【作者】 赵征志； 闫远； 尹鸿祥； 丁然； 郗洪雷； 梁江涛；

【Author】 ZHAO Zhengzhi;YAN Yuan;YIN Hongxiang;DING Ran;XI Honglei;LIANG Jiangtao;Engineering Research Institute,University of Science and Technology Beijing;Beijing Engineering Technology Research Center of Special Steel for Traffic and Energy;

【机构】 北京科技大学冶金工程研究院； 北京市交通与能源用特殊钢工程技术研究中心；

【摘要】 为了获得Mn含量介于中锰和低锰之间的具有优良性能的低碳低硅钢,设计了本试验钢。利用DIL 805A型热膨胀仪测定了试验钢的A_c1、A_c3及M_s、M_f点。使用拉伸试验机测定了试验钢的力学性能,通过SEM、EBSD及XRD等技术观察了试验钢的组织结构及残余奥氏体量。结果表明,随着退火温度的提高,试验钢的抗拉强度及屈服强度不断升高;伸长率不断降低;残余奥氏体量先下降后保持在4.5%左右。760℃退火后,试验钢获得最佳力学性能,其屈服强度为631 MPa,抗拉强度为1173 MPa,伸长率为10.1%。通过试验钢可以发现,当退火温度低于A_c3时,随着退火温度的提高,试验钢的屈服强度与抗拉强度显著升高,伸长率随之下降,这主要是由于淬火后马氏体比例不断增加。更多还原

【Abstract】 In order to obtain a low carbon and low silicon steel with chemical composition of Mn between low Mn and medium Mn,that has the excellent properties,the tested steel was designed.The temperature of A_c1,A_c3,M₅ and M_f were tested by use of DIL805 A dilatometer.Uniaxial tensile properties of the annealed steel sheet were obtained by tensile test machine,the microstructure of the tested steel was revealed through technology of SEM,EBSD and XRD.The results show,with annealing temperature increasing,tensile strength and yield strength both increase,while,total elongation decrease and the volume fraction of retained austenite is almost 5%always.The ultimate tensile strength of 1173 MPa,whose yield strength is 631 MPa,and the total elongation of 10%are obtained for the steel annealed at 760 ℃.Raise the annealing temperature can significantly improve the yield strength and tensile strength,while the elongation decreases,which is mainly due to the increasing proportion of martensite.更多还原