Influences of High-temperature Short-time Endurance Performance of Heat Resistant Steel for Ultra Supercritical Units
Heat-resistant steel(12%wt.Cr) used in the ultra supercritical set blade was quenched and tempered by vacuum heat treatment furnace,the mechanical properties and metallographic structures at room temperature can meet the specific requirements.However,there are some problems existed on high-temperature short-time lasting performance.To improve the high temperature endurance performance of materials,the experimental testing and analysis were carried out fro different types of specimen.The research showed that short-time rupture is a kind of creep fracture,and short lasting strength was closely related to test temperatures between laths and grain boundary and carbide coarsening.Energy spectrum analysis revealed that cast in the hole had high B element content(19.98%wt.),which meant grain boundaries of the B at high temperature began to migrate and form in the crystal B in that second phase particles are contained,and grain boundary strength was obviously decreased.The enduring high temperature experiment indicated that the strength were declined rapidly and fractured suddenly at high temperature.
Short-time endurance performance Heat-resistant steel Carbides coarsening Crack
Hua Tang Feng Xiao Jiansheng Ding Zhihong Li
Sichuan Engineering Technical College, Sichuan Deyang, China
国际会议
the Chinese Materials Congress 2012(2012年中国材料大会(CMC2012))
太原
英文
361-365
2012-07-13（万方平台首次上网日期，不代表论文的发表时间）