变形工艺对热轧双相钢显微组织和性能的影响

以热轧双相钢为研究对象,在实验室通过热轧实验,研究了变形量、卷取温度、终轧温度对高强热轧双相钢组织细化和力学性能的影响.通过研究可以发现,变形工艺参数对热轧双相钢的显微组织和力学性能有很大的影响,热轧双相钢的显微组织主要有三种典型微观形貌,而这三种典型形貌又赋予了双相钢不同的强韧化机制和力学性能.在实验室条件下,开发了780 MPa级以Mn,Si为主要添加元素的热轧双相钢生产工艺,可以使热轧双相钢的屈服强度达到要求的级别,并且断后伸长率良好.

Deformation Effect on Microstructure and Mechanical Properties of Hot-Rolled Dual-Phase Steel

The effects of reduction,coiling temperature and finish rolling temperature on the refinement of microstructure and mechanical properties of hot-rolled dualphase steel were investigated in lab.It was found that the deformation process parameters affect greatly the microstructure and mechanical properties and there are three typical microstructural morphologies,which cause the hot-rolled dual-phase steel in different toughening mechanism and mechanical properties.The tensile strength of the steel developed in the lab by controlling the process parameters with Mn and Si as main alloying elements comes up to the Grade 780MPa with high percentage elongation.