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首页> 外文期刊>ISIJ international >Influence of Oxygen Content on Microstructure and Inclusion Characteristics of Bainitic Weld Metals
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Influence of Oxygen Content on Microstructure and Inclusion Characteristics of Bainitic Weld Metals

机译：氧含量对贝氏体焊接金属组织和夹杂特性的影响

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摘要

The effects of non-metallic inclusions on the as-deposited microstructure of fully bainitic weld metals were investigated in a series of gas-metal arc (GMA) welds produced with four different shielding gases to obtain welds with different oxygen contents. Single run GMA bead-in-groove welds were made using ER100S-G grade wire which contained minimal amounts of aluminum and titanium. It was found that the 'oxygen effect,' which is well known in ferritic welds as the maximization of acicular ferrite formation at intermediate oxygen levels of 200-300 ppm and is explained by the shift of CCT curves with oxygen content, took place in the present bainitic welds with the maximum acicular ferrite occurred near 150 ppm oxygen. For a weld containing 150 ppm oxygen, all inclusions were extensively covered with a thin layer of titanium oxide. As the oxygen content decreased to about 100 ppm, a thick sulfide shell surrounded the aluminum oxide core and resulted in a fully bainitic microstructure. On the other hand, for welds containing more than 250 ppm oxygen, less than 50% of inclusions were covered with a titanium-oxide layer, and the coverage rate was substantially lower than for welds of 150 ppm oxygen. This led to a mixed microstructure of acicular ferrite and bainite. Therefore, the oxygen effect in the present welds could be concluded to be not due to the shift of the CCT diagram but to the fact that the inclusion phases vary with oxygen content. A new model based on these facts is suggested.
机译：在一系列由四种不同保护气体产生的气体-金属电弧（GMA）焊缝中，研究了非金属夹杂物对全贝氏体焊缝金属沉积态显微组织的影响，以获得具有不同氧含量的焊缝。使用ER100S-G级焊丝制作的单次GMA槽内焊道焊缝中所含的铝和钛量最少。已经发现，在铁素体焊缝中众所周知的“氧效应”是在中等氧含量为200-300 ppm时针状铁素体形成的最大化，并通过CCT曲线随氧含量的变化来解释。目前最大针状铁素体的贝氏体焊缝发生在150 ppm的氧气附近。对于含氧量为150 ppm的焊缝，所有夹杂物均覆盖有一层薄薄的氧化钛。当氧含量降低到约100 ppm时，厚的硫化物壳包围了氧化铝核，并导致了完全的贝氏体微观结构。另一方面，对于含氧量超过250 ppm的焊缝，少于50％的夹杂物被氧化钛层覆盖，其覆盖率明显低于含氧量为150 ppm的焊缝。这导致了针状铁素体和贝氏体的混合微观结构。因此，可以得出结论，当前焊缝中的氧气效应不是由于CCT图的偏移，而是由于夹杂物相随氧气含量而变化的事实。建议基于这些事实的新模型。

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  • 来源
    《ISIJ international》 |2013年第2期|279-285|共7页
  • 作者

    Jun Seok SEO; Changhee LEE; Hee Jin KIM;

  • 作者单位

    Department of Advanced Materials & Chemical Engineering, Hanyang University, 17 Haengdang-dong, Seongdong-gu, Seoul, 133-791 Republic of Korea;

    Division of Materials Science and Engineering, Hanyang University, 17 Haengdang- dong, Seongdong-gu, Seoul, 133-791 Republic of Korea;

    Korea Institute of Industrial Technology, 35-3 Hongchonri, Ibjangmyun, Chonansi, 331-825 Republic of Korea;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    acicular ferrite; oxygen effect; non-metallic inclusion; inclusion phase; CCT diagram;

    机译：针状铁素体氧气作用非金属夹杂物;包容阶段CCT图;

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