Microstructural Evolution of TP347H upon Long-Term Service in Power Plants

摘要：

　　Effects of welding and long-term service on the microstructural evolution of superheater tubes of TP347H stainless steel used in power plants were investigated by optical microscope (OM), scanning electron microscope (SEM), electron back-scattered diffraction (EBSD), and transmission electron microscope (TEM).Analyses after welding or long-term service, showed fine NbCs in grains, which will precipitaion strengthen the matrix.When TP347 was long-term serviced in power plants, M23C6 formed preferentially on the grain boundaries and on twin boundaries, which was attributed to the embrittlement and the intergranular corrosion and fracture.The steam side had less recrystallization rate and more oxide compared to the fire side, which is part of the reason for the cracking from steam side to the fire side.And HAZ is more brittle than the matrix, because of α-Fe phase and coarse grains, due to which, cracks tend to initiate in the steam side of HAZ and propagate to the fire side.

关键词： Superheater tube Crack TP347H Microstructural evolution Phase transformation

作者: Chao Fang Yin-sheng He Keunbong Yoo Jine-Sung Jung Keesam Shin

作者单位: School of Nano & Advanced Materials Engineering, Changwon National University,Changwon, 51140, Korea Power Generation Laboratory, Korea Electric Power Research Institute, Daejeon, 34056, Korea

会议类型: 国际会议

会议名称: The 2016 China Functional Materials Technology and Industry Forum (2016中国国际功能材料大会暨第九届中国功能材料及其应用学术会议)

会议地点: 重庆

会议语种:英文

页码: 22-28

在线出版日期: 2016-07-25（万方平台首次上网日期，不代表论文的发表时间）