Effect of Retained Austenite on Toughness and Plasticity of 0.23C-1.9Mn-1.6Si Steel

doi:10.11901/1005.3093.2013.623

Chinese Journal of Materials Research

2014, Vol. 28

Issue (4): 274-280 DOI: 10.11901/1005.3093.2013.623

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Effect of Retained Austenite on Toughness and Plasticity of 0.23C-1.9Mn-1.6Si Steel

Yongqiang REN,Chengjia SHANG(

),Hongwei ZHANG,Shengfu YUAN,Erhu CHEN

School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083

Cite this article:

Yongqiang REN,Chengjia SHANG,Hongwei ZHANG,Shengfu YUAN,Erhu CHEN. Effect of Retained Austenite on Toughness and Plasticity of 0.23C-1.9Mn-1.6Si Steel. Chinese Journal of Materials Research, 2014, 28(4): 274-280.

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Abstract

The 6.5 mm thick plate of a multiphase steel (0.23C-1.9Mn-1.6Si%) composed of intercritical ferrite, martensite and well-distributed retained austenite was obtained by an optimized IQ&P process. Tensile strength of this kind of multiphase steel is higher than 1000MPa. Microstructure of the steel was characterized by means of SEM and XRD, and its mechanical properties were measured by the tensile and instrumented Charpy impact testing at room temperature. In comparison with the IQ&T steel and Q&T steel, which have the same tensile strength, the IQ&P steel shows much better comprehensive mechanical properties with higher toughness, better elongation and bigger products of tensile strength and total elongation. The reason for this is mainly the multi-phase microstructure of the IQ&P steel. TRIP effect of the retained austenite which occurs during the deformation process can significantly improve the toughness and plasticity of the IQ&P steel, and thus contributed to the improvement of mechanical properties.

Key words: metallic materials multiphase microstructure retained austenite impact toughness uniform elongation products of tensile strength and total elongation

Received: 29 August 2013

Fund: *Supported by the National Basic Research Program of China No. 2010CB630801.

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	Yongqiang REN
	Chengjia SHANG
	Hongwei ZHANG
	Shengfu YUAN
	Erhu CHEN

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https://www.cjmr.org/EN/10.11901/1005.3093.2013.623 OR https://www.cjmr.org/EN/Y2014/V28/I4/274

Fig.1 Equilibrium phase fractions for the 0.23C-1.9Mn-1.6Si steel as a function of temperature as calculated using Thermo-Calc

Fig.2 Microstructures of the 0.23C-1.95Mn-1.62Si steel obtained by the treatment of direct quenching after 900℃ austenitizing for 30min

Table 1 Heat treatment parameters (temperature (T) and time (t)) of different treatments

Table 2 Instrumented Charpy impact values of the IQ&P, IQ&T, and Q&T steel

Fig.3 SEM images of samples after (a) IQ&P, (b) IQ&T, and Q&T treatments (RA/UM is retained austenite or untempered martensite, B is bainite, IF is intercritical ferrite, TM is tempered martensite)

Fig.4 Curves of load and absorb energy K_V2 vs hammer diaplacement obtained in the instrumented Impact teasts energy for the samples after (a) IQ&P, (b) IQ&T, and Q&T treatments (E₁—crack forming energy, E₂—crack propagation energy, E₃—energy absorbed during brittle fracture, P_m—maximum impact load, P_f—brittle fracture start load, P_a—brittle fracture arrested load, d_m, d_f and d_a are the harmmer displacement of the charpy impact fracture course at impact load of P_m, P_f, and P_a, respectively)

Table 3 Tensile properties of samples after IQ&P, IQ&T and Q&T treatment

Fig.5 Plot of instantaneous strain hardening as a founction of true strain for the IQ&P, IQ&T and Q&T steel

Fig.6 XRD patterns of the IQ&P steel under different (a) impact and (b) tensile deformations

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