Microstructure and Mechanical Properties of Nonequilibrium Austenite in Fe-C-(Mo, W) Systems Rapidly Quenched from Melts
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By melt-quenching technique, nonequilibrium austenitic alloys possessing high strength and hardness combined with good ductility have been found in Fe-C-Mo and Fe-C-W ternary systems. This formation region is limited to about 1.0 to 2.4wt% C and 3 to 22wt% Mo for Fe-C-Mo system and 1.0 to 2.4wt% C and 3 to 24wt% W for Fe-C-W system. The austenite phase has ultra-fine grains of about 0.2μm in diameter. Their Vickers hardness and tensile strength increase with increase in the amounts of carbon and molybdenum or tungsten, and the maximum values attain about 710 DPN and 1 450MPa for Fe-C-Mo system and about 700 DPN and 1 500MPa for Fe-C-W system, respectively. Elongation increases with decreasing carbon and molybdenum or tungsten contents and reaches about 2% for Fe-1.4%C-9%Mo and Fe-1.4%C-15%W. The relatively large elongation at low concentrations of carbon and molybdenum or tungsten results from the transformation-induced plasticity of austenite to martensite. In addition, the changes in microstructure and mechanical properties of the tempered austenitic alloys have been investigated and it has been observed that a large secondary hardening occurs in a wide range of about 600 to 900K for Fe-C-Mo alloys and 500 to 900K for Fe-C-W alloys. The hardening is due to bainitic transformation from austenite to ferrite and M3C in the temperature range from 500 to 700K and due to phase transformation from austenite to martensite and carbide in the range from 700 to 900K. Thus the present alloys may be attractive as fine gauge high-strength materials.
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The Iron and Steel Institute of Japan | 論文
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