THE EFFECT OF GRAIN SIZE ON FATIGUE CRACK INITIATION IN PIPELINE STEELS

摘要：

The fatigue crack initiation was studied in both ultrafine-grained (UFG) and coarser-grained (CG) pipeline steels under three point bending (3PB) fatigue test at stress ratio, R, of 0.1. Emphasis was placed on investigating the crack initiation life and site of the UFG and CG steels. The UFG materials investigated possess a higher resistance to crack initiation. This was explained by the fact that the microhardness value of ferrite phases in UFG materials has been enhanced compared with that of ferrite phases in CG materials. This was also attributed to the lower value of incompatible internal stress between the ferrite phase and the pearlite phase. An attempt was made to provide information about the improvement of fatigue life for further application of these steels to various industries.

作者: B. Chen S. J. Wu

作者单位: School of Materials Science and Engineering, Beijing University of Aeronautics and Astronautics, No.37 Xueyuan Road,Haidian District, Beijing, 100083, P.R. China.

会议类型: 国际会议

会议名称: 第九届工程结构完整性国际会议(The Ninth International Conference on Engineering Structural Integrity Assessment)

会议地点: 北京

会议语种:英文

在线出版日期: 2007-10-15（万方平台首次上网日期，不代表论文的发表时间）