C-N-O-S multi-element co-infiltration and evolution of microstructure and properties of Q235 steel for leveling gaskets of extra-large railway steel beam bridges

doi:10.13251/j.issn.0254-6051.2024.05.044

Abstract

Abstract: In order to effectively extend the service life of Q235 steel beam bridge leveling gaskets, the surface modification of C-N-O-S multi-element infiltration technology was carried out. The effect of different parameters coupling on the microstructure, hardness, wear resistance and weather resistance of the modified layer was studied. The results show that the multi-layer structure of the modified layer is related to co-infiltration temperature, and there is a critical value between 640 ℃ and 650 ℃, below the critical temperature, it is composed of the compound layer, diffusion layer and oxidation layer. When the critical temperature is exceeded, the modified layer comprises compound and oxidation layers. The thickness of the modified layer is affected by co-infiltration temperature, ammonia and infiltration promoting agent flow rates, and the temperature and ammonia flow rate affect the structure of each layer. The infiltration promoting agent flow rate has an obvious effect on the diffusion layer. The hardness of the modified layer is 2-3 times of that of the substrate, the hardness of the three-layer structural layer decreases continuously from the surface to substrate. The hardness of the two-layer structural compound layer is uniform, with sharp decrease in hardness in the interface area. The lowest friction coefficient of the modified layer is 0.2468, which is about 1/3 of the base material. The highest free-corrosion potential of the modified layer is -0.4845 V, and the lowest free corrosion current density is 1.187×10^-6 mA/cm², which is reduced by 2 orders of magnitude compared to the substrate.

Key words: leveling steel gaskets for railway steel beam bridge, service life, multi-element co-infiltration, microstructure and properties

CLC Number:

Zhang Minmin, Wang Diantang, Li Jiangtao, Wang Zhongjun, Zhang Jibing, Zhang Qiang,Wei Shengmin, Zhang Qi, Li Jianguo. C-N-O-S multi-element co-infiltration and evolution of microstructure and properties of Q235 steel for leveling gaskets of extra-large railway steel beam bridges[J]. Heat Treatment of Metals, 2024, 49(5): 260-266.

