应用激光熔覆法,采用镍基NiCrSiB粉末,在20~#钢表面制备了熔覆涂层,并用激光重熔涂层.观察了熔覆-重熔层的形貌,检测了其相组成和高温耐磨性能,结果表明:所制得熔覆-重熔层组织均一、致密,与基体形成了良好的冶金结合;经重熔处理后,熔覆层表面的裂纹显著减少;熔覆-重熔层的硬度提高到基体的5倍,高温磨损率约为基体的1/3.熔覆-重熔层耐磨能力的增强除因其与基体形成了良好的冶金结合和硼化物、硼碳化物等析出相的强化作用外,也是重熔减少微裂纹的结果.
Ni-based alloy laser cladding layer and laser cladding-remelting layer were made on surface of 20 steel specimens using NiCrSiB powder. Phase characteristics, high temperature abrasive-wear behavior and surface morphologies after abrasive-wearing of the layers were investigated and the results show that laser cladding-remelting layer has dense microstructure, and has metallurgical combination with 20 steel substrate. There is much less cracks in laser cladding-remelting layer after remelting process. Micro-hardness and high temperature abrasive-wearing resistance of laser cladding layer are 5 and 3 times of 20 steel specimen separately. The improvement in high temperature abrasive-wearing resistance of the layer is due to the metallurgical combination; Strengthen effects of borides and boron-carbides precipitate phases and less harmful cracks.
参考文献
| [1] | 刘常升;才庆魁.激光表面改性与纳米材料制备[M].沈阳:东北大学出版社,2001 |
| [2] | Yukio Fujii;Kikuo Maeda .Flaking failure in rolling contact fatigue caused by indentations on mating surface (I) reproduction of flaking failure accompanied by cracks extending bi-directionally relative to the load-movement[J].Wear: an International Journal on the Science and Technology of Friction, Lubrication and Wear,2002(9/10):787-798. |
| [3] | Chiu KY;Cheng FT;Man HC .Laser cladding of austenitic stainless steel using NiTi strips for resisting cavitation erosion[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2005(1/2):126-134. |
| [4] | Sun S;Durandet Y;Brandt M .Parametric investigation of pulsed Nd : YAG laser cladding of stellite 6 on stainless steel[J].Surface & Coatings Technology,2005(2/3):225-231. |
| [5] | Francois Brygo;Ch. Dutouquet;F. Le Guern;R. Oltra;A. Semerok;J.M. Weulersse .Laser fluence, repetition rate and pulse duration effects on paint ablation[J].Applied Surface Science: A Journal Devoted to the Properties of Interfaces in Relation to the Synthesis and Behaviour of Materials,2006(6):2131-2138. |
| [6] | Yakimets I;Richard C;Beanger G et al.Lair peening processing effect on mechanical and tribological properties of rolling steel 100Cr6[J].Wear,2004,256(3,4):311-320. |
| [7] | 周尧和;胡壮麒;介万奇.凝固技术[M].北京:机械工业出版社,1998 |
| [8] | D. Du;Y.F. He;B. Sui .Laser texturing of rollers by pulsed Nd:YAG laser[J].Journal of Materials Processing Technology,2005(3):456-461. |
| [9] | Zhang D W;Lei T C;Zhang J G et al.The effects of heat treatment on microstructure and erosion properties of laser surface-clad Ni-base alloy[J].Surface and Coatings Technology,1999,115(2,3):176-183. |
| [10] | Wang B Q;Geng G Q;Levy A V.Effect of microstructure on the erosion-corrosion of steels[J].Wear of Materials,1991(01):129-136. |
| [11] | 徐成伟,姜伟,胡芳友.稀土元素和工艺参数对激光熔覆层微观形貌的影响[J].表面技术,2009(03):58-60. |
| [12] | Div M G;Cuppari;Souza R M et al.Effect of hard second phase on cavitation erosion of Fe-Cr-Ni-C alloys[J].Wear,258:596-603. |
| [13] | 佗劲红,陈岁元,周利,刘常升,李慧利.激光表面改性对轧辊用高速钢组织与硬度的影响[J].金属热处理,2006(01):56-59. |
| [14] | 张林,张彩碚.材料凝固时晶粒生长-粗化的二维元胞自动机模型[J].东北大学学报（自然科学版）,2007(02):217-220. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%