Structural and phase transformations and micromechanical properties of the high-nitrogen austenitic steel deformed by shear under pressure / Makarov A. V.,Luchko S. N.,Shabashov V. A.,Volkova E. G.,Osintseva A. L.,Zamatovskii A. E.,Litvinov A. V.,Sagaradze V. V. // PHYSICS OF METALS AND METALLOGRAPHY. - 2017. - V. 118, l. 1. - P. 52-64.

ISSN/EISSN:

0031-918X / 1555-6190

Type:

Article

Abstract:

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.

Author keywords:

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

DOI:

10.1134/S0031918X17010045

Web of Science ID:

ISI:000395027200007

Соавторы в МНС:

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Другие поля

Поле	Значение
Month	JAN
Publisher	MAIK NAUKA/INTERPERIODICA/SPRINGER
Address	233 SPRING ST, NEW YORK, NY 10013-1578 USA
Language	English
EISSN	1555-6190
Keywords-Plus	PLASTIC-DEFORMATION; STAINLESS-STEELS; ELASTIC-MODULUS; ALLOYS; INDENTATION; TRANSITIONS; SURFACES; HARDNESS; LAYERS; STATE
Research-Areas	Metallurgy \& Metallurgical Engineering
Web-of-Science-Categories	Metallurgy \& Metallurgical Engineering
Author-Email	avm@imp.uran.ru
ResearcherID-Numbers	Sagaradze, Victor/J-5570-2013 Makarov, Aleksey/D-5663-2016
ORCID-Numbers	Sagaradze, Victor/0000-0002-6426-3382 Makarov, Aleksey/0000-0002-2228-0643
Funding-Acknowledgement	Russian Scientific Foundation {[}14-13-00908]
Funding-Text	The electron-microscopy investigation and microindentation were conducted at the Testing Center of Nanotechnologies and Nanomaterials Center of Collaborative Access of the Institute of Metal Physics of the Ural Branch of the Russian Academy of Science. XRDA and microhardness measurements were performed at the Plastometry Center of Collaborative Access of the Institute of Machine Science of the Ural Branch of the Russian Academy of Science. The investigation was supported by the Russian Scientific Foundation (project no. 14-13-00908). The authors are grateful to Prof. Ts. Rashev, who kindly supplied us with the material for our investigation.
Number-of-Cited-References	38
Usage-Count-Last-180-days	3
Usage-Count-Since-2013	3
Journal-ISO	Phys. Metals Metallogr.
Doc-Delivery-Number	EM0SE