Effect of Heat Treatment Process on Mechanical Properties of a Medium Carbon Low Alloy Steel

doi:10.11901/1005.3093.2014.752

Chinese Journal of Materials Research

2015, Vol. 29

Issue (6): 422-428 DOI: 10.11901/1005.3093.2014.752

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Effect of Heat Treatment Process on Mechanical Properties of a Medium Carbon Low Alloy Steel

Wei PAN,Zulai LI(

),Quan SHAN,Yehua JIANG,Zhiyang FENG,Rong ZHOU

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

Cite this article:

Wei PAN,Zulai LI,Quan SHAN,Yehua JIANG,Zhiyang FENG,Rong ZHOU. Effect of Heat Treatment Process on Mechanical Properties of a Medium Carbon Low Alloy Steel. Chinese Journal of Materials Research, 2015, 29(6): 422-428.

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Abstract

Effect of heat treatment processes on the microstructure and mechanical properties of a medium carbon low alloy steel was studied by means of color metallography, XRD and mechanical tests. The adopted heat treatment processes included air quenching and then austempering in salt bath, water-cooling and then austempering in salt bath, as well as directly austempering in salt bath. The results show that after treatments according to the above three processes the steel may exhibited microstructure composed of different amount of bainite and martensite, and better mechanical properties in comparison with the cast ones, i.e. its impact toughness and hardness were increased by 92%-183% and 31%-55% respectively. For the case of air cooling and then austempering in salt bath, the amount of bainite decreased gradually with the increase of air cooling time while the amount of martensite progressively increased, correspondingly its hardness and impact toughness showed a tendency of increase and decrease respectively. The mechanical performance of the medium carbon low alloy steel is closely related to the ratio of bainite to martinsite in the microstructure. It is noted that the steel with a duplex microstructure of 50%-60% bainite and 30%-40% martensite exhibited an optimal comprehensive mechanical performance.

Key words: metallic materials bainite / martensite mixed microstructure austempering color metallography ductile fracture

Received: 17 December 2014

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	Wei PAN
	Zulai LI
	Quan SHAN
	Yehua JIANG
	Zhiyang FENG
	Rong ZHOU

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https://www.cjmr.org/EN/10.11901/1005.3093.2014.752 OR https://www.cjmr.org/EN/Y2015/V29/I6/422

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

Fig.1 XRD patterns of samples of the different heat treatment process

Fig.2 Microstructure of low alloy medium carbon steel at cast (a), water-cooling 2-4 s and austempering in austempering in salt bath, eroded by 4% nitric acid alcohol solution (b)

Fig.3 Colored metallography of different heat treatment process (a) water-cooling 2-4 s and austempering in austempering in salt bath, (b) austempering in austempering in salt bath, (c) air-cooling 2-4 s and austempering in austempering in salt bath, (d) air-cooling 6-8 s and austempering in austempering in salt bath, (e) air-cooling 10-12 s and austempering in austempering in salt bath

Table 2 Content of microstructure after different heat treatment process

Fig.4 Effects curve of air-cooling time on the content of microstructure after air-cooling and austempering in salt bath heat treatment process

Table 3 Comparing before and after heat treatment process of the sample hardness and impact toughness

Fig.5 Effects of air-cooling time on mechanical properties in air-cooling and austempering in salt bath heat treatment process

Fig.6 Fracture morphology of impact samples at casting (a), air-cooling 2-4 s and austempering in salt bath (b)

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