Paper Title:
An Investigation on Precipitation Behaviour of Cu-Rich Phase in Super304H Heat-Resistant Steel by Three Dimensional Atom Probe
  Abstract

Super304H, a Cu-containing 18Cr-9Ni-3CuNbN heat-resisting steel is wildly used as an superheater/reheater tube material for ultra-super-critical (USC) power plants all over the world. It is recognized that the Cu-rich phase is an important strengthening phase for Super304H. However, the detail precipitation behaviour and its strengthening effect are still not very clear. Investigated material was taken from routine production and was aged at 650°C for different times. The precipitation of Cu-rich phase in Super304H was studied by three dimensional atom probe (3DAP) and TEM. Experimental results show that Cu-rich clusters have been formed at very early stage of 650°C aging. The Cu-rich particle images have been clearly caught just after 650°C aging for 5h. The Cu atoms gradually concentrate to Cu-rich particles and the other elements (such as Cr, Ni etc) diffuse away from Cu-rich particles to γ-matrix with the increasing of aging time. The Cu-rich particle size and its density have been determined as a function of aging time. Cu-rich particles still keep nano-size and distribute homogenously in grains even after long time (1,000h) aging, which is one of the most important reasons for keeping good strength of Super304H heat-resistant steel at high temperatures.

  Info
Periodical
Materials Science Forum (Volumes 654-656)
Main Theme
Edited by
Jian-Feng Nie and Allan Morton
Pages
110-113
DOI
10.4028/www.scientific.net/MSF.654-656.110
Citation
C. Y. Chi, J. X. Dong, W. Q. Liu, X. S. Xie, "An Investigation on Precipitation Behaviour of Cu-Rich Phase in Super304H Heat-Resistant Steel by Three Dimensional Atom Probe", Materials Science Forum, Vols. 654-656, pp. 110-113, 2010
Online since
June 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: Xi Shan Xie, Jian Xin Dong, Mai Cang Zhang
Abstract:Inconel 718(Ni-19Cr-18Fe-3Mo-5Nb-1Ti-0.5Al) nickel-base superalloy strengthened mainly by Ni3Nb type γ″ and partially by Ni3Al type γ′...
262
Authors: Yong Yee Kim, Young Min Park, Hoy Yul Park, Hong Chae Park, Seog Young Yoon
Abstract:Monodispersed Cu powders were prepared in aqueous solution through a wet-reduction process with hydrazine hydrate (N2H4·H2O). In particular,...
2118
Authors: Xue Tao Yuan, Dong Bai Sun, Zhi Qiang Hua, Lei Wang
Abstract:The growth morphology and structure of deposits during the initial stages of amorphous Ni-P electrodeposition was studied using atomic force...
535
Authors: Zheng Min Li, Zhi Wei Chen, Min Tan, Ke Jing Xu, Bing Jiang
Abstract:Nano-TiO2 coating film is one of the efficient photocatalysts. The particle size distribution of TiO2 has important influence on...
22
Authors: Cheng Long Yu, Xin Hao, Hong Tao Jiang, Li Li Wang, Zheng Guang Zhang, Xiu Feng Wang
Chapter 1: Materials Science and Engineering
Abstract:α-Al2O3 platelets were prepared in the interface of Na2O-CaO-SiO2 glass induced by Al. The...
110