| Influence of soaking time in deep cryogenic treatment on the microstructure and mechanical properties of low-alloy medium-carbon HY-TUF steel |
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| 作者姓名： | Ahmad Zare S. R. Hosseini |
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| 作者单位： | Department of Materials Engineering, Maleke-ashtar University of Technology, Isfahan, 83145-115, Iran |
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| 摘 要： | The influence of soaking time in deep cryogenic treatment on the tensile and impact properties of low-alloy medium-carbon HY-TUF steel was investigated in this study. Microstructural studies based on phase distribution mapping by electron backscatter diffraction show that the deep cryogenic process causes a decrease in the content of retained austenite and an increase in the volume fraction of η-carbide with increasing soaking time up to 48 h. The decrease in the content of retained austenite from ~1.23vol% to 0.48vol% suggests an isothermal martensitic transformation at 77 K. The η-type precipitates formed in deep cryogenic-treated martensite over 48 h have the Hirotsu and Nagakura orientation relation with the martensitic matrix. Furthermore, a high coherency between η-carbide and the martensitic matrix is observed by high-resolution transmission electron microscopy. The variations in macrohardness, yield strength, ultimate tensile strength, and ductility with soaking time in the deep cryogenic process show a peak/plateau trend.
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| 关 键 词： | low alloy steel medium carbon steel cryogenic treatment microstructure mechanical properties fractography |
Influence of soaking time in deep cryogenic treatment on the microstructure and mechanical properties of low-alloy medium-carbon HY-TUF steel |
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| Ahmad Zare,S. R. Hosseini.Influence of soaking time in deep cryogenic treatment on the microstructure and mechanical properties of low-alloy medium-carbon HY-TUF steel[J].International Journal of Minerals,Metallurgy and Materials,2016,23(6):658-666. |
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| Authors: | Ahmad Zare S R Hosseini |
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| Institution: | Department of Materials Engineering, Maleke-ashtar University of Technology, Isfahan 83145-115, Iran |
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| Abstract: | The influence of soaking time in deep cryogenic treatment on the tensile and impact properties of low-alloy medium-carbon HY-TUF steel was investigated in this study. Microstructural studies based on phase distribution mapping by electron backscatter diffraction show that the deep cryogenic process causes a decrease in the content of retained austenite and an increase in the volume fraction ofη-carbide with increasing soaking time up to 48 h. The decrease in the content of retained austenite from ~1.23vol% to 0.48vol% suggests an isothermal martensitic transformation at 77 K. Theη-type precipitates formed in deep cryogenic-treated martensite over 48 h have the Hi-rotsu and Nagakura orientation relation with the martensitic matrix. Furthermore, a high coherency betweenη-carbide and the martensitic matrix is observed by high-resolution transmission electron microscopy. The variations in macrohardness, yield strength, ultimate tensile strength, and ductility with soaking time in the deep cryogenic process show a peak/plateau trend. |
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| Keywords: | low alloy steel medium carbon steel cryogenic treatment microstructure mechanical properties fractography |
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