References

[1]Abutorabian E, Dehkordi M R. Numerical study of seismic response of irregular multi-frame reinforced concrete bridges[J]. Proceedings of the Institution of Civil Engineers, 2021, 173(11): 783-789.
[2]Sajed M, Tehrani P. Investigating the effects of combinations of irregularities on seismic ductility demands and mean response for four-span RC bridges considering displacement direction[J]. Bridge Structures, 2020, 16: 105-117.
[3]Maleki-amin M J, Maalek K S. Regularity classification and corresponding analysis method requirements of horizontally curved bridges with unequal pier heights[J]. Earthquake Engineering and Engineering Vibration, 2023, 22(2): 549-571.
[4]禚一, 王旭, 张军. 高速铁路沉降自动化监测系统SMAIS的研发及应用[J]. 铁道工程学报, 2015, 32(4): 10-15.
Zhuo Yi, Wang Xu, Zhang Jun. Development and application of automatic monitoring system SMAIS for settlement of high-speed railway[J]. Journal of Railway Engineering Society, 2015, 32(4): 10-15.
[5]Sim S, Cole I S, Bocher F, et al. Investigating the effect of salt and acid impurities in supercritical CO₂ as relevant to the corrosion of carbon capture and storage pipelines[J]. International Journal of Greenhouse Gas Control, 2013, 17: 534-541.
[6]姜军, 王军阳, 金武俊, 等. 带肋钢腐蚀及其防腐蚀技术研究进展[J]. 中国腐蚀与防护学报, 2021, 41(4): 339-449.
Jiang Jun, Wang Junyang, Jin Wujun, et al. Research progress on corrosion and anti-corrosion technology of ribbed steel[J]. Journal of Chinese Society for Corrosion and Protection, 2021, 41(4): 339-449.
[7]Yuan W Y, Li R F, Chen Z H, et al. A comparative study on microstructure and properties of traditional laser cladding and high-speed laser cladding of Ni45 alloy coatings[J]. Surface and Coatings Technology, 2020, 405(12): 65-82.
[8]Ren X, Zhao R S, Wang W, et al. Corrosion resistance of TiCN films prepared with combining multi-arcion plating and magnetron sputtering technique[J]. Rare Metal Materials and Engineering, 2018, 47(7): 2028-2036.
[9]Krellina P, Almeida E A S, Milan J C G, et al. Microstructural and tribological characterization of niobium boride coating produced on AISI 1020 steel via multicomponent boriding[J]. Materials Research Express, 2020, 7(2): 026413.
[10]Wu D, Kahn H, Dalton J C, et al. Orientation dependence of nitrogen supersaturation in austenitic stainless steel during low-temperature gas-phase nitriding[J]. Acta Materialia, 2014, 79: 339-350.
[11]蒋小龙. 50CrVA钢亚温淬火和多元共渗复合工艺及组织性能探索[D]. 成都: 西南交通大学, 2012.
[12]杨强云. 新型高耐腐蚀、高抗疲劳、高强紧固件工艺探究与组织性能分析[D]. 成都: 西南交通大学, 2016.
[13]章敬保. Fe-N化合物与复合处理层抗腐蚀机理及纽织性能研究[D]. 成都: 西南交通大学, 2017.
[14]Chen X, Wang Y, Xie W Z, et al. Fabrication and corrosion resistance of super-thick compound layer by austenitic gas oxynitrocarburizing[J]. Journal of Alloys and Compounds, 2018, 765: 1099-1110.
[15]Zhang J W, Lu L T, Cui G D, et al. Effect of process temperature on the microstructure and properties of gas oxynitrocarburized 35CrMo alloy steel[J]. Materials & Design, 2010, 35(5): 2654-2658.
[16]Kucharska B, Michalski I J, Wojcik G. Mechanical and microstructural aspects of C20-steel blades subjected to gas nitriding[J]. Archives of Civil and Mechanical Engineering, 2019, 19(1): 147-156.
[17]张鹏飞. 低温气体多元共渗超厚化合物层工艺组织性能及应用研究[D]. 成都: 西南交通大学, 2016.
[18]Gronostajski Z, Widomask P, Kaszuba M, et al. Influence of the phase structure of nitrides and properties of nitrided layers on the durability of tools applied in hot forging processes[J]. Journal of Manufacturing Processes, 2020, 52: 247-262.
[19]廖斌, 刘晗, 范琪, 等. 42CrMo钢离子氮碳氧多元共渗及动力学分析[J]. 材料热处理学报, 2016, 37(8): 184-188.
Liao Bin, Liu Han, Fan Qi, et al. Plasma oxynitrocarburising of 42CrMo steel and kinetics analysis[J]. Transactions of Materials and Heat Treatment, 2016, 37(8): 184-188.
[20]Sree K R, Reddy G K, Prasanna G L, et al. Dry sliding wear behavior of treated AISI 304 stainless steel by gas nitriding processes[J]. Materials Today Proceeding, 2021, 44: 1406-1411.
[21]李毅丰, 柴均博, 李赛鹏, 等. 催渗剂对O-N-C多元共渗Q235钢耐蚀性的影响[J]. 金属热处理, 2013, 38(1): 80-83.
Li Yifeng, Chai Junbo, Li Saipeng, et al. Effect of additives on corrosion resistance of Q235 steel by oxynitrocarburizing[J]. Heat Treatment of Metals, 2013, 38(1): 80-83.
[22]章敬保, 杨川, 张程菘, 等. 气体氮化对碳钢耐蚀性的影响及化合物层的价电子理论分析[J]. 腐蚀与防护, 2018, 39(3): 207-212.
Zhang Jingbao, Yang Chuan, Zhang Chengsong, et al. Effect of gas nitriding on the corrosion resistance of carbon steel and empirical electron theory analysis of compound layer[J]. Corrosion and Protection, 2018, 39(3): 207-212.