Formation of L12-ordered precipitation in an alumina-forming austenitic stainless steel via Cu addition and its contribution to creep/rupture resistance. (December 2015)

• Record Type: Journal Article
• Authors: Zhao, Bingbing; Fan, Jifu; Liu, Yize; Zhao, Lin; Dong, Xianping; Sun, Feng; Zhang, Lanting
• Is Part Of: Scripta materialia. Volume 109(2015)
• Page Start: 64
• Page End: 67
• Publication Date: 2015-12
• Subjects: Alumina-forming austenitic steel -- Creep -- L12-ordered precipitate -- Precipitation strengthening; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2015.07.019
• Languages: English
• ISSNs: 1359-6462

Abstract

Graphical abstract: Abstract: Addition of 2.8 wt.% Cu to an alumina-forming austenitic (AFA) stainless steel promotes formation of a L12 -ordered phase with the dominating elements Ni, Cu and Al, instead of B2-NiAl and Cu-rich phases as predicted by the phase equilibrium calculation. At 700 °C/150 MPa, the creep/rupture life of the AFA steel increases from 1537 h to 2047 h with the occurrence of the L12 -ordered phase. The nano-size L12 -ordered Ni–Cu–Al precipitates are uniformly distributed in the austenitic matrix with an average diameter of 35 ± 7 nm even after 2047 h creep/rupture testing.