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《材料导报》期刊社  2017, Vol. 31 Issue (24): 133-140    https://doi.org/10.11896/j.issn.1005-023X.2017.024.027
  材料研究 |
工艺参数对304不锈钢表面激光熔覆Ni基合金涂层的组织、耐磨性及耐腐蚀性的影响
杨 丹1,宁玉恒2,3,赵宇光2,朱国斌2,徐晓峰2
1 吉林农业大学工程技术学院,长春 130118;
2 吉林大学材料科学与工程学院,汽车材料教育部重点实验室,长春 130025;
3 大唐东北电力试验研究所有限公司,长春 130012
Influence of Processing Parameter on Microstructure, Wear-resistance and Corrosion-resistance of Laser Cladding Ni-based Alloy on the Surface of 304 Stainless Steel
YANG Dan1, NING Yuheng2,3, ZHAO Yuguang2, ZHU Guobin2, XU Xiaofeng2
1 College of Engineering and Technology, Jilin Agricultural University,Changchun 130118;
2 Key Laboratory of Automobile Materials of Ministry of Education, College of Materials Science and Engineering, Jilin University, Changchun 130025;
3 Datang Northeast Electric Power Test & Research Institute, Changchun 130012
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摘要 研究了不同工艺参数对304不锈钢表面激光熔覆Ni基合金后熔覆层微观组织及硬度、耐磨、耐蚀性能的影响,并寻求最佳激光工艺参数,以期获得冶金结合较好,耐磨、耐蚀性能良好的熔覆层。根据组织与性能的综合分析可知,最优激光工艺参数为激光功率2.5 kW、扫描速度4 mm/s、送粉速率300 mg/s。利用优化工艺参数熔覆后的熔覆层宏观形貌平整、光滑,熔覆层宽度为14.36 mm,高度为1.612 mm,熔池深度为0.248 mm,稀释率为13.33,硬度较高,平均显微硬度为646.4HV,并且耐磨损性能较好,磨损量较低。此外,熔覆层的耐腐蚀性能也较好,自腐蚀电位为-286.77 mV。在一定的激光工艺参数下,组织从结合区至熔覆层表层依次为平面晶、胞状晶、柱状晶、树枝晶、等轴晶。激光功率、扫描速度、送粉速率不同,熔覆层中组织粗细变化呈现一定的规律性:随着激光功率的增大,组织由细小逐渐变的粗大;随着扫描速度的增大,组织先变细小,然后变粗大;随着送粉速率的增大,组织逐渐变细小。合金的耐磨性与耐蚀性不仅与组织大小有关,而且与组织物相组成密切相关。
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杨 丹
宁玉恒
赵宇光
朱国斌
徐晓峰
关键词:  304不锈钢  激光熔覆  工艺参数  组织结构    
Abstract: The effect of different processing parameter on the microstructure, wear-resistance and corrosion-resistance of laser cladding Ni-based alloy on the surface of 304 stainless steel was investigated. According to the analysis of the microstructure and mechanical properties, the optimized parameters were the laser power of 2.5 kW, the scanning speed of 4 mm/s and the powder feeding rate of 300 mg/s. The optimized parameters made the cladding layer smooth, and the cladding layer width was 14.36 mm, height was 1.612 mm, the depth of molten pool was 0.248 mm, and the dilution rate was 13.33. Moreover, the laser cladding made the hardness higher, and the average microhardness was 646.4HV, hence the abrasion loss was low. In addition, the corrosion resistance of cladding layer was improved, and the corrosion potential was of -286.77 mV. Under certain laser process parameters, the microstructure from the area to the cladding layer surface followed by planar crystal, the cellular crystal, columnar crystal, branches crystal and isometric crystal. Different laser power, scanning speed and feeding rate made the microstructure of cladding layer present certain regularity. With the increase of laser power, the microstructure gradually changed from fine to coarse. When scanning speed was improved, the microstructure became finer, and then turn coarse. Due to the increase of feeding rate, the microstructure gradually became finer. The wear resistance and corrosion resistance of the alloy were not only related to the size of the microstructure, but also closely related to the phase composition of the microstructure.
Key words:  304 stainless steel    laser cladding    technological parameter    microstructure
               出版日期:  2017-12-25      发布日期:  2018-05-08
ZTFLH:  TG456.7  
通讯作者:  赵宇光:男,1955年生,博士,教授,博士研究生导师,研究方向为金属基复合材料、电致强化 E-mail:zhaoyg@jlu.edu.cn 徐晓峰:男,1986年生,博士,讲师,研究方向为激光表面改性、高强耐热铝合金与合金强韧化 E-mail:xuxiaofeng@jlu.edu.cn   
作者简介:  杨丹:女,1983年生,硕士,讲师,研究方向为激光表面改性 E-mail:yangdan228@163.com
引用本文:    
杨 丹,宁玉恒,赵宇光,朱国斌,徐晓峰. 工艺参数对304不锈钢表面激光熔覆Ni基合金涂层的组织、耐磨性及耐腐蚀性的影响[J]. 《材料导报》期刊社, 2017, 31(24): 133-140.
YANG Dan, NING Yuheng, ZHAO Yuguang, ZHU Guobin, XU Xiaofeng. Influence of Processing Parameter on Microstructure, Wear-resistance and Corrosion-resistance of Laser Cladding Ni-based Alloy on the Surface of 304 Stainless Steel. Materials Reports, 2017, 31(24): 133-140.
链接本文:  
http://www.mater-rep.com/CN/10.11896/j.issn.1005-023X.2017.024.027  或          http://www.mater-rep.com/CN/Y2017/V31/I24/133
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