Journal
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
Volume 6, Issue 2, Pages 116-122Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jmrt.2016.05.004
Keywords
Super 304HCu; High temperature tensile properties; Strain hardening behaviour; K-M plots
Funding
- Mailam India Ltd., Pondicherry, India through the Mailam India Research (MIR) Fellowship
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Super 304HCu austenitic stainless steel containing 2.3-3 (wt.%) of Cu is mainly used in superheaters and reheaters tubing of ultra super critical boilers which operates over 600 degrees C of steam temperature. Tensile tests were carried out on Super 304HCu, using nominal strain rate of 1 x 10(-3) s(-1), at room temperature, 550 degrees C, 600 degrees C and 650 degrees C. The tensile strength and elongation were found to decrease with increase in test temperature. The stress strain curves were fitted using Hollomon equation to determine the strain hardening exponent value. Differential Crussard-Jaoul (C-J) analysis of the tensile curve is used to determine the variation in strain hardening exponent. Kocks-Mecking (K-M) type plots were used to determine the stages of strain hardening during tensile loading of the specimen. The strain hardening capacity of the Super 304HCu is found to decrease with increase in test temperature. (C) 2016 Brazilian Metallurgical, Materials and Mining Association. Published by Elsevier Editora Ltda. This is an open access article under the CC BY-NC-ND license.
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