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为了研究Mn和Si元素对中锰热轧高强钢显微组织和力学性能的影响,设计了不同Mn、Si含量C-Si-Mn系试验用钢.利用热膨胀仪、扫描电镜、透射电镜、X射线衍射和单向拉伸等实验方法对试验用钢的相变点、显微组织、残余奥氏体含量和力学性能进行了测定与分析.结果表明:Mn和Si对中锰热轧高强钢的显微组织影响较大,对于低Si高Mn的试验钢,其显微组织主要由粒状贝氏体组成;对于高Si高Mn的试验钢,主要由贝氏体铁素体、马氏体和残余奥氏体组成;对于高Si低Mn的试验钢,则由块状铁素体、贝氏体、马氏体和残余奥氏体组成.高Si高Mn试验钢获得最高的综合力学性能,抗拉强度达1200 MPa以上,总伸长率为16%,强塑积接近20 GPa·%.分析认为,试验钢这种高强度和较高的塑性是由超细晶组织和TRIP效应共同决定的.
In order to study the effect of Mn and Si elements on the microstructure and mechanical properties of high-manganese steel, the C-Si-Mn steel with different Mn and Si contents was designed and characterized by means of dilatometer, scanning electron microscope, transmission electron microscope, X Ray diffraction and uniaxial stretching were used to measure and analyze the phase transformation point, microstructure, residual austenite content and mechanical properties of the steel under test.The results show that Mn and Si have good effect on the hot rolling of high manganese steel Of the microstructure has a greater impact on the low Si high Mn test steel, the microstructure mainly composed of granular bainite; for high Si and high Mn test steel, mainly composed of bainitic ferrite, martensite And retained austenite.For high Si and low Mn test steels, it is composed of massive ferrite, bainite, martensite and retained austenite.High Si and high Mn test steels have the highest comprehensive mechanical properties , Tensile strength of 1200 MPa or more, the total elongation of 16%, strong plastic product close to 20 GPa ·%. Analysis, the test steel high strength and high plasticity by the ultrafine grain structure and TRIP effect decided.