Effects of Trace Ce on Mechanical Properties of a Ferritic/Martensitic Heat Resistant Steel Containing High Cr and Co

doi:10.11901/1005.3093.2021.236

Chinese Journal of Materials Research

2022, Vol. 36

Issue (4): 261-270 DOI: 10.11901/1005.3093.2021.236

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Effects of Trace Ce on Mechanical Properties of a Ferritic/Martensitic Heat Resistant Steel Containing High Cr and Co

WANG Kun¹^,², YANG Renxian¹^,², Cai Xin¹, ZHENG Leigang¹(

), HU Xiaoqiang¹^,²(

), LI Dianzhong¹^,²

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

Cite this article:

WANG Kun, YANG Renxian, Cai Xin, ZHENG Leigang, HU Xiaoqiang, LI Dianzhong. Effects of Trace Ce on Mechanical Properties of a Ferritic/Martensitic Heat Resistant Steel Containing High Cr and Co. Chinese Journal of Materials Research, 2022, 36(4): 261-270.

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Abstract

High Co and Cr containing martensitic heat resisting steels of X20Co without and with trace Ce addition were heat treated under different conditions, then the effect of trace Ce on the microstructure and mechanical properties of the steels were investigated by means of optical microscope, scanning electron microscope, X-ray diffractometer and tensile tester. The results show that in the quenching process, the addition of 50×10^-6 Ce can promote the precipitation of M₆C type carbides along the grain, therewith hinder the grain boundary migration, and make the refinement of austenite grains; As a consequence, the accumulation and growth of M₂₃C₆ type carbides along grain boundaries can be inhibited during tempering process. At the same time, the addition of 50×10^-6 Ce has no significant effect on the hardness, strength and high temperature instantaneous tensile strength, but the toughness and plasticity at room temperature as well as the high temperature plasticity are significantly improved for the high Co and Cr containing martensitic steel X20Co.

Key words: metallic materials rare earth heat resistant steel microstructure toughness and plasticity

Received: 15 April 2021

ZTFLH:

TG142.1

Fund: National Natural Science Foundation of China(51871212);National Key Research and Development Program of China(2020YFB2006800);Youth Innovation Promotion Association of the Chinese Academy of Sciences(2017237);K.C.Wong Education Foundation, Strategic Priority Research Program of the Chinese Academy of Sciences(XDC04000000);Major Scientific and Technological Projects of Jiangxi Province(20194ABC28011)

About author: ZHENG Leigang, Tel: (024)23970106, E-mail: lgzheng@imr.ac.cn
HU Xiaoqiang, Tel: (024)23971127, E-mail: xqhu@imr.ac.cn;

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https://www.cjmr.org/EN/10.11901/1005.3093.2021.236 OR https://www.cjmr.org/EN/Y2022/V36/I4/261

Table 1 Chemical composition of the experimental X20Co and X20CoRE steels (mass fraction, %)

Fig.1 SEM morphology of X20Co (a, c, e) and X20CoRE (b, d, f) heat resistant steels quenched at 1050℃ (a, b), 1130℃ (c,d) and 1200℃ (e, f). (The EDS spectra in Fig.1 a and b showing that the precipitates in the studied steels are rich in W and Mo)

Fig.2 XRD spectra of X20Co (a) and X20CoRE (b) heat resistant steels quenched at different temperatures

Fig.3 Average grain size of X20Co and X20CoRE heat resistant steels quenched at different temperatures

Fig.4 Microstructure of X20Co (a, c, e) and X20CoRE (b, d, f) heat resistant steels quenched at 1130℃ and tempered at 530℃ (a, b), 630℃ (c, d) and 680℃ (e, f)

Table 2 Relative chemical compositions analyzed by SEM-EDS of the typical precipitates and matrix in X20Co and X20CoRE heat resistant steels (mass fraction, %)

Fig.5 XRD spectra of X20Co (a) and X20CoRE (b) heat resistant steels quenched at 1130℃ and tempered at different temperatures

Fig.6 Tensile strength (a), yield strength (b), elongation (c) and impact energy (d) tested at room temperature of the X20Co and X20CoRE steels tempered at different temperatures

Fig.7 Tensile properties at different temperatures of X20Co and X20CoRE heat resistant steels quenched at 1130℃ and tempered at 680℃

Fig.8 Mass fraction of the precipitates as a function of temperature in X20Co heat resistant steel

Fig.9 Tensile fracture morphologies of X20Co (a, c, e) and X20CoRE (b, d, f) heat resistant steels tested at 550℃ (a, b), 650℃ (c, d), and 700℃ (e, f). (The EDS spectra in Fig.1b showing that the inclusions at the fracture dimples in X20CoRE steels are cerium sulfide)

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