Paper Title:
Deformation Behavior in Pipe Production Process for New High Strength Microalloyed Steel
  Abstract

The influence of forming process on mechanical properties and microstructure of high strength microalloyed steel has been studied in this research. All samples selected from 90º and 180º of pipes in transverse and longitudinal orientations after UOE forming. The steel was supplied as a hot rolled plate with accelerated cooling. Microstructure of the micro alloy steel was various combinations of acicular ferrite, granular ferrite and M/A phases. Charpy impact fracture toughness tests were carried out in -50 °C to 0 °C. Minimum and maximum yield strength appears in the 180º and 90º of pipe in longitudinal and transverse orientations respectively. Increasing in the yield strength related to minimum amount was about 5.8 % after UOE forming. Comparison between yield strength after and before forming appears increased about 6.9 % due to forming. With decreasing in the test temperature from -50 °C to 0 °C, fracture energy decrease up to 0.9 % that it’s very little and relinquishment. However for samples that fractured in the temperature of -50 °C difference between highest and lowest energy was about 5.9 %. Charpy test results appear that fine M/A phase not a major factor on decrease of upper shelf energy, if homogenize distributed in the acicular ferrite matrix.

  Info
Periodical
Advanced Materials Research (Volumes 383-390)
Chapter
Chapter 11: Materials Behavior
Edited by
Wu Fan
Pages
3207-3211
DOI
10.4028/www.scientific.net/AMR.383-390.3207
Citation
S. Moeinifar, "Deformation Behavior in Pipe Production Process for New High Strength Microalloyed Steel", Advanced Materials Research, Vols. 383-390, pp. 3207-3211, 2012
Online since
November 2011
Export
Price
$32.00
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