Study in simulated heat-affected zones of steel for wagon
The experiments were carried out upon the determination of SH-CCT diagrams and the characteristics of mierostructures and properties in simulated coarse grain heat-affected zone (CGHAZ) of steels for wagon under different heat input using physical simulation.Mierostructures and properties in simulated HAZ under different peak temperatures were also investigated. The results show that bainite is mainly obtained in a wide heat input range with t8/5 from 3 s to 200 s.When the maximum cooling rate reaches 100 ?/s,the mierostruc tures mainly consist of lath bainite and the hardness is only 248HV,which demonstrate that the steel has a low quench-hardening tenden cy and excellent resistance to cold cracking. The impact energies at -40? reach more than 100 J in simulated CGHAZ under the line en ergies ranging from 10 to 26 kJ/cm for 14 mm thick plate.With higher heat input,formation of ferrites which continuously and reticulate ly distribute on the primary austenite boundary reduces impact toughness. There are no hardening and softening phenomena in simulated CGHAZ.Fine grain HAZ achieves better impact toughness while the impact energy in intercritical HAZ reaches 123 J. The impact energy decreases to 61J owing to severe grain coarsening at 1400 ? (Tp).Hardening and softening phenomena do not occur in simulated HAZ when t8/5 is 30 s.
steel for wagon heat-affected zone heat input peak temperature bainite ferrite
LIU Wenyan CHEN Jiqing YUAN Guilian GONG Tao LIU Jibin
Research and Development Center,Wuhan Iron & Steel (Group) Corp.,Wuhan 430080,China
国际会议
The 10th China-Russia System on Advanced Materials and Technologies(第十届中俄新材料新工艺研讨会)
浙江嘉兴
英文
795-799
2009-10-20（万方平台首次上网日期，不代表论文的发表时间）