Effect of Co Content on Room Temperature Mechanical Properties of CB2 Steel
Author of the article:BAI Yujie;ZHENG Kang;LIU Yue
Author's Workplace：School of Materials Science and Engineering,Northeastern University,Shenyang110819,China
Key Words：CB2 steel Co content mechanical properties heat resistant steel
Abstract：
The effect of 1.0%,3.0%and 6.0%Co content on the mechanical properties of CB2 steel at room temperature,such as tensile strength and brinell hardness,was studied by means of scanning electron microscope,X-ray diffractometer and Thermo-Calc thermodynamic analysis software.The results show that with the increase of Co content,the tensile strength and yield strength of CB2 steel increase,and the reduction rate of section increases first and then decreases.When the Co content is3.0%,the total martensite structure of CB2 steel can be obtained,and the average size of the precipitated phase in the matrix is the minimum.When Co content is 3%,the effect of refining M23C6 phase size is the best,which enhances the precipitation strengthening effect.The tensile strength of CB2 steel is 840 MPa,yield strength is 646 MPa,the section shrinkage rate is58.4%,and the hardness is 271 HB.
