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Title: Creep Rupture of the Simulated HAZ of T92 Steel Compared to that of a T91 Steel
Authors: Peng YQ
Chen TC
Chung TJ
Jeng SL
Huang RT
Tsay LW
Contributors: 國立臺灣海洋大學:光電與材料科技學系
Keywords: T92 steel
creep rupture
post-weld heat treatment
simulated HAZ
Date: 2017-02
Issue Date: 2018-08-16T06:55:51Z
Publisher: Materials
Abstract: 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.
Relation: 10(2)
URI: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/48219
Appears in Collections:[光電科學研究所] 期刊論文

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