Effect of vanadium on the precipitation strengthening upon tempering of a high-strength pipe steel with different initial structure / Sych O. V.,Kruglova A. A.,Schastlivtsev V. M.,Tabatchikova T. I.,Yakovleva I. L. // PHYSICS OF METALS AND METALLOGRAPHY. - 2016. - V. 117, l. 12. - P. 1270-1280.

ISSN/EISSN:

0031-918X / 1555-6190

Type:

Article

Abstract:

Methods of metallography, scanning electron, and transmission electron microscopies were used to study the structure of two pipe steels (without vanadium and with 0.03\% vanadium) subjected to gamma -> alpha isothermal transformation at temperatures of 400-600A degrees C (initial structure) and tempering at 600-650A degrees C. It has been found that the addition of 0.03\% vanadium intensifies the process of the precipitation of ferrite and contributes to the formation of a granular structure. It has been shown that, in high-strength pipe steels with 0.03\% vanadium, which have bainitic granular-type structures, the effect of the precipitation strengthening is effected upon subsequent high-temperature tempering at 600-630A degrees; the addition of vanadium leads to an increase in the hardness by 16 HV. In the presence of bainite of the lath type in the initial structure, the subsequent tempering leads to a softening associated with the processes of the recovery, polygonization, and initial stages of recrystallization in situ, which develops at temperatures above 640A degrees C. It has been found that the hardness of the steel without vanadium upon additional tempering decreases regardless of the morphology of structural constituents in the initial structure.

Author keywords:

pipe steel; hardness; ultimate tensile strength; microstructure; lath bainite; granular bainite; ferrite; precipitation hardening THERMOMECHANICAL TREATMENT; CARBON; SIMULATION; EVOLUTION; NB

DOI:

10.1134/S0031918X16120152

Web of Science ID:

ISI:000390063000012

Соавторы в МНС:

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Другие поля

Поле	Значение
Month	DEC
Publisher	MAIK NAUKA/INTERPERIODICA/SPRINGER
Address	233 SPRING ST, NEW YORK, NY 10013-1578 USA
Language	English
EISSN	1555-6190
Keywords-Plus	THERMOMECHANICAL TREATMENT; CARBON; SIMULATION; EVOLUTION; NB
Research-Areas	Metallurgy \& Metallurgical Engineering
Web-of-Science-Categories	Metallurgy \& Metallurgical Engineering
Author-Email	npk3@crism.ru
ResearcherID-Numbers	Schastlivtsev, Vadim/I-5825-2013 Yakovleva, Irina/J-6793-2013 Табатчикова, Татьяна/J-4297-2013
ORCID-Numbers	Schastlivtsev, Vadim/0000-0002-2312-1169 Yakovleva, Irina/0000-0001-8918-3066 Табатчикова, Татьяна/0000-0002-4208-0868
Funding-Acknowledgement	Ural Branch, Russian Academy of Sciences {[}15-15-2-16]
Funding-Text	The work was performed within the framework of the Federal Task according to the theme ``Struktura{''} (no. 01201463331) and was supported in part by the Ural Branch, Russian Academy of Sciences (project no. 15-15-2-16).
Number-of-Cited-References	18
Usage-Count-Last-180-days	2
Usage-Count-Since-2013	2
Journal-ISO	Phys. Metals Metallogr.
Doc-Delivery-Number	EF1CP