Precipitation Behavior and Its Strengthening Effect of X100 Pipeline Steel  

作　　者：NIU Tao KANG Yong-lin GU Hong-wei YIN Yu-qun QIAO Ming-liang 

机构地区：[1]School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China [2]State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China [3]Nanjing Iron and Steel Co Ltd, Nanjing 210035, Jiangsu, China

出　　处：《Journal of Iron and Steel Research International》2010年第11期73-78,共6页

摘　　要：Using TEM （transmisson electron microscopy）, electron diffraction, EDX （energy dispersive X-ray） analysis and physicochemical phase analysis, the morphology, crystal structure, size distribution and chemical composition of precipitates in the microstructure of high strength Nb-microalloyed Xl00 pipeline steel were investigated, and the strengthening effect of precipitation was quantitatively calculated with Ashhy-Orowan correction model. The precipitates obtained in X100 pipeline steel can be divided into two kinds： ＂complex＂ and ＂single＂ particles by morphology. The EDX analysis of ＂single＂ precipitates reveals that the chemical composition matches well with particle dimensions, especially the Nb to Ti ratio regularly decreases with the increase of particle size. The yield strength increments in the way of precipitation strengthening of X100 pipeline steel reached about 52 MPa, suggesting that the precipitation strengthening is not the dominative strengthening mechanism for X100 pipeline steel.Using TEM （transmisson electron microscopy）, electron diffraction, EDX （energy dispersive X-ray） analysis and physicochemical phase analysis, the morphology, crystal structure, size distribution and chemical composition of precipitates in the microstructure of high strength Nb-microalloyed Xl00 pipeline steel were investigated, and the strengthening effect of precipitation was quantitatively calculated with Ashhy-Orowan correction model. The precipitates obtained in X100 pipeline steel can be divided into two kinds： ＂complex＂ and ＂single＂ particles by morphology. The EDX analysis of ＂single＂ precipitates reveals that the chemical composition matches well with particle dimensions, especially the Nb to Ti ratio regularly decreases with the increase of particle size. The yield strength increments in the way of precipitation strengthening of X100 pipeline steel reached about 52 MPa, suggesting that the precipitation strengthening is not the dominative strengthening mechanism for X100 pipeline steel.

关 键 词：X100 pipeline steel CARBONITRIDE precipitation behavior strengthening effect 

分 类 号：TG142.31[一般工业技术—材料科学与工程] TE973[金属学及工艺—金属材料]