MICROSTRUCTURE, MECHANICAL PROPERTIES AND WORK HARDENING BEHAVIOR OF 1300 MPa GRADE 0.14C-2.72Mn-1.3Si STEEL

doi:10.11900/0412.1961.2014.00113

Acta Metall Sin

2014, Vol. 50

Issue (10): 1153-1162 DOI: 10.11900/0412.1961.2014.00113

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MICROSTRUCTURE, MECHANICAL PROPERTIES AND WORK HARDENING BEHAVIOR OF 1300 MPa GRADE 0.14C-2.72Mn-1.3Si STEEL

ZHAO Zhengzhi^1,², TONG Tingting^1,², ZHAO Aimin^1,², HE Qing^1,², DONG Rui^1,², ZHAO Fuqing^1,²

1 Engineering Research Institute, University of Science and Technology Beijing, Beijing 100083
2 Beijing Laboratory of Modern Traffic Metal Materials and Processing Technology, University of Science and Technology Beijing, Beijing 100083

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ZHAO Zhengzhi, TONG Tingting, ZHAO Aimin, HE Qing, DONG Rui, ZHAO Fuqing. MICROSTRUCTURE, MECHANICAL PROPERTIES AND WORK HARDENING BEHAVIOR OF 1300 MPa GRADE 0.14C-2.72Mn-1.3Si STEEL. Acta Metall Sin, 2014, 50(10): 1153-1162.

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Abstract

Multiphase microstructure which contains ferrite, lath martensite, tempered martensite and a specific proportion of retained austenite with chemical composition of Mn between low Mn and medium Mn (0.14C-2.72Mn-1.3Si, mass fraction, %) belong to C-Si-Mn series was produced using continuous annealing simulator. By means of dilatometric simulation, SEM, TEM, EBSD and XRD, microstructures of the steels in different heat treatments were characterized. The results illustrate that the tested steel sheet gained good comprehensive properties with yield strength of 672 MPa, tensile strength up to 1333 MPa, total elongation A₅₀ of 13% after annealing at 800 ℃, which can be explained by the refined microstructure, appropriate proportion of phases and a specific proportion of retained austenite. This work has deeply analyzed the work hardening behavior, discussed the change of instantaneous work hardening rate n. The multi-stage work hardening behavior was studied by modified C-J analysis, and explored the influence of ( is the volume fraction of martensite, is the equivalent diameter of martensite) and fraction of ferrite on it. The results show that n increases with the rise of true strain and then decreases, but has a different feature in the decrease for the different tested steels; the multi-stage work hardening behavior studied by modified C-J analysis shows 2 or 3 stages because of the different martensite volume fraction. The strain scope of combined action of ferrite and martensite △e is affected by the volume fraction of ferrite: △e is small when the temperature is low, and then △e is large when temperature increases, while the △e maybe small when temperature continue to rise. Above all, the high instantaneous work hardening rate which is helpful for the improvement of strength, plasticity and toughness can be attributed to the proportion, morphology and distribution of ferrite and martensite, which is also the consequence of coordination and combination action of each factor.

Key words: multiphase microstructure retained austenite work hardening behavior uniform elongation modified C-J analysis

ZTFLH:

TG113

Fund: Supported by National Natural Science Foundation of China (No.51271035) and Fundamental Research Funds for the Central Universities (No.FRF-TP-10-001A)

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	Zhengzhi ZHAO
	Tingting TONG
	Aimin ZHAO
	Qing HE
	Rui DONG
	Fuqing ZHAO

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https://www.ams.org.cn/EN/10.11900/0412.1961.2014.00113 OR https://www.ams.org.cn/EN/Y2014/V50/I10/1153

Fig.1 Schematic of annealing process applied to 0.14C-2.72Mn-1.3Si steel

Fig.2 SEM images of tested steel under annealing temperatures of 760 ℃ (a), 780 ℃ (b), 800 ℃ (c) and 820 ℃ (d)

Table 1 Volume fraction of each constituent phase and mass fraction of carbon in retained austenite of tested steel under different annealing temperatures

Fig.3 TEM images of tested steel under annealing temperatures of 760 ℃ (a) and 800 ℃ (b)

Fig.4 Mechanical properties of tested steel under different annealing temperatures

Fig.5 Stress-strain curves of tested steel under different annealing temperatures

Fig.6 XRD spectra of tested steel under different annealing temperatures

Fig.7 Volume fraction of retained austenite and mass fraction of carbon in retained austenite in tested steel under different annealing temperatures

Fig.8 TEM images of retained austenite in tested steel after annealing at 800 ℃

Fig.9 Instantaneous work hardening rate n of tested steel under different annealing temperatures

Fig.10 Plots of the work hardening behavior of the tested steel obtained by using the modified C-J analysis (m_I, m_II and m_III indicate the stress exporents of stages I, II and III, respectively)

Fig.11 EBSD images of quality maps (a, c) and inverse pole figure (IPF) maps (b, d) for tested steel annealed at 760 ℃ (a, b) and 800 ℃ (c, d)

Table 2 Stress exponents and strain at the transition points in deformation stages of tested steels by the modified C-J analysis

T / ℃	d_F μm	d_M μm	$f M / d M$ (%·μm^-1)^1/2	n_min	n_max	n_max-n_min
760	4.6	0.23	11.07	0.38	0.58	0.20
780	3.7	0.51	9.34	0.46	0.62	0.16
800	2.2	0.82	9.11	0.47	0.63	0.16
820	1.3	1.42	7.04	0.54	0.64	0.10

Table 3 Equivalent grain size of tested steel after annealing and the extreme values of n

Fig.12 Effects of ferrite volume fraction on strain scope of combined action of ferrite and martensite △e in tested steel (Dotted line indicates the tendency of △e when continue to lower the volume fraction of ferrite)

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