Failure of AISI 304H stainless steel elbows in a heat exchanger

被引：20

作者：

Bahrami, A. ^{[1
]}

Anijdan, S. H. Mousavi ^{[2
]}

Taheri, P. ^{[3
]}

Mehr, M. Yazdan ^{[1
,4
]}

机构：

[1] Isfahan Univ Technol, Dept Mat Engn, Esfahan 8415683111, Iran

[2] McGill Univ, Dept Min & Mat Engn, 3610 Univ St, Montreal, PQ H3A 2B2, Canada

[3] Delft Univ Technol, Dept Mat Sci & Engn, Mekelweg 2, NL-2628 CD Delft, Netherlands

[4] Delft Univ Technol, Fac EEMCS, Mekelweg 4, NL-2628 CD Delft, Netherlands

来源：

ENGINEERING FAILURE ANALYSIS | 2018年 / 90卷

关键词：

Failure; Heat exchanger; 304H stainless steel; Grain boundary oxidation; CORROSION; OXIDATION; WATER;

D O I：

10.1016/j.engfailanal.2018.04.006

中图分类号：

TH [机械、仪表工业];

学科分类号：

0802 ;

摘要：

This work investigates the effects of grain boundary oxidation on the failure of AISI 304H stainless steel elbows in a heat exchanger in a power plant after 8 years of service at 400 degrees C. Optical and electron microscopes, elemental mapping, electron dispersive spectroscopy (EDS), inductively-coupled plasma atomic energy spectroscopy (ICP-AES) and hardness tester were used to understand the failure mechanism. Elemental mapping of the samples operating for 8 years showed high concentrations of oxygen and carbon at the grain boundaries. Results showed that cracks were propagated along the grain boundaries due to the brittleness of the oxide layer at the boundaries. Results confirmed the intergranular and brittle nature of the fracture. Microhardness profilometry showed that oxidized/carburized grain boundaries are significantly harder than matrix inside grains.

引用

页码：397 / 403

页数：7

共 17 条

[1] Effective parameters modeling in compression of an austenitic stainless steel using artificial neural network [J].