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Co含量对CB2耐热钢室温力学性能的影响
Effect of Co Content on Room Temperature Mechanical Properties of CB2 Steel
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- DOI:
- 作者:
- 白玉洁 郑康 刘越
BAI Yujie;ZHENG Kang;LIU Yue
- 作者单位:
- 东北大学材料科学与工程学院
School of Materials Science and Engineering,Northeastern University,Shenyang110819,China
- 关键词:
- CB2钢 CO含量 力学性能 耐热钢
CB2 steel Co content mechanical properties heat resistant steel
- 摘要:
- 为研究Co含量对CB2钢室温力学性能的影响,调整CB2钢中Co元素的含量分别为1.0%、3.0%和6.0%。利用室温拉伸和布氏硬度观察Co含量对CB2钢室温力学性能的影响规律,采用扫描电子显微镜、X射线衍射仪和Thermo-Calc热力学分析软件等分析手段,研究Co含量对CB2钢室温力学性能的影响机制。研究发现:随着Co含量的增加,CB2钢的抗拉强度和屈服强度均增加,断面收缩率呈先增加后降低的趋势。当Co含量为3.0%时,能够使CB2钢获得全马氏体组织,同时基体中析出相的平均尺寸最小;当Co含量为3%时,其细化M23C_6相的尺寸的效果最好,增强了析出强化效果,CB2钢抗拉强度为840 MPa,屈服强度为646 MPa,断面收缩率为58.4%,硬度为271 HB。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.