Kinetics of the austenite formation during intercritical annealing

• Autorzy: Lis J. , Lis A.
• Języki publikacji: EN

Abstrakty

EN

Purpose: of this paper is the effect of the microstructure of the 6Mn16 steel after soft annealing on the kinetics of the austenite formation during next intercritical annealing. Design/methodology/approach: Analytical TEM point analysis with EDAX system attached to Philips CM20 was used to evaluate the concentration of Mn in the microstructure constituents of the multiphase steel. Findings: The increase in soft annealing time from 1-60 hours at 625*C increases Mn partitioning between ferrite and cementite and new formed austenite and decreases the rate of the austenite formation during next intercritical annealing in the (α+γ) temperature range at 700 and 750*C. Research limitations/implications: The amount of the austenite and final multiphase microstructure can be optimised by changing the time/temperature parameters of the intercritical heating in the (α+γ) temperature range. Originality/value: The knowledge of partitioning of alloying elements mainly Mn during soft annealing is very important to optimise the processing technology of intercritical annealing for a given amount of the austenite.

Słowa kluczowe

EN

heat treatment; soft and intercritical annealing; Mn partitioning; austenite formation

PL

obróbka cieplna; tworzenie się austenitu; miękkie wyżarzanie

• Wydawca: International OCSCO World Press
• Czasopismo: Journal of Achievements in Materials and Manufacturing Engineering
• Rocznik: 2008
• Tom: Vol. 26, nr 2
• Strony: 195--198
• Opis fizyczny: Bibliogr. 15 poz., tab., wykr.

Twórcy

autor

Lis J.

autor

Lis A.

• Institute of Materials Engineering, Częstochowa University of Technology, Al. Armii Krajowej 19, 42-200 Częstochowa, Poland,

Bibliografia

• [1] A. K. Lis, J. Lis, Effect of hot deformation and cooling rate on phase transformations in low carbon HN5MVNb bainitic steel, Trans Tech Publications, Materials Science Forum 539-543 (2007) 4620-4625.
• [2] J. Lis, A. K. Lis, C. Kolan, Processing and properties of C-Mn steel with dual-phase microstructure, Journal of Materials Processing Technology 162-163 (2005) 350-354.
• [3] B. Gajda, A. K. Lis, Intercritical annealing with isothermal holding of TRIP CMnAlSi steel, Journal of Achievements in Materials and Manufacturing Engineering 20 (2007) 439-442.
• [4] N. Wolańska, A. K. Lis, J. Lis, Investigation of C-Mn-B steel after hot deformation, Archives of Materials Science and Engineering 28/2 (2007) 119-125.
• [5] A. K. Lis, B. Gajda, J. DeArdo, New steel chemistry design for TRIP and Dual Phase structures, Materials Science and Technology 2005, Pittsburgh, USA.
• [6] S. K. Chang, J. H. Kwak, Effect of Manganese on Aging in Low Carbon Sheet Steels, ISIJ International 37 (1997) 74-79.
• [7] K. Eberle, P. Cantinieaux, P. Harlet, New thermomechanical strategies for the production of high strength low alloyed multiphase steel showing a TRIP effect, Steel Research 70/6 (1999) 233-238.
• [8] G. Michta, J. Pietrzyk, W. Osuch, A. Kruk, Stability of retained austenite at low temperature in low carbon cooper bearing steels with TRIP assisted effect, Materials Engineering (2003) 339-342 (in Polish).
• [9] G. Michta, W. Osuch, A. Kruk, Testing of isothermal tranformation of undercooled austenite within 380-650oC temperature range in low carbon steels with containing manganese and silicon, Metallurgist, 4 (2003) 171-176 ( in Polish).
• [10] S. Sun, M. Pugh, Manganese partitioning in dual phase steel during annealing, Materials Science and Engineering A276 (2000) 187-174.
• [11] J. Lis, J. Morgiel, A. Lis, The effect of Mn partitioning in Fe-Mn-Si alloy investigated with STEM-EDS techniques, Materials Chemistry and Physics 81 (2003) 466-468.
• [12] J. Lis, Microsegregation of manganese in low carbon steels during intercritical heat treatments, Publisher WIPM and FS, Częstochowa University of Technology, Seria: Materials Engineering 7, Częstochowa, 2005 (in Polish).
• [13] Z. Kędzierski, Phase transformations in condensed systems, Academia Publisher AGH, Krakow, 2003 (in Polish).
• [14] G. Guy, Introduction to Materials Science, PWN, Warsaw, 1970 (in Polish).
• [15] J. Pietrzyk, G. Michta, A. Kruk, Kinetics of bainite transformation of austenite formed after annealing in temperature range A1-A3 in steel 0,2 %C, 1,5 %Mn, 1,5 %Si, Metallurgist 5 (1997) 218-222 (in Polish).