MICROMECHANICAL BEHAVIORS OF MULTI-PHASE HIGH PERFORMANCE STEELS
Microstress and microstrain distributions of ferrite/bainite(F/B)multi-phase steels with different volume fractions of bainite(VB)were studied by SHA model(stacked hexagonal array model).The results show that distributions of microstress and microstrain in F/B multi-phase steels(X70~X100 grade pipeline steels)are heterogeneous and micromechanical mechanisms have been discussed.In general,microstress in bainite is obviously higher than that in ferrite,and microsrtain in ferrite is higher than that in bainite.Second phase close-packed may cause strain concentration,which will obviously affect the failure behaviors of F/B multi-phase steels.Under longitudinal tension,strain concentration will occur in ferrite when bainite is close-packed in longitudinal direction,but it has little effect on ferrite strain concentration when bainite is close-packed in transverse direction.Meanwhile,bainite close-packed will increase the strain around F/B interface,and microcracks/microvoids easily occur around F/B interface,which is harmful to the plasticity of F/B multi-phase steels.However,ferrite close-packed has little effect on the plasticity of F/B multi-phase steels.Homogeneous distribution of bainite in F/B multi-phase steels is beneficial to its plasticity.
F/B multi-phase steels stacked hexagonal array model(SHA model) microstress microstrain close-packed
Cunjiang Tang Chengjia Shang Xuemin Wang Dianxiu Xia
School of Materials Science and Engineering,University of Science and Technology Beijing 30 Xueyuan School of Materials Science and Engineering,University of Science and Technology Beijing 30 Xueyuan
国际会议
Energy Materials 2014(第一届能源材料国际会议)
西安
英文
729-736
2014-11-04（万方平台首次上网日期，不代表论文的发表时间）