Effect of Double Quenching on Microstructure and Impact Toughness of a High Strength Low Alloy Steel

doi:10.11901/1005.3093.2019.580

Chinese Journal of Materials Research

2020, Vol. 34

Issue (9): 705-711 DOI: 10.11901/1005.3093.2019.580

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Effect of Double Quenching on Microstructure and Impact Toughness of a High Strength Low Alloy Steel

CHEN Gang¹^,², LUO Xiaobing¹(

), CHAI Feng¹, YANG Caifu¹, ZHANG Zhengyan¹, YANG Zhigang²

1. Department of Structure Steels, Central Iron and Steel Research Institute, Beijing 100081, China
2. Department of Materials Science and Engineering, Tsinghua University, Beijing 100084, China

Cite this article:

CHEN Gang, LUO Xiaobing, CHAI Feng, YANG Caifu, ZHANG Zhengyan, YANG Zhigang. Effect of Double Quenching on Microstructure and Impact Toughness of a High Strength Low Alloy Steel. Chinese Journal of Materials Research, 2020, 34(9): 705-711.

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Abstract

The effect of double quenching and tempering (DQT) treatment as well as the conventional quenching and tempering (CQT) treatment on the microstructure and impact toughness of a high strength low alloy steel were investigated. The results show that compared with the CQT treatment, the impact toughness improved a lot, while the yield strength just slightly decreased for the DQT treated steel. These changes were characterized by optical microscope (OM), scanning electron microscope (SEM), electron back scatter diffraction (EBSD) and transmission electron microscope (TEM). It follows that in comparison to the CQT treatment, the DQT treatment led to a finer microstructure, namely, the size of prior austenite grain and the effective grain were refined, and the density of the high angle misorientation was increased, while the frequency of deflection for the crack propagation for the DQT treated steel was much higher than the CQT treated one. The superior toughness of the DQT treated steel can be attributed to the finer microstructure.

Key words: metallic materials HSLA double quenching toughness high-angle boundary crack propagation

Received: 12 December 2019

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	Gang CHEN
	Xiaobing LUO
	Feng CHAI
	Caifu YANG
	Zhengyan ZHANG
	Zhigang YANG

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https://www.cjmr.org/EN/10.11901/1005.3093.2019.580 OR https://www.cjmr.org/EN/Y2020/V34/I9/705

Fig.1 Diagram of traditional heat treatment process and double quenching heat treatment process

Table 1 The mechanical properties of the investigated steel by different heat treatments

Fig.2 Impact energy and percentage of ductile fracture surface-temperature curves for the specimens treated by DQT and CQT

Fig.3 SEM micrographs showing the tempering microstructure: (a) DQT and (b) CQT

Fig.4 Prior austenite grain size after different heat treatment: (a) DQT and (b) CQT

Fig.5 EBSD grain boundary distribution maps of specimens treated by (a) DQT and (b) CQT (Where black and red lines represent the high misorientation angle boundaries (≥15°) and low misorientation angle boundaries (2°~15°), respectively) and (c) the total grain boundary density of specimens treated by DQT and CQT ranged 0°~60°

Fig.6 TEM images of nanometer copper precipitates (a)、(b) CQT; (c)、(d) DQT

Fig.7 SEM fractographs of the Charpy impact specimens in (a) DQT and (b) CQT conditions

Fig.8 SEM images of the main crack propagation of specimens in (a) DQT and (b) CQT conditions

Fig.9 SEM images of (a) secondary crack propagation and (b) main crack propagation for impact specimens treated by DQT process

Fig.10 EBSD image showing cleavage crack propaga- tion of the impact specimen treated by DQT process (black lines denote high angle grain boundaries)

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