X100管线钢的热轧显微组织分析.pdf

45 9 Vol. 45, No. 9 2 0 1 0 9 Iron and Steel September 2010 X100 1, 2 1 1 周 平 , 兰亮云 , 邱春林 , 2 1 1 霍孝新 , 高秀华 , 刘相华 ( 1. , 110004; 2. , 271104) : , ,T EM E SD :G + AF ,AF ;, ,, , ; 88% ,30~ 60, : X100; ; ; : TG 142. 1 : A : 0449749X(2010 HotRolled Microstructure Analysis of X100 Pipeline Steel 1, 2 1 1 ZHOU Ping , LAN Liangyun , QIU Chunlin , 2 1 1 HUO Xiaoxin , GAO Xiuhua , LIU Xianghua ( 1. The State Key Lab of Rolling and Automation, Northeastern University, Shenyang 110004, Liaoning, China; 2. T echnical Research and Development Center, Laiw u Steel Group, Laiwu 271104, Shandong, China) Abstract: The relationship between microstructure and mechanical properties w ere investigated through hotrolling tests, scanning electron microscopy, TEM observation and analysis of E SD technology. T he results show that G + AF are the primary microstructures, and AF is typical of long needlelike structure. the quasi polygonal ferrite transformed from massive ferrite is the main structure, containing a lot of interior dislocation and further forming the high dislocation density of dislocations cell, and distributing small precipitates in dislocation lines w ith high strength and good impact toughness. The w ideangle grain boundary is about 88% of the total grain boundary ob served, wideangle grain boundary are mainly distributed i