少微裂纹的形成。

Abstract

As the direct tool of metal deforming in rolling, the quality and operational life span of mill roll are of high significance. Mill roll is the main consumption component with a high ratio in steel rolling production costs. In this paper, the indefinite chilled cast-iron roller is surface-modified by laser cladding, using Cr2C3 and NiCr powder. The results indicates that, the cladding layer and base materials are a good metallurgical bond, and the microstructure of cladding layer is finer than base materials. The average microhardnesses of base materials and cladding layer are 506 HV and 1137 HV, respectively. Compared with the base material hardness, cladding layer hardness increases by 25%, so the wear resistance of the cladding layer is significantly improved. Microcrack in cldding layer includes solidification crack and low plasticity crack, and the microcrack is effectively decreased by the secondary scanning and adjusting chemical composition of the powder.

参考文献

[1] 姚成武, 黄坚. 轧辊表面激光强化与修复技术的应用现状[J]. 热加工工艺, 2007, 36(8): 69-77.

Yao Chengwu, Huang Jian. Application status of laser hardening and repairing technology on roller surface[J]. Material & Heat Treatment, 2007, 36(8): 69-77.

[2] 臧辰峰, 刘常升. 轧辊表面激光处理技术的研究进展[J]. 材料导报(综述篇), 2010, 24(2): 6-10.

Zang Chenfeng, Liu Changsheng. Research progress of laser modification techniques used on roller surface[J]. Materials Review (Review Article), 2010, 24(2): 6-10.

[3] 孙桂芳, 刘常升, 陶兴启, 等. 高镍铬无限冷硬铸铁轧辊表面激光合金化的研究[J]. 东北大学学报(自然科学版), 2008, 29(6): 845-848.

Sun Guifang, Liu Changsheng, Tao Xingqi, et al.. Research on laser alloying of high-Ni-Cr infinite chilled cast iron roller[J]. Journal of Northeastern University (Natural Science), 2008, 29(6): 845-848.

[4] 鲁建, 骆芳. 激光合金化技术提高轧辊寿命的研究[J]. 浙江冶金, 2007, (4): 41-45.

Lu Jian, Luo Fang. Research on improving roller life by laser alloying technique[J]. Zhejiang Metallurgy, 2007, (4): 41-45.

[5] 孙荣敏, 冯树强, 温宗胤, 等. 低镍铬无限冷硬铸铁轧辊激光表面合金化的工艺研究[J]. 应用激光, 2009, 29(6): 493-496.

Sun Rongmin, Feng Shuqiang, Wen Zongling, et al.. Research on laser alloying process of low-Ni-Cr infinite chilled cast iron roller[J]. Applied Laser, 2009, 29(6): 493-496.

[6] 陈长军, 张敏. 中镍铬无限冷硬铸铁轧辊激光表面强化[J]. 应用激光, 2010, 30(1): 26-31.

Chen Changjun, Zhang Min. Laser surface strengthening of medium-Ni-Cr infinite chilled cast iron roller[J]. Applied Laser, 2010, 30(1): 26-31.

[7] 侯心愿, 魏国. 激光轧辊强化技术应用[J]. 河南冶金, 2007, 15(5): 46-47.

Hou Xinyun, Wei Guo. The application of laser roller strengthens technology[J]. Henan Metallurgy, 2007, 15(5): 46-47.

[8] 宋阳, 朱世根, 渠彬, 等. 轧辊表面修复与强化的技术途径[J]. 机械设计与制造, 2005, 8: 113-115.

Song Yang, Zhu Shigen, Qu bin, et al.. Methods to repair and strengthen surface of the roll[J]. Machinery Design & Manufacture, 2005, 8: 113-115.

[9] Tong Xin, Li Fuhai, Liu Min, et al.. Thermal fatigue resistance of non-smooth cast iron treated by laser cladding with different self-fluxing alloys[J]. Optics and Laser Technology, 2010, 42(7): 1154-1161.

[10] 张国栋, 黄安国, 李志远, 等. 高镍铬无限冷硬铸铁轧辊激光相变硬化[A]. 第六届全国表面工程学术会议论文集[C]. 2006.

Zhang Guodong, Huang Anguo, Li Zhiyuan, et al.. Laser transformation hardening of high-Ni-Cr infinite chilled cast iron roller[A]. The Sixth National Conference on Surface Engineering[C]. 2006.

[11] 李朝晖. 激光表面强化技术处理轧辊的生产实践[J]. 河北冶金, 2008, (2): 29-30.

Li Zhaohui. Practice to strengthen surface of roller with laser[J]. Hebei Metallurgy, 2008, (2): 29-30.

[12] Lin Chaowen, Wang Yong, Zhang Zhe, et al.. Influence of overlapping ratio on hardness and residual stress distributions in multi-track laser surface melting roller steel[J]. Optics and Lasers in Engineering, 2010, 48(12): 1224-1230.

[13] 吴国胜, 王玉涛. 激光表面强化处理高NiCr无限冷硬铸铁轧辊材料研究[J]. 武汉工程职业技术学院学报, 2008, 20(4): 1-3.

Wu Guosheng, Wang Yutao. Laser surface hardening of high NiCr indefinite chill cast iron roll material[J]. Journal of Wuhan Engineering Institute, 2008, 20(4): 1-3.

[14] YB4052-1991,高镍铬无限冷硬离心铸铁轧辊金相检验[S]. 1991.

YB4052-1991, Metallographic test of high-Ni-Cr infinite chilled centrifugal cast iron roller[S]. 1991.

[15] 石世宏. 激光熔覆工艺与粉末对覆层开裂行为的影响[D]. 长沙: 中南大学, 1998.

Shi shihong. Influences of technology and powder in laser cladding treatment on cracking behavior of cladding layer[D]. Changsha: Central South University, 1998.

[16] 董秀花. 激光强化处理参数对轧辊表面性能的影响[J]. 包头钢铁学院学报, 2003, 22(3): 242-246.

Dong Xiuhua. Effect of parameters of laser intensify treatment process on milling roll surface properties[J]. Journal of Baotou University of Iron and Steel Technology, 2003, 22(3): 242-246.

[17] Yungchun Lee, Chengyu Chiu. Roller-based laser-assisted direct imprinting for large-area and continuous nano-fabrication[J]. Microelectronic Engineering, 2010, 87: 35-40.

[18] Janne Nurminen, Jonne Nakki, Petri Vuoristo. Mcrostructure and properties of hard and wear resistant MMC coatings eposited by laser cladding[J]. Int J Refractory Metals & Hard Materials, 2009, 27: 472-478.

陈长军, 张敏, 王晓南, 张超, 敬和民. 无限冷硬铸铁轧辊的激光表面改性[J]. 中国激光, 2013, 40(s1): s103010. Chen Changjun, Zhang Min, Wang Xiaonan, Zhang Chao, Jing Hemin. Laser Surface Modification of Indefinite Chilled Cast-Iron Roller[J]. Chinese Journal of Lasers, 2013, 40(s1): s103010.

无限冷硬铸铁轧辊的激光表面改性

关于本站 Cookie 的使用提示

全站搜索

无限冷硬铸铁轧辊的激光表面改性

相关论文

相关资讯

关于本站 Cookie 的使用提示

全站搜索