01N17K12M5T Maraging steel under conditions of superfast solidification and high-speed pressing
Tóm tắt
During rapid hardening of 01N17K12M5T steel there are significant changes in its structure and properties. The grain size becomes finer, there is a reduction in the degree of chemical inhomogeneity, and the hardness increases. Foils produced by the “hammer and anvil” method have an extremely dispersed martensitic structure with a martensitic plate width of 0.3–0.4 μm and a hardness of up to 10,000 MPa, which, is an indication of the decisive role of interfaces in strengthening of metal. Rapidly hardened foils may be briquetted at room temperature to a relative density of 85%. Subsequent high-velocity pressing increases the relative density of the briquettes to 95%. The nonuniform temperature distribution and high rate of deformation accompanying high-velocity pressing leads to nonuniformity in the phase transformation and strengthening of chemical inhomogeneity of the material. The high rate of cooling after loading fixes at room temperature the martensitic body-centered cubic phase and austenite of two types differing in chemical composition and accordingly in temperatures of the martensite transformation. The structural and chemical inhomogeneity of 01N17K12M5T steel introduced by a shock wave is so significant that it is not completely eliminated after a 1-h hold at the austenitizing temperature.
Tài liệu tham khảo
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