http://scholars.ntou.edu.tw/handle/123456789/4603
標題: | Creep Rupture of the Simulated HAZ of T92 Steel Compared to that of a T91 Steel | 作者: | Yu-Quan Peng Tai-Cheng Chen Tien-Jung Chung Sheng-Long Jeng Rong-Tan Huang Leu-Wen Tsay |
關鍵字: | T92 steel;simulated HAZ;creep rupture;post-weld heat treatment | 公開日期: | 二月-2017 | 卷: | 10 | 期: | 2 | 起(迄)頁: | 139 | 來源出版物: | Materials | 摘要: | 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. |
URI: | http://scholars.ntou.edu.tw/handle/123456789/4603 | ISSN: | 1996-1944 | DOI: | 10.3390/ma10020139 |
顯示於: | 光電與材料科技學系 |
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