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Volume 47, Issue 5 (September 2019)
Special Issue Paper
A Study of Precipitation-Strengthened Creep-Resistant Austenitic Stainless Steel for Supercritical and Ultra-Supercritical Power Plants
(Received 18 July 2017; accepted 17 May 2018)
Published Online: 2018
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The properties of precipitation-hardened austenitic stainless steels are adversely affected by the precipitation of unwanted brittle phases, like sigma (nonmagnetic intermetallic phase that is composed of iron and chromium) and Laves (Fe2Nb). These stainless steels are also susceptible to stress corrosion cracking. The induced residual stress in the material in turn reduces its creep strength. The strain beyond a certain limit affects its creep-resistant property appreciably, and hence, beyond a certain strain, these stainless steels are to be solution-treated for stress relief. Characterization studies on precipitation-strengthened creep-resistant austenitic stainless steel are presented in this article. Effects of strain and aging on microstructures are also evaluated. In order to understand the precipitation-strengthening behavior and effect of strain on Super304H (CC2328-2), the material was strained and aged at 650°C for a period ranging from 7 h to 4 weeks, and then the microstructures were studied using an optical microscope. Experiments were carried out on tubes with no strain and tubes with strain, which were aged at 650°C. The results show that beyond a threshold strain of ∼17 %, the material becomes deteriorated, and to regain its original microstructure, solid solution treatment is necessitated.
Department of Applied Mechanics, Indian Institute of Technology Delhi, Noida,
Department of Mechanical Engineering, Indian Institute of Technology Delhi, Hauz Khas,
Department of Applied Mechanics, Indian Institute of Technology Delhi, Hauz Khas,
Stock #: JTE20170418
Title A Study of Precipitation-Strengthened Creep-Resistant Austenitic Stainless Steel for Supercritical and Ultra-Supercritical Power Plants