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设计了一种C-Si-Mn系(0.14C-1.4Si-2.72Mn)实验钢.采用热膨胀仪测定并研究了实验钢的CCT曲线和相变规律;通过OM、SEM、TEM、EBSD分析了经热轧、退火后钢板的微观组织、相分布等;用XRD测定了实验钢中的残余奥氏体含量.结果表明:0.14C-1.4Si-2.72 Mn实验钢具有较好的淬透性,临界冷速为10.00℃/s;退火后微观组织主要由马氏体、铁素体和少量残余奥氏体组成,其中部分马氏体发生回火,残余奥氏体主要以薄膜状分布在马氏体板条间,部分分布在铁素体晶粒内部,含量为4%~6%;退火后钢板的抗拉强度可达1333MPa,总伸长率为13%,强度和塑性匹配较好.
A C-Si-Mn (0.14C-1.4Si-2.72Mn) experimental steel was designed.The CCT curve and phase transformation of the experimental steel were measured and investigated by thermal dilatometer. The OMT, SEM, TEM and EBSD The microstructure and phase distribution of the steel after hot rolling and annealing were analyzed by XRD.The results showed that the experimental austenite 0.14C-1.4Si-2.72 Mn had better hardenability, The critical cooling rate is 10.00 ℃ / s. The microstructure after annealing mainly consists of martensite, ferrite and a small amount of retained austenite. Some of the martensite is tempered and the residual austenite is mainly distributed in the form of film The ferrite grains are partially distributed in the interior of the ferrite grains with a content of 4% -6%. The tensile strength of the annealed steel plate can reach 1333 MPa with a total elongation of 13%, and the strength and the plasticity match well.