The Effect of Phase Transformations During Electrom-Beam 3D-Printing and Post-Built Heat Treatment on Plastic Deformation and Fracture of Additively Manufactured High Nitrogen Cr-Mn Steel

被引：2

作者：

Astafurova, E. G. ^{[1
]}

Reunova, K. A. ^{[1
]}

Astafurov, S., V ^{[1
]}

Panchenko, M. Yu ^{[1
]}

Melnikov, E., V ^{[1
]}

Moskvina, V. A. ^{[1
]}

Maier, G. G. ^{[1
]}

Rubtsov, V. E. ^{[1
]}

Kolubaev, E. A. ^{[1
]}

机构：

[1] Russian Acad Sci, Inst Strength Phys & Mat Sci, Siberian Branch, Tomsk, Russia

来源：

RUSSIAN PHYSICS JOURNAL | 2021年 / 64卷 / 07期

关键词：

nitrogen steel; additive technologies; electron-beam; 3D-printing; austenite; ferrite; plastic deformation; fracture; WIRE; MICROSTRUCTURE; CORROSION; FERRITE;

D O I：

10.1007/s11182-021-02442-y

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The phase composition, plastic deformation and fracture micromechanisms of Fe-(25-26)Cr-(5-12)Mn-0.15C-0.55N (wt.%) high-nitrogen chromium-manganese steel, manufactured by electron-beam 3D-printing (additive manufacturing) and subjected to heat treatment (at a temperature of 1150 degrees C followed by quenching), are studied. In order to identify the effect of the electron-beam 3D-printing process on the phase composition, microstructure and mechanical properties of high-nitrogen steel, the data obtained are compared with those for Fe-21Cr-22Mn-0.15C-0.53N austenitic steel (wt.%) formed by traditional methods (casting and heat treatment) and used as a material for additive manufacturing. It is experimentally observed that in the specimens formed by additive manufacturing, the depletion of the steel composition in manganese during the electron-beam 3D-printing and post-built heat treatment contributes to the formation of a macro- and microscopically inhomogeneous two-phase structure. The steel specimens contain irregularly shaped macroscopic regions with large ferrite grains or with a two-phase austenite-ferrite structure (microscopic inhomogeneity). Despite the change in the concentration of the basic elements (chromium and manganese) in additive manufacturing, there remains a high concentration of interstitial atoms (nitrogen and carbon). This contributes to a macroscopically heterogeneous distribution of interstitial atoms in the specimens - the formation of a supersaturated interstitial solid solution in the austenitic regions due to the low solubility of nitrogen and carbon in the ferrite regions. This inhomogeneous heterophase (ferrite-austenite) structure exhibits high strength properties, good ductility and work hardening, which are close to those of the specimens of the initial high-nitrogen austenitic steel used as the raw material for additive manufacturing.

引用

页码：1183 / 1190

页数：8

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