Microstructures and Properties of Chromaluminized Layer on 40Cr Steelby Induction Heating
HU Jianjun1,2, ZHANG Yuqing1, GUO Ning3, YANG Xian1, LI Hui1, JIN Yan2
1 College of Material Science and Engineering, Chongqing University of Technology, Chongqing 400054 2 Mould Technology Chongqing Municipal Key Laboratory of Institutions of Higher Education, Chongqing 400054 3 Faculty of Materials and Energy, Southwest University, Chongqing 400715
Abstract: Chromaluminized layer was prepared by electromagnetic induction heating on the surface of the 40Cr steel. The microstructures and properties were carried out and compared with the traditional box type furnace. The difference between both processes and the mechanism of induction heating chromaluminizing were discussed. The results show that, the above two processes produced different phases. The induction heating layer is mainly composed of FeCr phase, while the box type furnace heating layer mainly presents FeAl phase and has more oxides. Induction heating has faster diffusion rate and thicker layer depth which is about 362 μm, and the bonding part between the layer and substrate is alloy pearlite accompanied by carbon deficiency. However, the thickness of the box type furnace layer is only 20 μm, and there is a rich carbon zone at the interface of the substrate and layer. Both chromaluminized layers can improve the corrosion resistance in the mixed aqueous solution of H2SO4 and Na2SO4. Induction heating chromaluminized layer also indicates an improved corrosion resistance in NaCl compared with the box type furnace sample and substrate.
1 Hu J J, Ma C C, Xu H B, et al. Science and Technology of Nuclear Installations, DOI:10.1155/2016/5852328. 2 Ke W, Gao N W, Li M, et al. Journal of NanJing Tech University (Natural Science Edition), 2010, 32(6), 45(in Chinese). 柯威, 高能文, 李梅, 等. 南京工业大学学报(自然科学版), 2010, 32(6), 45. 3 Guo C J, Chen J S, Li J J, et al.Heat Treatment of Metals, 2017, 42(5), 108(in Chinese). 郭诚君, 陈金水, 李家节, 等. 金属热处理, 2017, 42(5), 108. 4 Sheng C S, Li X T, Chao J R, et al.Corrosion & Protection in Petrochemical Industry, 2010, 27(6), 52(in Chinese). 盛长松, 李选亭, 晁君瑞, 等. 石油化工腐蚀与防护, 2010, 27(6), 52. 5 Li W C. Studies on formation and oxidantion behavior of Al-Cr alloy coa-ting. Master's Thesis, Zhejiang University, China, 2011 (in Chinese). 李文川. Al-Cr合金涂层的制备及氧化行为研究. 硕士学位论文, 浙江大学, 2011. 6 Jin P, Xu G, Tazawa M, et al. Journal of Vacuum Science & Technology A Vacuum Surfaces & Films, 2002, 20(6), 2134. 7 Wu D L, Jiang S M, Fan Q X, et al. Acta Metallurgica Sinica, 2014, 50(10), 1170(in Chinese). 吴多利, 姜肃猛, 范其香, 等. 金属学报, 2014, 50(10), 1170. 8 Li J H.Heavy Castings and Forgings, 2004(1), 50(in Chinese). 李旌海. 大型铸锻件, 2004 (1), 50. 9 Zhang R M.Industrial Furnace, 2000, 22(4), 15(in Chinese). 张汝淼. 工业炉, 2000, 22(4), 15. 10 Zhang J X, Zhang G L.Heat Treatment, 2011, 26(6), 21(in Chinese). 张家雄, 张国梁. 热处理, 2011, 26(6), 21. 11 Zhao M, Xu L F, Chen F.China Metal Forming Equipment & Manufacturing Technology, 2006, 41(3), 33(in Chinese). 赵敏, 许雷峰, 陈峰. 锻压装备与制造技术, 2006, 41(3), 33. 12 Hu J J, Ma C P, Yang X, et al. Journal of Materials Engineering and Performance, 2017, 26(11), 5530. 13 Zeng M Q, Meng J L.Heat Treatment of Metals, 2000(8), 18(in Chinese). 曾美琴, 蒙继龙. 金属热处理, 2000(8), 18. 14 Tong F L. The study on high temperature oxidation resistance of coating on GH586 nickel base superalloy prepared by pack cementation process. Master's Thesis, Jiangsu University, China, 2017 (in Chinese). 童福利. GH586镍基高温合金包埋渗涂层的抗高温氧化性能研究. 硕士学位论文, 江苏大学, 2017. 15 Godlewska E, Godlewski K. Oxidation of Metals, 1984,22,117. 16 Medyukh R M, Medyukh V K, Uvarova I V. Powder Metallurgy & Metal Ceramics, 2018, 56(1), 1. 17 Chi C Z. Research of middle temperature chromizing on carbon steel with double glow plasma surface alloying process and carbon migration in the chromized layer. Ph.D. Thesis, Taiyuan University of Technology, China, 2004 (in Chinese). 池成忠. 碳钢表面中温双辉等离子渗铬合金化及渗层中碳迁移的研究. 博士学位论文, 太原理工大学, 2004. 18 Hu J J, Zhang Y Q, Yang X, et al. Surface & Coatings Technology, 2018, 344, 656. 19 Gao X X, Guo J Z, Zhang H B.Materials Review B:Research Papers, 2017, 31(3), 93(in Chinese). 高心心, 郭建章, 张海兵. 材料导报:研究篇, 2017, 31(3), 93.