Investigation of Thermomechanical Processing of Nb Microalloyed Steel Produced by Powder Metallurgy

Year 2022, , 606 - 616, 01.06.2022

Demet Taştemür , Süleyman Gündüz , Mehmet Akif Erden

https://doi.org/10.35378/gujs.835371

Abstract

One of the most important properties of microalloyed steels is the different microstructures which are obtained by changing the thermomechanical processing parameters and steel composition. The control of microstructure such as grain size, precipitates, dislocation structure and inclusions are highly effective to determine the mechanical properties of microalloyed steels. The strengthening of mechanical properties can be done by thermomechanical processesing due to increase of nucleation sides via maximizing the austenite boundary and density of the deformation band. In this study, the unalloyed steel and microalloyed steel containing 0.15% Nb were produced by powder metallurgy and hot deformed to reduce the thickness by 40% and 75%. EDX analyzes, density, hardness and grain size measurements were also performed on specimens. According to the SEM microstructure results, the grain size gradually decreased with respect to the deformation rate in both steels. It was observed that small grains occurred due to a complete recrystallization process at 75% deformation rate which were supported by grain size analysis. The density and hardness values increased by the increase in deformation rate. While the density and hardness of microalloy steel under sintered conditions was 89.46% and 75 Hv, respectively, 75% deformed condition was 98.51 % and 231 Hv.

Keywords

Microalloyed steel, Powder metallurgy, Thermomechanical, Processing, Mechanical properties

Project Number

FDK-2020-2318.

