| 自保护药芯焊丝熔敷金属中O、N的控制及其对显微组织和韧性的影响 |
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| 引用本文： | 张占伟,李午申,薛振奎,白世武.自保护药芯焊丝熔敷金属中O、N的控制及其对显微组织和韧性的影响[J].天津大学学报(自然科学与工程技术版),2010,43(2). |
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| 作者姓名： | 张占伟 李午申 薛振奎 白世武 |
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| 作者单位： | 张占伟,李午申(天津大学材料科学与工程学院,天津,300072);薛振奎,白世武(中国石油天然气管道科学研究院,廊坊,065001) |
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| 基金项目： | 国家高技术研究发展计划(863计划)资助项目 |
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| 摘 要： | 采用氧氮分析仪、光学显微镜、电子显微镜及电子能谱仪研究了自保护药芯焊丝熔敷金属中O、N含量对夹杂物类型、显微组织及低温冲击韧性的影响规律.结果表明,对于BaF_2-Al-Mg渣系自保护药芯焊丝,药芯中不低于4%的LiF,可有效改善电弧稳定性;同时在电弧区生成Li_3N,降低熔覆金属中的N含量.通过向药芯中加入10%的Fe_2O_3和5%的MnO_2,可将熔敷金属中Al质量分数降低至0.84%,而氧质量分数提高到85×10~(-6),得到以Al_2O_3为主的圆形夹杂,增加晶内异质形核核心,焊缝组织得到细化.通过对O、N含量的有效控制可显著提高熔敷金属的低温韧性.
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| 关 键 词： | 自保护药芯焊丝 夹杂物 韧性 |
Control of O,N and Their Impact on Microstructure and Toughness of Deposited Metal of Self-Shielded Flux Cored Wire |
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| ZHANG Zhan-wei,LI Wu-shen,XUE Zhen-kui,BAI Shi-wu.Control of O,N and Their Impact on Microstructure and Toughness of Deposited Metal of Self-Shielded Flux Cored Wire[J].Journal of Tianjin University(Science and Technology),2010,43(2). |
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| Authors: | ZHANG Zhan-wei LI Wu-shen XUE Zhen-kui BAI Shi-wu |
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| Institution: | ZHANG Zhan-wei1,LI Wu-shen1,XUE Zhen-kui2,BAI Shi-wu2(1.School of Material Science , Engineering,Tianjin University,Tianjin 300072,China,2.Research Institute of China Petroleum Pipeline Bureau,Langfang 065001,China) |
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| Abstract: | The impact of O,N content in deposited metal of self-shielded flux cored wire on the type of inclusions,microstructure and low-temperature impact toughness has been studied with oxygen-nitrogen analyzer,optical microscopy,electron microscopy and electron spectroscopy.The experimental results reveal that in self-shielded flux cored wire of BaF2Al-Mg slag system,LiF addition of no less than 4% of the total flux core can improve arc stability effectively and generate Li3N in the arc zone so that nitrogen conte... |
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| Keywords: | O N self-shielded flux cored wire O N inclusion toughness |
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