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Title: The negative effect of Zr addition on the high temperature strength in alumina-forming austenitic stainless steels

The effect of a Zr addition on the precipitation behavior and mechanical properties in Nb-containing alumina-forming austenitic (AFA) stainless steels was investigated using tensile tests, scanning electron microscopy (SEM), and scanning transmission electron microscopy (STEM) analysis. The TEM observation showed that a Zr addition led to the formation of a (Nb,Zr)(C,N) complex particle, which coarsened the Nb-rich carbonitride. Tensile tests were performed at an elevated temperature (700 °C), and both the tensile and yield strengths decreased with a Zr addition. This unexpected result of a Zr addition was due to the reduction of the precipitation strengthening by particle coarsening. - Highlights: • The effect of Zr on high temperature strength in AFA steel containing Nb was studied. • Both the tensile and yield strengths of an AFA steel decreased with Zr-addition. • This is due to the reduction of precipitation strengthening by particle coarsening. • Nb(C,N) and (Nb,Zr)(C,N) particles were precipitated in an AFA and Zr-added AFA steel. • The size of (Nb,Zr)(C,N) particle is much bigger than that of Nb(C,N) particle.
Authors:
 [1] ;  [1] ;  [2] ; ;  [1]
  1. Ferrous Alloy Department, Advanced Metallic Materials Division, Korea Institute of Materials Science, 797 Changwondaero, Seongsangu, Changwon, Gyeongnam, 642-831 (Korea, Republic of)
  2. (Korea, Republic of)
Publication Date:
OSTI Identifier:
22288718
Resource Type:
Journal Article
Resource Relation:
Journal Name: Materials Characterization; Journal Volume: 87; Other Information: Copyright (c) 2013 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ALUMINIUM OXIDES; AUSTENITIC STEELS; PARTICLES; PRECIPITATION; SCANNING ELECTRON MICROSCOPY; STAINLESS STEELS; TRANSMISSION ELECTRON MICROSCOPY; YIELD STRENGTH; ZIRCONIUM