Microstructure and Mechanical Properties of an Austempered Nanostructured Bainitic Steel

doi:10.11901/1005.3093.2023.370

Chinese Journal of Materials Research

2024, Vol. 38

Issue (4): 279-287 DOI: 10.11901/1005.3093.2023.370

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Microstructure and Mechanical Properties of an Austempered Nanostructured Bainitic Steel

WANG Yuzhao¹, JIANG Zhonghua²(

), JIA Chunni², ZHANG Yutuo¹^,²(

), WANG Pei²

^1.School of Materials Science and Engineering, Shenyang Ligong University, Shenyang 110159, China
^2.Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China

Cite this article:

WANG Yuzhao, JIANG Zhonghua, JIA Chunni, ZHANG Yutuo, WANG Pei. Microstructure and Mechanical Properties of an Austempered Nanostructured Bainitic Steel. Chinese Journal of Materials Research, 2024, 38(4): 279-287.

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Abstract

Based on Thermo-Calc calculation, a nanostructured bainite steel, which is suitable for making steel wire, with composition of Fe-0.8C-2Mn-1.5Si-1.5Cr-0.25Mo-0.25Ni-1Al-0.25Co-0.1V was designed. The influence of austempering treatment on microstructure and mechanical properties of the steel was investigated by means of scanning electron microscope (SEM), X-ray diffractometer (XRD), transmission electron microscope (TEM), thermal dilatometer, and tensile tester in terms of microstructures, thermal and mechanical properties etc. Results show that after austempering at lower temperature, the microstructure of the nanostructured bainitic steel is composed of nanostructured bainite ferrite lath, retained austenite and a little proportion of martensite. With the increase of austempering temperature, the transformation rate and the volume fraction of bainite ferrite increase. As the austempering time increases, the volume fraction of bainite ferrite increases, while the amount of undercooled austenite decreases, and the size and volume fraction of the massive M/A islands obtained at room temperature decrease. Due to the carbon partitioning sufficiently between the bainite ferrite and austenite, the stability of undercooled austenite is improved, and the proportion of brittle martensite in M/A islands is reduced significantly. This induces the transition of tensile fracture from mixed fracture to quasi-cleavage fracture. After being heated at 230^oC for 48 hours, the tensile strength and yield strength of the experimental steel were 1625 and 1505 MPa, respectively, with an elongation of 34.5%, indicating the best match for strength and toughness.

Key words: metallic materials austempering microstructure mechanical properties nanostructured bainite ferrite retained austenite

Received: 25 July 2023

ZTFLH:

TG142.1

Fund: Liaoning Postdoctoral Innovation Foundation(2020-BS-010)

Corresponding Authors: JIANG Zhonghua, Tel: 18204080610, E-mail: zhjiang12s@imr.ac.cn;

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	WANG Yuzhao
	JIANG Zhonghua
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	ZHANG Yutuo
	WANG Pei

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https://www.cjmr.org/EN/10.11901/1005.3093.2023.370 OR https://www.cjmr.org/EN/Y2024/V38/I4/279

Table 1 Chemical composition of experimental steel (mass fraction, %)

Fig.1 Dilation-temperature curve of experimental steel

Fig.2 Illustration of austempering treatment

Fig.3 Illustration of tensile sample

Fig.4 Bainite transformation curves of experimental steel under different austempering treatments (a) Dilation-time curve and (b) Bainite transformation rate-time curve

Fig.5 SEM analysis of the experimental steel under different austempering processes (a) 230-8 h, (b) 230-16 h, (c) 230-48 h (d), 270-8 h, (e) 270-16 h, (f) 270-48 h

Fig.6 TEM bright field image of typical microstructure of experimental steel austempered at 270^oC (a) low-magnification TEM image, (b) high-magnification TEM image

Fig.7 EBSD diagram of local microstructure of experimental steel after isothermal treatment at different quenching temperatures for 48 h (a) IPF diagram of 230-48 h sample, (b) BC diagram of 230-48 h sample, (c) IPF diagram of 270-48 h sample, (d) BC diagram of 270-48 h sample

Fig.8 XRD patterns of experimental steel after different austempering treatments

Table 2 Volume fraction of retained austenite, carbon content in retained austenite and the volume fraction of M/A island in the samples with different austempering treatments

Fig.9 True stress-strain curves of experimental steel after different austempering treatments

Table 3 Tensile properties of experimental steel after different austempering treatments

Fig.10 SEM analysis of experimental steel under different austempering treatment (a, d) 230-8 h, (b, e) 230-16 h, (c, f) 230-48 h, (g, j) 270-8 h (h, k) 270-16 h, (i, l) 270-48 h

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