S. Ya. Betsofen, E. I. Lukin, A. A. Ashmarin, I. O. Bannykh, V. M. Blinov, G. S. Seval’nev, A. A. Aleksandrov, D. V. Chernenok
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引用次数: 0
Abstract—X-ray diffraction analysis is used to investigate the phase composition, texture, and residual macrostresses in Fe–15.9Mn–0.007C and Fe–17.7Mn–0.03C steels in their initial quenched (at 1100°C) state and after subsequent cold rolling to 20–80% reductions. The quenched state of both steels shows the presence of three phases: α', γ, and ε. The ε-phase content decreases from initial values of 65 and 85% to 10–15 and 25–40%, respectively, for Fe–15.9Mn–0.007C and Fe–17.7Mn–0.03C steels after a reduction of 40–60%. The α'-phase content increases to 85–90 and 60–75%, respectively. Lattice strain calculations during the ε → α' and α' → ε phase transformations show preferential transformations during rolling. The texture evolution of the ε phase indicates that the Fe–15.9Mn–0.007C steel undergoes both the ε → α' transformation, causing volume expansion and compressive stresses, and the α' → ε transformation, resulting in volume contraction and tensile stresses. This explains the low level of residual stress in this steel, which varies from –100 to +100 MPa. In contrast, the Fe–17.7Mn–0.03C steel undergoes only the ε → α' transformation during cold rolling at all reductions, generating compressive stresses of 200–400 MPa due to volume expansion.
期刊介绍：
Russian Metallurgy (Metally) publishes results of original experimental and theoretical research in the form of reviews and regular articles devoted to topical problems of metallurgy, physical metallurgy, and treatment of ferrous, nonferrous, rare, and other metals and alloys, intermetallic compounds, and metallic composite materials. The journal focuses on physicochemical properties of metallurgical materials (ores, slags, matters, and melts of metals and alloys); physicochemical processes (thermodynamics and kinetics of pyrometallurgical, hydrometallurgical, electrochemical, and other processes); theoretical metallurgy; metal forming; thermoplastic and thermochemical treatment; computation and experimental determination of phase diagrams and thermokinetic diagrams; mechanisms and kinetics of phase transitions in metallic materials; relations between the chemical composition, phase and structural states of materials and their physicochemical and service properties; interaction between metallic materials and external media; and effects of radiation on these materials.
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