Structural and phase transformations and micromechanical properties of the high-nitrogen austenitic steel deformed by shear under pressure

被引：13

作者：

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

Luchko, S. N. ^{[1
]}

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

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

Osintseva, A. L. ^{[2
]}

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

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

Sagaradze, V. V. ^{[1
]}

机构：

[1] Russian Acad Sci, Mikheev Inst Met Phys, Ural Branch, Ul S Kovalevskoi 18, Ekaterinburg 620990, Russia

[2] Russian Acad Sci, Inst Machine Sci, Ural Branch, Ul Komsomolskaya 34, Ekaterinburg 620049, Russia

来源：

PHYSICS OF METALS AND METALLOGRAPHY | 2017年 / 118卷 / 01期

基金：

俄罗斯科学基金会;

关键词：

austenitic steel; nitrogen; shear under pressure; nanostructurizing; dissolution of nitrides; micromechanical properties; PLASTIC-DEFORMATION; STAINLESS-STEELS; ELASTIC-MODULUS; ALLOYS; INDENTATION; TRANSITIONS; SURFACES; HARDNESS; LAYERS; STATE;

D O I：

10.1134/S0031918X17010045

中图分类号：

TF [冶金工业];

学科分类号：

0806 ;

摘要：

Using transmission electron microscopy, X-ray diffraction analysis, Mossbauer spectroscopy, microdurometry, and microindentation, the effect of large plastic deformations (through shear under pressure in Bridgman anvils) on the structure, phase composition, and micromechanical properties of high-nitrogen (1.24 wt % N) 08Kh22GA1.24 steel has been investigated. The steel was obtained by the casting method with counterpressure of nitrogen and was subjected to different heat treatments (quenching from1180A degrees D, aging at 450 and 550A degrees D) that form an austenitic (FCC) structure of the metallic matrix with chromium nitrides. It has been established that deformation by shear under pressure at room temperature results in the dispersion and deformation-induced partial dissolution of primary nitrides Cr2N in quenched and aged steel and in the complete (after aging at 450A degrees D) and partial (after aging at 550A degrees D) dissolution of secondary nitrides CrN. It has been noted that, for aged steel that contains finely dispersed secondary chromium nitrides upon shear deformation, as compared to the quenched state, the dispersion of the austenitic structure (down to nano- and submicrocrystalline states) is more intense and the enhancement in the microhardness and resistance to elastic-plastic deformations upon contact loading is more effective.

引用

页码：52 / 64

页数：13

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