Paper Title:
Effects of N Content on Microstructure and Properties of SAF2906 Casting Super Duplex Stainless Steel after Cryogenic Treatment
  Abstract

SAF2906 is a new kind of super duplex stainless steel, and more corrosion-resistant and strong than SAF2507, suitable to be used in the low temperature and corrosion conditions. In order to prevent the occurrence of microstructure changes resulting in the property deterioration, in the general, the castings made for SAF2906 should be cryogenically treated before they are used in the ultra low conditions. N is an alloying element, usually added to stainless steels to increase the material properties. So, In this paper, the effects of N content on microstructure, mechanical and corrosion resistance properties of SAF2906 casting super duplex stainless steel (SDSS) after cryogenic treatment were studied by means of Optical Microscope(OM), X-ray Diffraction(XRD) and electrochemical workstation. The results indicate that N can increase the amount of γ phase according to a linear relationship of Φ(γ)=99.4×w(N)+6.16. When N content is low or medial, γ phase can precipitate from ferrite. When N content is high, γ phase does not precipitate from ferrite and is converted directly from ferrite and austenite grain boundaries. The higher N content, the greater tensile strength and elongation, the better corrosion resistance. Compared with solution state, cryogenic treatment can improve corrosion resistance.

  Info
Periodical
Advanced Materials Research (Volumes 139-141)
Edited by
Liangchi Zhang, Chunliang Zhang and Tielin Shi
Pages
670-676
DOI
10.4028/www.scientific.net/AMR.139-141.670
Citation
H. L. Xiang, D. Liu, W. L. Huang, F. S. He, "Effects of N Content on Microstructure and Properties of SAF2906 Casting Super Duplex Stainless Steel after Cryogenic Treatment", Advanced Materials Research, Vols. 139-141, pp. 670-676, 2010
Online since
October 2010
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: Su Qiu Jia, Guo Jun Liu, Qi Shuang Chen
Abstract:Mg-7.3Al magnesium alloys were investigated in the paper. The paper presents microstructural characterization of Mg-7.3Al alloy after casting...
585
Authors: Feng Jun Lang, Ying Ma, Jian Rong Liu, Xian Qiu Huang, Mou Cheng Li
Chapter 1: Surface Engineering/Coatings
Abstract:The influence of passivation on pitting corrosion of 316L stainless steel in concentrated seawater was investigated by using cyclic anodic...
127
Authors: S.A. Sonawane, V.K. Tripathi, S.D. Ambekar
Chapter 6: Materials and Materials Processing in Mechanical Engineering
Abstract:The technique of cryogenic treatment of cutting tools is an inexpensive permanent treatment process that improves the physical and mechanical...
395
Authors: C.A. Jagadish, Nadig Priyanka
Chapter 5: Materials Processing Technologies
Abstract:Maraging steels belong to the class of steels that are found to have a unique combination of ultra-high strength and good fracture toughness,...
114