http://scholars.ntou.edu.tw/handle/123456789/4677
標題: | Effects of Thermal Simulation on the Creep Fracture of the Mod. 9Cr-1Mo Weld Metal | 作者: | Liao, C. C. Wang, C. C. Chen, T. C. Shiue, R. K. Leu-Wen Tsay |
關鍵字: | mod. 91 weld metal;thermal simulation;creep rupture;post-weld tempering | 公開日期: | 九月-2020 | 卷: | 10 | 期: | 9 | 起(迄)頁: | 1181 | 來源出版物: | Metals | 摘要: | The effects of thermal simulation on the short-term creep fracture of modified 91 (mod. 91) weld metal (WM) were evaluated at elevated temperature. The reheated zones in the WM during multiple passes were simulated by an infrared heater. The simulated WM specimens after post-weld tempering at 1023 K/2 h were loaded with dead weight either at 903 K/120 MPa or 933 K/80 MPa. In this work, the simulated WM specimens after tempering were loaded either at 903 and 933 K during the tests. The loss in creep lives of various specimens at elevated temperature was determined accordingly and further compared with the Gr. 91 steel base metals, which were normalized either at 1213 K or 1333 K and then tempered at 1033 K for 2 h. The coarse, solidified structure of the WM had much better creep resistance than the base metal even that of the base metal normalized at 1333 K. However, the imposed welding thermal cycles would cause a significant decrease in creep resistance of the WM. Creep lives were shortened obviously in the simulated WM samples, especially in the simulated sample that underwent partial transformation. The combination of a fine-grained structure and soft ferrite present in the simulated WM was responsible for their huge decline in creep resistance, as compared with the WM in the as-tempered condition. |
URI: | http://scholars.ntou.edu.tw/handle/123456789/4677 | DOI: | 10.3390/met10091181 |
顯示於: | 光電與材料科技學系 |
在 IR 系統中的文件,除了特別指名其著作權條款之外,均受到著作權保護,並且保留所有的權利。