工程科学学报2017，Vol.39Issue(4)：529-534,6.DOI:10.13374/j.issn2095-9389.2017.04.007
回火次数对P91焊管接头力学性能的影响
Influence of tempering times on the mechanical properties of P91 weld joints
摘要
Abstract
The P91 weld joint used in the experiment is re-tempered according to the heat treatment process.The effect of tempering times on its mechanical properties,including that at room temperature and high temperature,was then investigated in relation to the evolution of its microstructure using optical microscopy(OM),X-ray diffraction(XRD),transmission electron microscopy(TEM),selected area electron diffraction(SAED),and tensile tests.Results indicate that the strength at room and high temperature of the heat affected zone increases first and then decreases with an increase in tempering times.In addition,the microstructure is still tempered sorbite that reserves the orientation of lath martensite,and the main phases are the α-Fe phase and Fe-Cr phase.After being tempered once,its high-temperature tensile strength reaches a maximum of 232.66MPa.These improved mechanical properties relate to the dispersed distribution of niobium and vanadium carbonitride precipitate particles,dislocation tangles,and dense metastable dislocation networks.With the increase of tempering times,the distribution of Cr23C6 precipitates gradually undergoes a change from being isolated to displaying a continuous manner in the grain boundaries;this can embrittle the grain boundary and reduce the strength while improving toughness.关键词
无缝管/焊接接头/回火/微观组织/高温力学性能Key words
seamless pipe/weld joints/tempering/microstructure/high temperature mechanical properties分类
矿业与冶金引用本文复制引用
王超,党文静,鲁路,王瑜,崔征,王伟博..回火次数对P91焊管接头力学性能的影响[J].工程科学学报,2017,39(4):529-534,6.基金项目
国家质检总局科技计划资助项目(SNQTS_2013QK148) （SNQTS_2013QK148）
