P. D. Dolzhenko, M. V. Odnobokova, M. G. Mikhailov, M. S. Tikhonova, A. N. Belyakov, R. O. Kaibyshev
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引用次数: 0
Abstract
The microstructure and microhardness of 316L-type austenitic stainless steel obtained by selective laser melting and then annealed at 900–1200°C have been studied. This paper is aimed at clarifying the features of the recovery process in the steel. The experimental samples were developed by selective laser melting using a ProX200 3D system in a nitrogen atmosphere without platform preheating. The laser power of 240 W, the beam speed of 1070 mm/s, the distance between tracks of 80 μm, and the layer thickness of 30 μm were applied. Annealing was carried out at temperatures of 900–1200°C for 1 h and at temperatures of 1000 and 1100°C for 1 to 10 h. It was found that the recovery processes at temperatures of 900–1100°C developed with a very sluggish kinetics. After 1 h annealing at 900–1100°C, the steel microstructure steel was characterized by a grain size of 25 ± 1 µm, and a dislocation density of 8.7 × 1013 m–2. An increase in the annealing duration to 10 h did not lead to significant changes in the microstructure of the steel samples annealed at 1000°C, whereas the samples annealed at 1100°C experienced the developmen of primary recrystallization resulting in twofold decrease in the dislocation density. The development of recovery in the present steel during annealing at temperatures of 900–1100°C could be expressed by Arrhenius-type relationship with a quite low activation energy of about 10 kJ/mol.
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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