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铬含量对耐候钢熔敷金属韧性的影响

肖晓明, 彭云, 杨帅, 田志凌

肖晓明, 彭云, 杨帅, 田志凌. 铬含量对耐候钢熔敷金属韧性的影响[J]. 焊接学报, 2014, 35(5): 26-30.
引用本文: 肖晓明, 彭云, 杨帅, 田志凌. 铬含量对耐候钢熔敷金属韧性的影响[J]. 焊接学报, 2014, 35(5): 26-30.
XIAO Xiaoming, PENG Yun, YANG Shuai, TIAN Zhiling. Effect of Cr content on deposited metal toughness of weathering steel[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2014, 35(5): 26-30.
Citation: XIAO Xiaoming, PENG Yun, YANG Shuai, TIAN Zhiling. Effect of Cr content on deposited metal toughness of weathering steel[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2014, 35(5): 26-30.

铬含量对耐候钢熔敷金属韧性的影响

基金项目: 国家重点基础研究发展计划资助项目(973计划,2010CB630800)

Effect of Cr content on deposited metal toughness of weathering steel

  • 摘要: 通过拉伸、冲击试验,利用金相显微镜、透射电镜、扫描电镜和电子背散射衍射技术分析了铬含量对耐候钢熔敷金属组织和韧性的影响.结果表明,两种熔敷金属的组织均为粒状贝氏体、针状铁素体和少量板条贝氏体.两种熔敷金属冲击韧性良好.与含1.0% Cr(质量分数)熔敷金属相比,含1.41% Cr熔敷金属中粒状贝氏体含量升高,针状铁素体含量降低,屈服强度增加6%,抗拉强度增加9%,冲击吸收功降低56%.此外,含1.41%Cr熔敷金属中M-A组元含量升高、大角度晶界比例下降、平均有效晶粒尺寸增加,显微裂纹的形核几率增加,裂纹扩展阻力降低,导致其韧性降低.
    Abstract: The effect of Cr content on microstructure and toughness in deposited metals of weathering steel were investigated by the tensile test,impact test,optical microscope(OM), transmission electron microscopy(TEM),scanning electron microscope(SEM) and electron back-scattered diffraction(EBSD), respectively. The results show that the microstructure consists of granular bainite,acicular ferrite and a few lath bainite for both deposited metals. Good impact toughness is obtained for both deposited metals. Comparing with 1.0% Cr containing deposited metal,the content of granular bainite increases while acicular ferrite decreases of 1.41% Cr containing deposited metal. And the yield strength,tensile strength have improved by 6%,9%, respectively,but the impact toughness has dropped by 56%. The increasing of the content of M-A constituents and mean grain size,and the decreasing of the number of the large angle boundary of 1.41% Cr containing deposited metal,which cause the rising of the probability of the crack initiation and reducing the resistance to crack propagate,result in its worse toughness.
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出版历程
  • 收稿日期:  2012-11-12

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