Microstructural evolution during aging at 800 ○C and its effect on the magnetic behavior of UNS S32304 lean duplex stainless steel

被引：16

作者：

Dille, J. ^{[1
]}

Areiza, M. C. L. ^{[2
]}

Tavares, S. S. M. ^{[3
]}

Pereira, G. R. ^{[1
]}

De Almeida, L. H. ^{[1
]}

Rebello, J. M. A. ^{[1
]}

机构：

[1] Univ Fed Rio de Janeiro, COPPE, Ctr Tecnol, Met & Mat Engn, Cidade Univ,Bloco F, BR-21941914 Rio De Janeiro, Brazil

[2] Univ Fed Rio de Janeiro, Dept Met & Mat Engn, Lab Nondestruct Testing Corros & Welding, BR-21941596 Rio De Janeiro, RJ, Brazil

[3] Univ Fed Fluminense, Dept Engn Mecan, Rua Passo Patria 156, BR-24210240 Niteroi, RJ, Brazil

来源：

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS | 2017年 / 426卷

关键词：

Lean duplex stainless steel; Precipitation; Magnetic properties; Eddy current non-destructive testing; STEM analysis; PHASE PRECIPITATION; AUSTENITE;

D O I：

10.1016/j.jmmm.2016.11.026

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Duplex stainless steels are high strength and corrosion resistant alloys extensively used in chemical and petrochemical industries. However, exposition to temperatures in the range 300-1000 C-circle leads to precipitation of different phases having a detrimental effect on the mechanical properties and on the corrosion resistance of the alloy. In this work, the microstructural evolution during aging of a UNS S32304 lean duplex stainless steel was investigated by scanning electron microscopy, transmission electron microscopy and magnetic force microscopy. Formation of secondary austenite as well as Cr2N and Cr23C6 precipitation and, consequently, a decrease of ferrite volume fraction were observed. EDX analysis indicated that secondary austenite is depleted in chromium which is detrimental to the corrosion resistance of the alloy. A variation of magnetic properties and Eddy current measurement parameters during aging was simultaneously detected and can be explained by the decrease of ferrite volume content. Therefore, Eddy current non-destructive testing can be successfully applied to detect the formation of deleterious phases during aging.

引用

页码：102 / 107

页数：6

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