Influence Analysis of Microstructure Morphology on Properties of X80 Pipeline Steel

摘要：

By comparing three steels with approximated components, the effect of microstructure morphology on mechanical properties of API 5L-X80 pipeline steel was investigated by metallurgical microscope, scanning electron microscope (SEM) and EBSD system. It was showed that the final microstructure is partially influenced by micro-alloys Nb, V, Ti. With the contents of acicular ferrite(AF), polygonal ferrite(PF) decrease, granular bainite(GB) increases, which with a larger size of the ferrite matrix and substructure, the effective grain size increases, the ratio of large-angle grain boundaries decreases. The percentage of M/A islands is over 5％, the shear area of DWTT(drop weight tear testing) is lower about 60％ at -21℃, While the percentage decreased to about 2％, DWTT shear area increases to above 80％.When the content of residual austenite increases, the ductility of the experimental steel is enhanced. As GB increasing in microstructure, Yield Ratio of the experimental steel is lower.

关键词： microstructure acicular ferrite ferrite grain boundaries

作者: ZHOU Min DU Lin-xiu YI Hai-long LIU Xiang-hua

作者单位: State Key Lab of Rolling Technology and Automation,Northeastern University,Shenyang Liaoning 110004 China

会议类型: 国际会议

会议名称: The Fourth Asian Conference on Heat Treatment and Surface Engineering(第四届亚洲热处理及表面工程大会)

会议地点: 北京

会议语种:英文

页码: 84-89

在线出版日期: 2009-10-27（万方平台首次上网日期，不代表论文的发表时间）