Investigation on High Temperature Deformation Behavior and Microstructure Evolution of Si-Mn-Cr-B Alloy Steel

doi:10.11901/1005.3093.2015.714

Chinese Journal of Materials Research

2016, Vol. 30

Issue (8): 595-602 DOI: 10.11901/1005.3093.2015.714

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Investigation on High Temperature Deformation Behavior and Microstructure Evolution of Si-Mn-Cr-B Alloy Steel

BI Jinfeng, LI Zulai^**, SHAN Quan, JIANG Yehua, WEI He, JIAO Yan

School of Materials Science and Engnineering, Kunming University of Scinece and Technology, Kunming 650093, China

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BI Jinfeng, LI Zulai, SHAN Quan, JIANG Yehua, WEI He, JIAO Yan. Investigation on High Temperature Deformation Behavior and Microstructure Evolution of Si-Mn-Cr-B Alloy Steel. Chinese Journal of Materials Research, 2016, 30(8): 595-602.

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Abstract

The high-temperature single-pass compression test was carried out by utilizing Gleeble-1500D thermal simulation compression testing machine for Si-Mn-Cr-B alloy steel, while its thermal deformation behavior was studied by different strain rate (0.01-5 s^-1) in temperature range 950-1200℃ for the same deformation degree i.e. 50%. The influence of strain rate and temperature on the stress - strain curve and microstructure evolution was explored, and the thermal deformation constitutive equation of Si-Mn-Cr-B alloy steel was established on the basis of Arrhenius hyperbolic sine function. The results show that: the peak stress of the high temperature deformation of the Si-Mn-Cr-B alloy steel increases with the increase of strain rate and the decrease of deformation temperature, but high temperature deformation is controlled by thermal activation energy and its thermal activation energy is Q=372.6 kJ/mol; dynamic recrystallization occurs during deformation, and the average size of the dynamically recrystallized grains all shows a trend of increase with the increase of temperature and the decrease of strain rate.

Key words: metallic materials Si-Mn-Cr-B alloy steel thermal deformation microstructure materials evolution dynamicrecry stallization constitutive equations

Received: 08 December 2015

Fund: *Supported by Yunnan Provincal Science and Technology Department No619320130010

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	Jinfeng BI
	Zulai LI
	Quan SHAN
	Yehua JIANG
	He WEI
	Yan JIAO

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https://www.cjmr.org/EN/10.11901/1005.3093.2015.714 OR https://www.cjmr.org/EN/Y2016/V30/I8/595

Table 1 Chemical composition of low alloy medium carbon steel (%, mass fraction)

Fig.1 The true stress-true strain curve of Si-Mn-Cr-B alloy steel under different strain rate and temperature (a) 0.01 s^-1; (b) 0.1 s^-1; (c) 0.5 s^-1; (d) 1 s^-1; (e) 5 s^-1

Fig.2 The relation curve of peak stress and strain rate

Fig.3 The

ln [sinh (ασ)] - 1 / T

relation curve of silico-mangan steel under different strain rate

Fig.4 The comparison between theoretical calculation flow stress and measured peak value

Fig.5 The microscopic structure of silico-mangan steel at different temperature when ε=5 s^-1. (a) 950℃; (b) 1000℃; (c) 1050℃; (d) 1100℃; (e) 1150℃; (f) 1200℃

Fig.6 The microscopic structure of silico-mangan steel in different strain rate at 1100℃ (a) 0.1 s^-1; (b) 0.5 s^-1; (c) 1 s^-1; (d) 5 s^-1

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