Paper Title:
Microstructure Evolution in a 3%Co Modified P911 Heat Resistant Steel under Creep Conditions
  Abstract

The microstructural changes in a 3%Co modified P911 heat resistant steel were examined under static annealing and creep at elevated temperatures. The quenched steel was tempered at temperatures ranging from 673 to 1073 K for 3 hours. The temperature dependence of hardness for the tempered samples exhibits the maximum at 723 – 823 K which is associated with the precipitations of fine carbides with an average size of about 20 nm. The transverse lath size of martensitic structure is  200 nm after air quenching and remains unchanged under tempering at temperatures below 800 K. An increase in tempering temperature to 1073 K resulted in hardness drop. Coagulation of carbides and growth of martensitic laths takes place at these temperatures. The creep tests were carried out at 873 and 923 K up to rupture, which occurred after about 4.5 × 103 hours. The structural changes in crept specimens were characterized by the development of coarse laths/subgrains. The mean transverse size of which was  0.67 and  1.3 m after the creep tests at 873 and 923 K, respectively. On the other hand, an average size of second phase particles of  165 nm was observed in the samples tested at both temperatures.

  Info
Periodical
Advanced Materials Research (Volumes 89-91)
Edited by
T. Chandra, N. Wanderka, W. Reimers , M. Ionescu
Pages
295-300
DOI
10.4028/www.scientific.net/AMR.89-91.295
Citation
A. Kipelova, R. Kaibyshev, A. Belyakov, I. Schenkova, V. Skorobogatykh, "Microstructure Evolution in a 3%Co Modified P911 Heat Resistant Steel under Creep Conditions", Advanced Materials Research, Vols. 89-91, pp. 295-300, 2010
Online since
January 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: Vàclav Sklenička, Květa Kuchařová, Milan Svoboda, Ivan Saxl
Abstract:Critical high temperature components of machines and structures are often subjected to complicated load and temperature histories. The...
81
Authors: Aleksey Korneev, D.S. Zmienko, A.S. Gudenko, P.A. Kozlov, A.E. Korneev
Chapter 6: Energy Materials
Abstract:Our report deals with investigation of evolution of AB2 phase in three melts of new 9% Cr heat resistant steel with different...
865
Authors: Valeriy Dudko, Andrey Belyakov, Vladimir Skorobogatykh, Izabella Schenkova, Rustam Kaibyshev
Poster Session 1
Abstract:Structural changes in a 9%Cr martensitic steel after 1%, 4% creep and creep rupture test at 650°C and stress of 118 MPa were examined. Heat...
895
Authors: Evgeniy Tkachev, Marina Odnobokova, Alla Kipelova, Andrey Belyakov, Rustam Kaibyshev
Chapter 2: Contributed Papers
Abstract:The microstructure and creep properties of a P911-type steel normalized at 1060°C and then subjected to one-step tempering at 760°C for 3 h...
1963