The effect of chemical composition on microstructure and properties of TRIP steels

• Autorzy: Kučerová L. , Bystrianský M.
• Języki publikacji: EN

Abstrakty

EN

Purpose: Various alloying strategies can be used to produce advanced high strength steels and this work offers comparison of results achieved for four different low alloyed steels with 0.2-0.4 %C, 0.5-2 %Si, 0.6-1.5 %Mn, 0.03-0.06 %Nb and with 0.8-1.33 %Cr. Microstructures obtained by two methods of thermo-mechanical treatment were analysed for each steel and compared with theoretical predictions of TTT (time temperature transformation) diagrams calculated by JMatPro. Design/methodology/approach: Thermo-mechanical treatment of all steels was carried out at thermo-mechanical simulator. Resulting microstructures were analyses by the means of scanning electron microscopy, mechanical properties were measured by tensile test. Findings: It was found out that microstructures typical for TRIP (transformation induced plasticity) steels can be obtained easily for low carbon steels alloyed by silicon or aluminium-silicon and micro-alloyed by niobium. Chromium addition influenced austenite decomposition causing intensive pearlite formation in low carbon steel and predominantly martensitic microstructure in middle carbon steel. These microstructures were not in agreement with calculated TTT diagrams. Research limitations/implications: To obtain ferritic-bainitic microstructure with retained austenite typical for TRIP steels, chromium alloyed steels require substantial optimisation of processing parameters. This issue should be addressed in future work. Practical implications: JMatPro software is well equipped to calculate TTT diagrams for steels alloyed by manganese, silicon and niobium, however further chromium addition changed behaviour of the steel in a way that the software was not able to predict. Originality/value: Obtained results could be useful for consideration of chemical composition of low alloyed steels with respect to resulting microstructures and properties.

Słowa kluczowe

EN

materials; metallic alloys; TRIP steels; alloying elements; retained austenite

PL

materiały; stopy metali; stale TRIP; dodatki stopowe; austenit szczątkowy

• Wydawca: International OCSCO World Press
• Czasopismo: Journal of Achievements in Materials and Manufacturing Engineering
• Rocznik: 2016
• Tom: Vol. 77, nr 1
• Strony: 5--12
• Opis fizyczny: Bibliogr. 16 poz., rys., tab.

Twórcy

autor

Kučerová L.

• UWB in Pilsen, Universitni 8, 30614 Pilsen, Czech Republic

autor

Bystrianský M.

• UWB in Pilsen, Universitni 8, 30614 Pilsen, Czech Republic

Bibliografia

• [1] Z.P Xiong, A.G. Kostryzhev, L. Chen, E.V Pereloma, Microstructure and mechanical properties of strip cast TRIP steel subjected to thermo-mechanical simulation, Materials Science and Engineering A 677 (2016) 356-366.
• [2] A. Grajcar, R. Kuziak, W. Zaleck, Third generation of AHSS with increased fraction of retained austenite for the automotive industry, Archives of Civil and Mechanical Engineering 12/3 (2012) 334-341.
• [3] H.R. Ghazvin Loo, A. Honarbakhsh-Raouf, Mechanical properties of a high Si and Mn steel heat treated by one-step quenching and partitioning, Journal of Achievements in Materials and Manufacturing Engineering 67/2 (2014) 65-72.
• [4] F.T. Lischka, C.A.S. de Oliveira, The study of TRIP effect in an austenitic stainless steel AISI 304, Journal of Achievements in Materials and Manufacturing Engineering 71/1 (2015) 34-38.
• [5] M.K. Hatami, T. Pardoen, G. Lacroix, P. Berke, P.J. Jacques, T.J. Massart, Towards ultra-high ductility TRIP-assisted multiphase steels controlled by strain gradient plasticity effects, Journal of the Mechanics and Physics of Solids 98/1 (2017) 201-221.
• [6] A. Grajcar, Hot-working in the + region of TRIPaided microalloyed steel, Archives of Materials Science and Engineering 28/12 (2007) 743-750.
• [7] E.V. Pereloma, F. Al-Harbi, A. Gazder, The crystallography of carbide-free bainite in thermomechanically processed low Si transformation induced plasticity steels, Journal of Alloys and Compounds, 615 (2014) 96-110.
• [8] J. Wang, Q. Yang, X. Wang, L. Wang, Microstructure and mechanical properties of strip cast TRIP steel subjected to thermo-mechanical simulation, Materials Science and Engineering A 667 (2016) 356-366.
• [9] O. Feng, L. Li, W. Yang, Z. Sun, Microstructures and mechanical properties of hot-rolled Nb-microalloyed TRIP steels by different thermo-mechanical processes, Materials Science and Engineering A 605 (2014) 14-21.
• [10] K. Chiang, K.D. Boyd, A.K. Pilkey, Effect of microstructure on retained austenite stability and tensile behaviour in an aluminum-alloyed TRIP steel, Materials Science and Engineering A 638 (2015) 132-142.
• [11] M. Opiela, A. Grajcar, K. Gołombek, The influence of hot-working conditions on the structure and mechanical properties of forged products of microalloyed steel, Archives of Materials Science and Engineering 59/1 (2013) 28-39.
• [12] A Grajcar, P Skrzypczyk, D Woźniak, S Kołodziej, Semi-industrial simulation of hot rolling and controlled cooling of Mn-Al TRIP steel sheets, Journal of Achievements in Materials and Manufacturing Engineering 57/1(2013) 38-47.
• [13] L. Kučerová, H. Jirková, B. Mašek, Influence of Nb Micro-alloying on TRIP Steels Treated by Continuous Cooling Process, Manufacturing Technology 16/1 (2016)145-149.
• [14] K.I. Sugimoto, T. Muramatsu, S.I. Hashimoto, Y. Mukai, Formability of Nb bearing ultra highstrength TRIP-aided sheet steels, Journal of Materials Processing Technology 177 (2016) 390-395.
• [15] H. Jirková, L. Kučerová, B. Mašek, The Effect of Chromium on Microstructure Development during Q-P Process, Materials Today: Proceedings (2015) 627-630.
• [16] L. Kuerová, H. Jirková, B. Mašek The effect of alloying on mechanical properties of advanced high strength steels, Archives of Metallurgy and Materials 59/3 (2014) 1189-1192.