快速凝固技术是改善高铬钢表面性能的有效手段,其中激光熔凝处理最为简单经济.过去,对采用激光熔凝处理来提高材料耐蚀性的报道不多,为此,采用5 kW横流CO2激光器对高铬钢进行熔凝强化处理,借助电化学测试、扫描电镜等方法研究了高铬钢激光熔凝处理后的显微组织及耐蚀性能.结果表明:高铬钢的表面腐蚀始于碳化物与基体交界处,导致基体腐蚀严重,大量碳化物暴露于表面;激光熔凝处理明显改善了高铬钢的组织形态,使其晶粒细化,碳化物完全溶解,碳及合金元素固溶于奥氏体枝晶中,耐蚀性明显提高,腐蚀表面均匀平整.
A 5 kW continuous CO2 laser sys-tem was performed for laser surface melting of high chrome steel.The microstructure and corrosion resistance of the laser surface melting modified layer were analyzed by using it scanning electron microscope and an electrochemical test rig. Results show that the high chrome steel experienced initial corrosion attack at the boundary of the carbides and matrix, leading to severe corrosion of the matrix and exposure of a large amount of carbides on the corroded surface. Laser surface melting obviously modified the structure of the as- received steel, leading to the refined grains,complete dissolution of reticular carbides, as well as solid solu-tion of C and alloying elements in austenite dendrites. The corro-sion resistance of steel increased.
参考文献
| [1] | 姚宁娟,陆伟,陈铠,左铁钏.激光熔覆技术制造热轧辊的钴基合金层研究[J].中国激光,2003(08):759-762. |
| [2] | F.J. Perez;L. Martinez;M.P. Hierro;C. Gomez;A.L. Portela;G.N. Pucci;D. Duday;J. Lecomte-Beckers;Y. Greday .Corrosion behaviour of different hot rolled steels[J].Corrosion Science: The Journal on Environmental Degradation of Materials and its Control,2006(2):472-480. |
| [3] | 赵玉珍,王维斌,史耀武,沈莲.高碳高合金钢的激光表面熔凝处理的耐磨性研究[J].材料工程,2003(02):37-40. |
| [4] | 李美艳,王勇,韩彬,韩涛,程义远.高铬钢轧辊激光熔凝层组织及性能[J].中国激光,2009(02):498-502. |
| [5] | 潘邻,高万振,潘春旭,陶锡麒,夏春怀.激光熔覆层与等离子喷焊层凝固组织对比及界面特征[J].材料热处理学报,2006(03):104-107. |
| [6] | Lalvani S B;Zhang G .The corrosion of carbon steel in a chloride environment due to periodic voltage modulation:Part I[J].Corrosion Science,1995,37(10):1567-1582. |
| [7] | Kwok CT.;Lo KH.;Cheng FT.;Man HC. .Effect of processing conditions on the corrosion performance of laser surface-melted AISI 440C martensitic stainless steel[J].Surface & Coatings Technology,2003(2/3):221-230. |
| [8] | 尚丽娟;葛景岩;宋长琴 .稀土元素在金属表面处理中的应用[J].沈阳工业大学学报,1998,20(06):30-33. |
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