The effect of thermal aging on tensile property of HR3C steel

摘要：

HR3C (25Cr-20Ni-Nb-N) is a new austenitic steel used as superheat and reheater tubes in Ultra-supercritical Boiler.The purpose of this paper is to research the steels high-temperature mechanical properties and the effects of precipitates after thermal aging by the high temperature short time tensile.The experimental materials were supply state specimens and thermal aging specimens.The experiment temperatures were 650℃ and 750℃.The results showed that the yield strengths of thermal aging HR3C were superior to the supply state specimens.The optical microstructure of thermal aging specimen showed that there were numerous precipitates along the intergranulars and in the intracrystallines.It indicated that these precipitations increased yield strength of the thermal aging specimen.There was an interesting result obtained from the stress-strain curves only considering the temperature influence.The supply state specimen has preferable plasticity at the lower temperature.This abnormal phenomenon was resulted in precipitates along the grain boundaries when this state specimen was tested at higher temperature.

关键词： HR3C High-temperature mechanical properties High temperature short time tensile test Aging

作者: Yuanyuan Fang Xiaona Li Lin Qi Dongming Li Jie Zhao

作者单位: Key Laboratory of Materials Modification by Laser,Ion and Electron Beams,Dalian University of Techno Key Laboratory of Materials Modification by Laser,Ion and Electron Beams,Dalian University of Techno School of Materials Science and Engineering,Dalian University of Technology,Dalian 116024,China

会议类型: 国际会议

会议名称: 国际断裂力学2009年会

会议地点: 成都

会议语种:英文

页码: 343-346

在线出版日期: 2009-10-16（万方平台首次上网日期，不代表论文的发表时间）