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贾坤宁, 高彩茹, 杜林秀, 王国栋. 微钙钢中第二相粒子对焊接CGHAZ奥氏体晶粒度及强韧度的影响[J]. 焊接学报, 2007, (3): 73-76.
引用本文: 贾坤宁, 高彩茹, 杜林秀, 王国栋. 微钙钢中第二相粒子对焊接CGHAZ奥氏体晶粒度及强韧度的影响[J]. 焊接学报, 2007, (3): 73-76.
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JIA Kunning, GAO Cairu, DO Linxiu, WANG Guodong. Effect of second phase particles on γ grain size and toughness and strength of CGHAZ in micro-calcium steel[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2007, (3): 73-76.
Citation: JIA Kunning, GAO Cairu, DO Linxiu, WANG Guodong. Effect of second phase particles on γ grain size and toughness and strength of CGHAZ in micro-calcium steel[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2007, (3): 73-76.
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微钙钢中第二相粒子对焊接CGHAZ奥氏体晶粒度及强韧度的影响

Effect of second phase particles on γ grain size and toughness and strength of CGHAZ in micro-calcium steel

    摘要
  • 摘要: 通过向碳素钢中添加微量钙元素,在钢中形成弥散的热稳定的第二相含钙的氧化物粒子。利用扫描电镜、光学电镜、系列冲击试验和显微硬度测试等检测方法,对微钙钢焊接粗晶热影响区(CGHAZ)组织、奥氏体晶粒度及强韧度进行了研究。结果表明,弥散分布的含钙的氧化物粒子,钉扎了焊接热循环过程中CGHAZ的奥氏体晶界迁移,限制了奥氏体晶粒的长大,获得较细的焊接CGHAZ晶粒度,进而改善了微钙钢焊接CGHAZ的强韧度。

     

    Abstract: The thermal-stable particles of oxide containing Ca can be formed in micro-calcium steel which can be obtained by appending Si-Ca powder into carbon steel.The microstructure, γgrain size, strength and toughness of coarse grain heat affected zone(CGHAZ) in micro-calcium and no micro-calcium steels were studied by SEM, microscope, tensile test and series impact experimental.The research show that the second phase particles have strong pinning force to γgrain boundary of CGHAZ in micro-calcium steel.It can retard γgrain growth in the course of welding, and fine γgrain in the CGHAZ, and improve the strength and toughness of CGHAZ in micro-calcium steel.

     

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