Paper Title:
Effects of Overall Grain Boundary Nature on Localized Corrosion in Austenitic Stainless Steels
  Abstract

Thermo-mechanical processing of type 304 and type 316L stainless steels done by (a) cold rolling to a reduction in thickness of 20 to 80 percent and (b) solution annealing to obtain a medium size of grains led to a considerable improvement in resistance to both sensitization and intergranular corrosion. The nature of the resultant grain boundaries was examined in a scanning electron microscope using orientation imaging microscopy in electron back scattered diffraction mode. Fraction of random and special grain boundaries were established for each set of thermo-mechanical processing. After appropriate sensitization treatments, the degrees of sensitization of these stainless steels were evaluated by double loop electrochemical potentiokinetic reactivation tests. Standard ASTM tests were used to evaluate susceptibility to intergranular corrosion (IGC) and intergranular stress corrosion cracking (IGSCC). These studies showed that a particular combination of thermomechanical processing led to formation of over 75 percent random grain boundaries in the steels and this imparted resistance to sensitization and to IGC and IGSCC. This opens a new concept in grain boundary (GB) engineering of a high fraction of random GB increasing the resistance to localized corrosion like IGC and IGSCC. Textural studies were carried out with the help of X-ray and MTM-FHM software. It showed significant change of texture in type 304 stainless steel, while no change in the texture of type 316L stainless steel after cold rolling and annealing.

  Info
Periodical
Materials Science Forum (Volumes 467-470)
Edited by
B. Bacroix, J.H. Driver, R. Le Gall, Cl. Maurice, R. Penelle, H. Réglé and L. Tabourot
Pages
813-818
DOI
10.4028/www.scientific.net/MSF.467-470.813
Citation
D.N. Wasnik, V. Kain, I. Samajdar, B. Verlinden, P.K. De, "Effects of Overall Grain Boundary Nature on Localized Corrosion in Austenitic Stainless Steels", Materials Science Forum, Vols. 467-470, pp. 813-818, 2004
Online since
October 2004
Export
Price
$32.00
Share

In order to see related information, you need to Login.

In order to see related information, you need to Login.

Authors: Byung Bok Choi, Dong Ho Bae
Abstract:Austenitic stainless steel is a useful material for various industrial facilities such as the nuclear and steam power plant and the heavy...
9
Authors: Naoya Masahashi, M. Oku, Sadao Watanabe, Shuji Hanada
Abstract:The laminated composite of Fe–Al alloy and CrMo steel was fabricated by clad rolling to provide additional properties to the steel such as...
866
Authors: Sen Yang, Hiroyuki Kokawa, Zhan Jie Wang
Abstract:In order to modify grain boundary character distribution (GBCD) and to improve intergranualr corrosion (IGC) resistance of 304 stainless...
2473
Authors: Wei Tang, He Xue, Dan Zhao
Abstract:Environmentally assisted cracking (EAC) or stress corrosion cracking (SCC) of key structural materials in the environments of the light water...
1128
Authors: Yong Jiang, Jian Ming Gong, Zheng Gang Yu, Dong Song Rong
Abstract:In this paper, mechanical performance test, slow strain rate test (SSRT) and optical microscopy analysis were employed in studying the effect...
34