Affordable Access

Access to the full text

Effect of vanadium on the precipitation strengthening upon tempering of a high-strength pipe steel with different initial structure

Authors
  • Sych, O. V.1
  • Kruglova, A. A.1
  • Schastlivtsev, V. M.2
  • Tabatchikova, T. I.2
  • Yakovleva, I. L.2
  • 1 Prometei Central Research Institute of Structural Materials, ul. Shpalernaya 49, St. Petersburg, 191015, Russia , St. Petersburg (Russia)
  • 2 Russian Academy of Sciences, Institute of Metal Physics, Ural Branch, ul. S. Kovalevskoi 18, Ekaterinburg, 620137, Russia , Ekaterinburg (Russia)
Type
Published Article
Journal
The Physics of Metals and Metallography
Publisher
Pleiades Publishing
Publication Date
Dec 15, 2016
Volume
117
Issue
12
Pages
1270–1280
Identifiers
DOI: 10.1134/S0031918X16120152
Source
Springer Nature
Keywords
License
Yellow

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 γ → α isothermal transformation at temperatures of 400–600°C (initial structure) and tempering at 600–650°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 600–630°; 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 640°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.

Report this publication

Statistics

Seen <100 times