Effect of Quenching Process on Microstructure of a HSLA Steel

doi:10.11901/1005.3093.2016.648

Chinese Journal of Materials Research

2017, Vol. 31

Issue (9): 650-658 DOI: 10.11901/1005.3093.2016.648

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Effect of Quenching Process on Microstructure of a HSLA Steel

Ting YANG, Hang SU(

), Xiaobing LUO, Feng CHAI, Zhengyan ZHANG

Department of Structural Steels, Central Iron and Steel Research Institute, Beijing 100081, China

Cite this article:

Ting YANG, Hang SU, Xiaobing LUO, Feng CHAI, Zhengyan ZHANG. Effect of Quenching Process on Microstructure of a HSLA Steel. Chinese Journal of Materials Research, 2017, 31(9): 650-658.

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Abstract

The effect of quenching cooling rates on microstructure of a high -strength low-alloy (HSLA) steel plate of 35 mm in thickness was investigated by the finite element software ABAQUS, Formastor thermal dilatometer, metalloscope, TEM and EBSD. The results show that the quenching cooling rate has significant effect on the microstructure and mechanical properties within the near surface band from the surface to the depth 8 mm of the steel plate. With the increase of quenching cooling rate, the amount of lath-like microstructure, the density of dislocation and low misorientation angle boundary have significant increased, and the width of lathes is markedly refined, leading to the obviously increase of the hardness of the band near the surface. With the increase of quenching cooling rate, there were no significant difference on the hardness, the size of lathes, grain boundary characters and MA constituent of the band from the quarter depth to the center of the steel plates. The ABAQUS simulation result is in accordance with the distribution of the hardness and microstructure of steel plates. The distribution of the cooling rate on the cross-section of steel plates determine the microstructure transition types and features.

Key words: metallic materials HSLA steel quenching cooling rate microstructure

Received: 07 November 2016

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	Ting YANG
	Hang SU
	Xiaobing LUO
	Feng CHAI
	Zhengyan ZHANG

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https://www.cjmr.org/EN/10.11901/1005.3093.2016.648 OR https://www.cjmr.org/EN/Y2017/V31/I9/650

Table 1 Chemical composition of the test HSLA steel(mass fraction, %)

Table 2 Thermal physical parameters in simulation of quenching

Fig.1 CCT curve of the tested steel

Fig.2 Microstructure of the CCT tested samples at different cooling rates (a) 0.1℃/s; (b) 0.8℃/s; (c) 16.2℃/s; (d) 40.5℃/s

Fig.3 Average cooling rate of 35 mm thick steel plates between 400℃~600℃ at different sections

Fig.4 Vickers hardness of steel plates in cross-section under different cooling conditions

Fig.5 Microstructure of steel plates at different sections under different cooling conditions (a, b, c) correspond to the surface、1/4 and the core of steel plate cooling by oil; (d, e, f) correspond to the surface、1/4 and the core of steel plate cooling by water; (g, h, i) correspond to the surface、1/4 and the core of steel plate cooling by ice salt water

Fig.6 TEM images at the surface and the core of steel plates under different cooling condition (a, b, c) correspond to the surface of steel plate cooling by oil, water, ice salt water respectively; (d, e, f) correspond to the core of steel plate cooling by oil, water, ice salt water respectively

Fig.7 Average width of lath at the surface and the core of steel plates under different cooling conditions

Fig.8 Boundary map of the surface and the core of steel plates under different cooling conditions (a, b, c) correspond to the surface of steel plate cooling by oil, water, ice salt water respectively; (d, e, f) correspond to the core of steel plate cooling by oil, water, ice salt water respectively; (The low contrast and high-contrast lines indicate the boundaries with misorientations of 2°~15°and higher than 15°, respectively)

Fig.9 Effective grain size of the surface and the core of steel plates under different cooling conditions

Fig.10 Colored corrosion map of steel plates at different sections under different cooling conditions (a, b, c) correspond to the surface、1/4 and the core of steel plate cooling by oil; (d, e, f) correspond to the surface、1/4 and the core of steel plate cooling by water; (g, h, i) correspond to the surface、1/4 and the core of steel plate cooling by ice salt water

Fig.11 Volume percent of MA constituent at different sections of steel plates under different cooling conditions

Fig.12 Size distribution of MA constituent at different sections of steel plates under different cooling conditions

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