Skip to main content
Article thumbnail
Location of Repository

Research on Precipitate Behavior during Holding Process of X80 Pipeline Steel

By Niu Tao, An Chenggang, Jiang Yongwen, Wu Xinlang, Zhang Caixia, Yu Chen and Dai Xiaoli

Abstract

PTT (Precipitate-Temperature-Time) curve of X80 pipeline steel was obtained by strain relaxation method. The evolution of precipitate particle size during holding process was simulated combined with kinetic calculation, and observed using TEM in the samples of industrial produced X80 steel with different holding time. It is revealed that the shape of PPT curve is typical “C” type with the nose temperature of 900°C and incubation time of about 5s. Kinetic calculation results show that the average particle size increases obviously with the increment of holding time. Meantime, after holding for 90s at 950°C, observation of industrial produced X80 steel reveals that the proportion of precipitate particles larger than 60nm increases dramatically, which basically agreed with the calculation results. Dissolved Nb can effectively reduce grain boundary mobility and retard recrystallization by solute drag effect. Therefore, it is strongly recommended to shorten the holding time without increasing holding temperature in industrial production, so that to reduce precipitate of Nb at high temperature, and increase the strength and toughness of steel

Topics: Engineering (General). Civil engineering (General), TA1-2040
Publisher: EDP Sciences
Year: 2016
DOI identifier: 10.1051/matecconf
OAI identifier: oai:doaj.org/article:caa47eab27634a59b804e4ac9c3a1b13
Journal:
Download PDF:
Sorry, we are unable to provide the full text but you may find it at the following location(s):
  • https://doaj.org/toc/2261-236X (external link)
  • http://dx.doi.org/10.1051/mate... (external link)
  • https://doaj.org/article/caa47... (external link)
  • Suggested articles


    To submit an update or takedown request for this paper, please submit an Update/Correction/Removal Request.