【摘要】 通过TMCP工艺实验,研究了终轧温度和卷取温度对低碳锰钢力学性能和微观组织的影响规律。结果表明,在形变诱导相变上限温度Ad3之上(850℃)终轧后快速冷却,组织主要由仿晶界型铁素体(GBA)和大量贝氏体组成,其中贝氏体铁素体呈板条状,塑性和韧性较高;当终轧温度降低到800℃(低于Ad3)时,得到的组织为等轴状铁素体和一定量的贝氏体,等轴铁素体的平均晶粒尺寸约为8μm,强度较高,综合性能良好。终轧温度和卷取温度主要是通过改变实验钢的组织组成和晶粒大小来对其力学性能产生影响的。通过控制终轧温度和卷取温度,可以实现细晶强化、贝氏体相变强化和析出强化的复合强化,有利于低碳锰钢获得良好的综合性能。更多还原

【Abstract】 The effects of processing parameters of TMCP,such as finish rolling temperature and coiling temperature on microstructure and mechanical properties of low C-Mn steel were studied by TMCP tests.The results show that microstructures of strip,rapid cooled after finish rolling at a temperature higher than upper limited temperature of deformation induced ferrite transformation Ad₃,is of grain boundary allotriomorphic ferrite/bainite（GBA/B） and the lath-shaped bainitic ferrite with good elongation and toughness.The microstructure mainly is of equiaxed ferrite about 8 μm in size with good strength and integrated performance and a certain amount of bainite when the finish rolling temperature was decreased to 800 ℃（lower than Ad₃）.Finish rolling temperature and coiling temperature plays an important role in controlling microstructure and grain size for mechanical properties.The compound-strengthening mechanism including grain refining,bainite transformation and carbide precipitation strengthening could be achieved by reasonable combination of the processing parameters such as finish rolling temperature and coiling temperature for good integrated performance.更多还原