References

• [1] Shanmugam, S., Misra, R., Mannering, T., Panda, D. and Jansto, S., “Impact toughness and microstructure relationship in niobium and vanadium-microalloyed steels processed with varied cooling rates to similar yield strength”, Materials Science and Engineering: A, 437(2), (2006).
• [2] Tamura, I., Ouchi, C., Tanaka, T. and Sekine, H., “Thermomechanical Processing of High-Strength Low-Alloy Steels”, Butterworths, Cornwall, (1988).
• [3] Gladman, T, “The Physical Metallurgy of Microalloyed Steels. Cambridge: The Institute of Materials”, University Press, (1997).
• [4] Opiela, M., “Effect of thermomechanical processing on the microstructure and mechanical properties of Nb-Ti-V Microalloyed”, Journal of Materials Engineering and Performance, 23: 3379-3388, (2014).
• [5] Eghbali, E. and Abdollah-Zadeh, A., “Influence of Deformation Temperature on the Ferrite Grain Refinement in a Low Carbon Nb-Ti Microalloyed Steel”, Journal of Materials Processing Technology, 180: 44–48, (2006).
• [6] Grajcar, S.L., “Effect of Nb Microaddition on a Microstructure of Low- Alloyed Steels with Increased Manganese Content”, Materials Science Forum., 706-709: 2124–2129, (2012).
• [7] Skobir, D.,“High-Strength Low-Alloy (HSLA) Steels”, Materials and Technology, 45: 295–301, (2011).
• [8] Ghosh, A., Das, S., Chatterjee, S., Mishra, B., Ramachandra Rao, P, “Influence of thermo-mechanical processing and different post-cooling techniques on structure and properties of an ultra low carbon Cu bearing HSLA forging”, Materials Science and Engineering: A, 348 (1–2): 299–308, (2003).
• [9] Zhao, M.C., Yang, K., Shan, Y., “The effects of thermo-mechanical control processon microstructures and mechanical properties of a commercial pipeline steel”, Materials Science and Engineering: A, 335 (1–2): 14–20, (2002).
• [10] Devesh, M., Jansto, S.G., “Niobıum-Based Alloy Design For Structural Applıcations: Processing-Structure-Property Paradigm,” The Chinese Society for Metals (CSM) and Chinese Academy of Engineering (CAE) TMS, (2016).
• [11] Gündüz, S., Erden, M.A., Karabulut, H., Türkmen, M., “Effect of the addition niobium and aluminium on the microstructure and mechanical properties of the micro-alloyed PM steels”, Materials and Technology, 50: 641–648, (2016).
• [12] Özdemirler D., Gündüz S., Erden M.A., “Influence of NbC Addition on the Sintering Behaviour of Medium Carbon PM Steels”, Metals, 7: 121, (2017).
• [13] Kannan, R., Shanmugam, S., Narayanasamy, R., “Deformation behaviour of sintered high carbon alloy powder metallurgy steel in powder preform forging”, Materials & Design, 29: 1862–1867, (2008).
• [14] Maslyuk, V.A., Orlova, L.N., Kud, V.K., Grabchak, A.K., Mamonova, A.A., Skuratovskii, A.K., “Theory, process technology, articles forming hot-forged wear-resistant powder meterials based on stainless steels of the austenitic class”, Powder Metallurgy and Metal Ceramics, 45: 20–27, (2006).
• [15] James, W.B., Products, P.F., Corporation, H., Road, R., Lane, T., “New Shaping Methods for Powder Metallurgy Components”, Materials & Design, 8: 187–197, (1987).
• [16] Torralba, J.M.,“Improvement of Mechanical and Physical Properties in Powder Metallurgy”, Material Science and Materials Engineering, 3: 281¬294, (2014).
• [17] Türkmen, M., “Effect of carbon content on microstructure and mechanical properties of powder metallurgy steels,” Powder Metallurgy and Metal Ceramics, 55: 3-4, (2016).
• [18] Erden, M.A., Barlak, S., Adalı, B., Çelikkıran, Ö., “The Effect On Microstructure Mechanical Properties of Vanadium in Nb-V Microalloyed Steel Produced by Powder Metallurgy”, Düzce University Journal of Science & Technology, 6: 629¬636, (2018).
• [19] Tripathy, A., Sarangi, S.K., Chaubey, A.K., “A Review of Solid State Processes in Manufacture of Functionally Graded Materials”, International Journal of Engineering & Technology, 7: 4-39, (2018).
• [20] Zhao, J., Lee, J.H., Kim, Y.W., Jiang, Z., Lee, C.S., “Enhancing mechanical properties of a low-carbon microalloyed cast steel by controlled heat treatment”, Materials Science and Engineering: A, 559: 427–35, (2013).
• [21] Gladman, T, “The Physical Metallurgy of Microalloyed Steels. Cambridge: The Institute of Materials”, University Press, (1997).
• [22] Ollilainen, V., Kasprzak, W., Hollapa, L., “The effect of slicon, vanadium and nitrogen on the microstructure and hardness of air-cooled medium carbon low alloy steel”, Journal of Materials Processing Technology, 134: 405-412, (2003).
• [23] Xiang-done, H., Xin-ping, M., Sheng-xia, L., “Effect of annealing temperature on recrystallization behavior of cold rolled Ti-microalloyed steel”, Journal of Iron and Steel Research International, 20(9): 105-110, (2013). [24] Shukla, A., K., Singh, P., Vardhan, M., “A two-stage gene selection method for biomarker discovery from microarray data for cancer classification”, Chemometrics and Intelligent Laboratory Systems, 183: 47-58, (2018).
• [25] Dutta B., Sellars C. M., “Strengthening of austenite by niobium during hot rolling of microalloyed steel”, Materials Science and Technology, 2: 146–153, (1986).
• [26] Sage, A. M., “An overview of the use of micro alloys in hsla steels with particular reference to vanadium and titanium, processing, properties and applications”, Proceedings of the Second International Conference on HSLA Steels, 51-61, (1992).
• [27] Campos, S.S., Kestenbach, H.J., Morales, E. V., “On strenghening mechanisms in commercial Nb-Ti hot strip steels”, Metallurgical and Materials Transactions A, 32A: 245-1248, (2001).
• [28] Korczynsky, M., “Microalloying and thermo-mechanical treatment. In Proceedings of the International Symposium on Microstructure and Properties of HSLA Steels’’, Pittsburgh, PA, USA, 3–5: 169–201, (1987).
• [29] Kostryzhev, A.G, Al Shahrani, A., Zhu, C., Cairney, J.M., Ringer, S.P., Killmore, C.R., “Effect of niobium clustering and precipitation on strength of an NbTi-microalloyed ferritic steel”, Materials Science and Engineering: A, 607: 226–235, (2014).
• [30] Erden, M.A., Gündüz, S., Türkmen, M., Karabulut, H., “Microstructural characterization and mechanical properties of microalloyed powder metallurgy steels”, Materials Science and Engineering: A, 616: 201–206, (2014).
• [31] Guang, X., Xiaolong, G., Guojun, M., Feng, L., Hang, Z., “The development of Ti alloyed high strength microalloy steel”, Materials & Design, 31: 2891–2896, (2010).
• [32] Chokkalingam, B., MohamedNazirudeen, S.S., Ramakrishnan, S.S., "Investigation into the mechanical properties of Micro-alloyed as-cast steel", Materials and Technology, 45: 159–162, (2011).
• [33] Erden, M.A., “The Effect of the Sintering Temperature and Addition of Niobium and Vanadium on the Microstructure and Mechanical Properties of Microalloyed PM Steels”, Metals, 7: 329, (2017).
• [34] Erden, M.A., “The Effect of Sintering Time on Tensile Strength of NB-V Microalloyed Powder Metallurgy Steels”, E-Journal of New World Sciences Academy, 15, 15–22, (2020).
• [35] Sarıtaş, S., Türker, M, Durlu, N., “Powder metallurgy and particulate material processes”, Turkish Powder Metallurgy Publications, Ankara, (2007).