Effect of Austenitizing Temperature on Microstructure and Properties of High Carbon Cu-bearing Martensitic Stainless Steel

doi:10.11901/1005.3093.2023.186

Chinese Journal of Materials Research

2024, Vol. 38

Issue (2): 121-129 DOI: 10.11901/1005.3093.2023.186

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Effect of Austenitizing Temperature on Microstructure and Properties of High Carbon Cu-bearing Martensitic Stainless Steel

HAO Wenjun¹, JING Hemin¹(

), XI Tong²(

), YANG Chunguang², YANG Ke²

^1.School of Materials Science and Engineering. Anhui University of Technology, Ma Anshan 243000, China
^2.Shi -changxu Innovation Center for Advanced Materials, Institute of Metal Research. Chinese Academy of Sciences, Shenyang 110016, China

Cite this article:

HAO Wenjun, JING Hemin, XI Tong, YANG Chunguang, YANG Ke. Effect of Austenitizing Temperature on Microstructure and Properties of High Carbon Cu-bearing Martensitic Stainless Steel. Chinese Journal of Materials Research, 2024, 38(2): 121-129.

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Abstract

The effect of copper (Cu) addition on the microstructure, mechanical properties and corrosion resistance of high carbon Cu-bearing martensitic stainless steels, being subjected to austenitizing treatment at different temperatures was investigated by means of optical microscopy (OM), scanning electron microscope, (SEM), X-Ray diffraction (XRD), electron back scattered diffraction (EBSD) and transmission electron microscope (TEM). The results show that the fraction of carbides decreases and the content of retained austenite increases gradually with the increase of austenitizing temperature. The addition of Cu has a positive effect on the amount of precipitation for small size carbides, which distributed in the matrix, and increases the retained austenite significantly. The hardness of high carbon Cu-bearing martensitic stainless steel decreases slightly after Cu addition, because the softening effect of retained austenite is greater than the strengthening effect of martensite. Meanwhile, the impact absorption energy increase from 1.5 J to 9.1 J, indicating that the toughness of the steel was enhanced significantly. Besides, the free-corrosion potential of the Cu-bearing stainless steels decreases due to the increase of retained austenite volume fraction.

Key words: metallic materials martensitic stainless steel austenitizing temperature hardness corrosion resistance retained austenite

Received: 20 March 2023

ZTFLH:

TG161

Fund: National Natural Science Foundation(52101293)

Corresponding Authors: XI Tong, Tel: (024)23971899, E-mail: txi@imr.ac.cn;
JING Hemin, Tel: (0555)2311570, E-mail: jinghemin@.ahut.edu.cn

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	YANG Chunguang
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https://www.cjmr.org/EN/10.11901/1005.3093.2023.186 OR https://www.cjmr.org/EN/Y2024/V38/I2/121

Table 1 Chemical compositions of the experimental steels (mass fraction, %)

Fig.1 Optical morphologies of 8Cr18MoV (a~d) and 8Cr18MoV-3.1Cu (e~h) with different austenite temperatures (a, e) 975^oC, (b, f) 1025^oC, (c, g) 1075^oC, (d, h) 1125^oC

Fig.2 SEM morphologies of 8Cr18MoV (a~d), 8Cr18MoV-2.0Cu (e~h) and 8Cr18MoV-3.1Cu (i~l) with different austenite temperatures (a, e, i) 975^oC, (b, f, j) 1025^oC, (c, g, k) 1075^oC, (d, h, l) 1125^oC

Fig.3 Change trends of carbides content (a), nano-sized carbides with different austenite temperature (b) and type of carbides austenized at 1075^oC for 8Cr18MoV and 8Cr18MoV-3.1Cu (c)

Fig.4 Microstructure of carbide in 8Cr18MoV-2.0Cu with 1075^oC austenite temperature observed by TEM

Fig.5 XRD spectra of 8Cr18MoV (a), 8Cr18MoV-2.0Cu (b), 8Cr18MoV-3.1Cu (c) and the change trends of retained austenite content with different temperatures (d)

Fig.6 IPF and phase content for experimental steels with austenite temperature at 1075^oC (a, d) 8Cr18MoV, (b, e) 8Cr18MoV-2.0Cu, (c, f) 8Cr18MoV-3.1Cu

Fig.7 Variation of hardness (a) and impact energy (b) for experimental steels with different temperatures

Fig.8 Fracture morphologies of experimental steels (a, b) 8Ce18MoV, (c, d) 8Ce18MoV-2.0Cu, (e, f) 8Cr18MoV-3.1Cu

Fig.9 Potentiodynamic polarization curves (a) of 8Cr18MoV with different austenitizing temperatures and 8Cr18MoV-2.0Cu、8Cr18MoV-3.1Cu with 1075^oC austenitizing temperatures and variation of E_pit and E_corr (b)

Table 2 Electrochemical parameters of experimental steels

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