Chi-phase precipitation in a duplex stainless steel

被引：193

作者：

Escriba, D. M. ^{[1
]}

Materna-Morris, E. ^{[2
]}

Plaut, R. L. ^{[1
]}

Padilha, A. F. ^{[1
]}

机构：

[1] EPUSP, Dept Met & Mat Engn, Ribeirao Preto, Brazil

[2] Forschungszentrum Karlsruhe, Inst Mat Forsch 1, D-76021 Karlsruhe, Germany

来源：

MATERIALS CHARACTERIZATION | 2009年 / 60卷 / 11期

关键词：

Duplex stainless steel; Aging; Microstructure; chi-phase; sigma-phase; SIGMA-PHASE;

D O I：

10.1016/j.matchar.2009.04.013

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The aim of this study is to investigate the precipitation of intermetallic phases, especially the chi-phase, in a 4SN (type UNS S31803) duplex stainless steel through aging heat-treatments carried out at 700 and 750 degrees C. Two intermetallic phases are detected: chi (chi) and sigma (sigma). The chi-phase precipitates at ferrite/ferrite grain boundaries prior to the sigma-phase precipitation, which occurs preferentially at ferrite/austenite interfaces and at ferrite/ferrite grain boundaries. The sigma-phase precipitation is a eutectoid type reaction of ferrite leading to sigma-phase phase and austenite. The chi-phase is consumed in the sigma-phase precipitation after becoming completely surrounded by both the sigma-phase and the newly formed austenite. (C) 2009 Elsevier Inc. All rights reserved.

引用

页码：1214 / 1219

页数：6

共 14 条

[1] A NEW INTERMETALLIC PHASE IN ALLOY STEELS [J].