Electron-ion-plasma modification of the structure and properties of commercial steels

7th International Conference Radiation-thermal Effects and Processes in Inorganic Materials

材料科学;物理学

Ivanov, Yu.^1,2 ; Klopotov, A.^2,3 ; Potekaev, A.^2 ; Koval, N.^1 ; Vlasov, V.^3,4

Institute of High Current Electronics of the SB RAS, 2/3 Akademicheskiy Ave., Tomsk

634055, Russia^1

National Research Tomsk State University, 36 Lenina str, Tomsk

634050, Russia^2

Tomsk State University of Architecture and Building, 2 Solyanaya Sq., Tomsk

634003, Russia^3

National Research Tomsk Polytechnic University, 30 Lenin str., Tomsk, Russia^4

关键词: Dendritic crystallization;    Electron beam processing;    Elemental compositions;    Equilibrium conditions;    Pulsed electron beams;    Rapid crystallization;    Structure and properties;    Thermo dynamic analysis;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/168/1/012070/pdf
DOI  :  10.1088/1757-899X/168/1/012070

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

The work is devoted to the structural-phase analysis of steels of the austenitic and martensitic grade, irradiated with a high-intensity pulsed electron beam of the submillisecond duration of exposure in the mode of the surface layer melting. A thermodynamic analysis of phase transformations occurring during heat treatment in alloys of the composition Fe-Cr-C and Fe-Cr-Ni-C, which are the basis of steels 20X13 and 12X18H10T, is carried out. It is shown that formation of solid solutions on the basis of α-iron (BCC crystalline lattice) and γ-iron (FCC crystalline lattice) as well as the entire range of carbide phases of a complex elemental composition (M23C6, M7C3HM3C, where symbol M refers to atoms of metallic elements Fe, Cr, and Ni) is possible in equilibrium conditions in given materials. The irradiation of steels 12X18H10T and 20X13 with a high-intensity pulsed electron beam of the submillisecond duration of exposure is carried out. It is shown that the electron-beam processing of steel in the melting mode and the subsequent rapid crystallization is accompanied by a significant transformation of the surface layer structure, consisting in complete dissolution of original carbide phase particles; in formation of dendritic crystallization cells of submicron sizes; in occurrence of martensitic γ→α and γ→ transformation; in re-allocation of nanosized particles of carbide and intermetallic phases.