PRECIPITATION BEHAVIOR OF (Nb, Ti)C IN COILING PROCESS AND ITS EFFECT ON MICRO-MECHANICAL CHARACTERISTICS OF FERRITE

doi:10.11900/0412.1961.2014.00265

Acta Metall Sin

2015, Vol. 51

Issue (1): 31-39 DOI: 10.11900/0412.1961.2014.00265

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PRECIPITATION BEHAVIOR OF (Nb, Ti)C IN COILING PROCESS AND ITS EFFECT ON MICRO-MECHANICAL CHARACTERISTICS OF FERRITE

XU Yang, SUN Mingxue, ZHOU Yanlei, LIU Zhenyu(

)

State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang 110819

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XU Yang, SUN Mingxue, ZHOU Yanlei, LIU Zhenyu. PRECIPITATION BEHAVIOR OF (Nb, Ti)C IN COILING PROCESS AND ITS EFFECT ON MICRO-MECHANICAL CHARACTERISTICS OF FERRITE. Acta Metall Sin, 2015, 51(1): 31-39.

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Abstract

High strength micro-alloyed steel has been widely used in automobile and machines because of the remarkable high strength and forming property which are attributed to nano-precipitates and refinement of the organization. Since the nano-precipitates are mostly nucleated between austenite/ferrite transition and ferrite can significantly advance strength, it is important to investigate precipitate behavior in coiling process. Nanoindentation technology provides a chance to study the special influence of nano-precipitates on the micro-properties of ferrite. The effect of cooling rate during continuous cooling process and coiling process on microstructural evolution and micro-hardness of Nb-Ti micro-alloyed steel were studied by using the thermal mechanical simulator, micro-hardness instrument, TEM and nanoindentation instrument. The precipitate behaviors of (Nb,Ti)C in coiling process and its effect on nano-hardnesss of ferrite were discussed. Experiments results indicated that the increase of cooling rate in continuous cooling process and coiling process could promote the microstructure transition from ferrite and pearlite to bainite. The micro-hardness of the tested steel increased with the increase of cooling rate in continuous cooling process, and decreased with the cooling rate in coiling process because of the large number of the dispersive nano-precipitate in ferrite which could improve the strength of matrix. The smaller cooling rate could promote volume fraction of (Nb, Ti)C particles in ferrite because there was enough time for the nucleation and growth of (Nb, Ti)C precipitates. When the cooling rate in coiling process was 0.1 ℃/s, precipitates were dispersive in ferrite matrix with a diameter of less than 10 nm. The nanohardness and Young's modulus of ferrite were 4.13 and 249.3 GPa for Nb-Ti micro-alloyed steel, 2.64 and 237.4 GPa for C-Si-Mn steel. The contribution of nano-precipitates to nano-hardness of ferrite reached 1.49 GPa.

Key words: nano-precipitate cooling rate nanoindentation nanohardness Young's modulus

ZTFLH:

TG142

Fund: Supported by Fundamental Research Funds for the Central Universities (Nos.N120807001 and N110607006)

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	Yang XU
	Mingxue SUN
	Yanlei ZHOU
	Zhenyu LIU

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https://www.ams.org.cn/EN/10.11900/0412.1961.2014.00265 OR https://www.ams.org.cn/EN/Y2015/V51/I1/31

Fig.1 Process routings of thermal simulation experiments

Fig.2 OM images of experimental steel in CCT process under cooling rates of 0.5 ℃/s (a), 1 ℃/s (b), 5 ℃/s (c) and 20 ℃/s (d)

Fig.3 CCT curves (a) and variation of micro-hardness with cooling rate (b) of experimental steel (B—bainite, F—ferrite, P—pearlite)

Fig.4 OM images of experimental steel under cooling rates of 0.05 ℃/s (a), 0.1 ℃/s (b), 0.5 ℃/s (c), 1 ℃/s (d), 2 ℃/s (e) and effects of cooling rates on micro-hardness (f)

Fig.5 Precipitation morphologies of experimental steel under cooling rates of 0.1 ℃/s (a), 0.5 ℃/s (b), 1 ℃/s (c) and 2 ℃/s (d)

Fig.6 Morphology after nanoindentation (a), load-depth curves (b) and nanohardness-depth curves (c) of experimental steels under cooling rate 0.1 ℃/s

Fig.7 Schematic of movement of dislocations around nanoindentation tip

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