Micromechanical Behavior and Collapse Mechanism of Multi-phase Pipeline Steel
The deformation and micro-voids formation mechanisms in F/B multi-phase steel with 47%volume fraction of bainite have been deeply studied by numerical simulation and experimental observation.The results shows that the micro-strain concentrates at the soft/hard phase(F/B)interface in multi-phase steel,which should be related to the mechanism of incompatible deformation.During the necking of the steel,the micro-voids initially form around the F/B interface,then grow and tear in the soft phase.With the severe strain,the microvoids also form in bainite.The density of micro-voids in bainite is higher than that in ferrite,the failure mechanism of bainite is the coalescence of micro-voids,and the failure mechanism of ferrite is micro-voids growth and tearing.Due to the different failure mechanisms of ferrite and bainite,a portion of soft phase would be beneficial to the anti-collapse properties of F/B multi-phase steel during ductile fracture.
F/B multi-phase steel numerical simulation F/B interface micro-strain micro-voids failure mechanism soft phase
Chengjia SHANG Cunjiang TANG Shilong LIU
State Collaborative Innovation Center of Steel Technology,University of Science and Technology Beijing,Beijing,China
国内会议
西安
英文
1-6
2015-04-27（万方平台首次上网日期，不代表论文的发表时间）