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Materials 2017, 10(2), 139; doi:10.3390/ma10020139

Creep Rupture of the Simulated HAZ of T92 Steel Compared to that of a T91 Steel

1
Institute of Materials Engineering, National Taiwan Ocean University, Keelung 20224, Taiwan
2
Division of Nuclear Fuels and Materials, Institute of Nuclear Energy Research, Lungtan, Taoyuan 32546, Taiwan
*
Author to whom correspondence should be addressed.
Academic Editor: Michael Zinigrad
Received: 9 November 2016 / Revised: 17 January 2017 / Accepted: 26 January 2017 / Published: 8 February 2017
(This article belongs to the Special Issue Welding, Joining and Casting of Advanced Materials)
View Full-Text   |   Download PDF [14269 KB, uploaded 8 February 2017]   |  

Abstract

The increased thermal efficiency of fossil power plants calls for the development of advanced creep-resistant alloy steels like T92. In this study, microstructures found in the heat-affected zone (HAZ) of a T92 steel weld were simulated to evaluate their creep-rupture-life at elevated temperatures. An infrared heating system was used to heat the samples to 860 °C (around AC1), 900 °C (slightly below AC3), and 940 °C (moderately above AC3) for one minute, before cooling to room temperature. The simulated specimens were then subjected to a conventional post-weld heat treatment (PWHT) at 750 °C for two hours, where both the 900 °C and 940 °C simulated specimens had fine grain sizes. In the as-treated condition, the 900 °C simulated specimen consisted of fine lath martensite, ferrite subgrains, and undissolved carbides, while residual carbides and fresh martensite were found in the 940 °C simulated specimen. The results of short-term creep tests indicated that the creep resistance of the 900 °C and 940 °C simulated specimens was poorer than that of the 860 °C simulated specimens and the base metal. Moreover, simulated T92 steel samples had higher creep strength than the T91 counterpart specimens. View Full-Text
Keywords: T92 steel; simulated HAZ; creep rupture; post-weld heat treatment T92 steel; simulated HAZ; creep rupture; post-weld heat treatment
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Peng, Y.-Q.; Chen, T.-C.; Chung, T.-J.; Jeng, S.-L.; Huang, R.-T.; Tsay, L.-W. Creep Rupture of the Simulated HAZ of T92 Steel Compared to that of a T91 Steel. Materials 2017, 10, 139.

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