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应用科学学报 ›› 2000, Vol. 18 ›› Issue (3): 194-197.

• 论文 • 上一篇    下一篇

药芯焊丝焊缝中的夹杂物对针状铁素体形成的影响规律

余圣甫1, 石仲堃1, 李志远1, 王杰2   

  1. 1. 华中理工大学材料科学与工程学院, 湖北武汉 430074;
    2. 南通商检局, 江苏南通 220062
  • 收稿日期:1999-10-23 修回日期:2000-02-06 出版日期:2000-09-30 发布日期:2000-09-30
  • 作者简介:余圣甫(1962-),男,湖北孝感人,副教授,博士后.

The Effect of the Inclusions in Weld Metals for Flux Cored Wires on the Forming of Acicular Ferrite

YU Sheng-fu1, SHI Zhong-kun1, LI Zhi-yuan1, WANG Jie2   

  1. 1. College of Material Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China;
    2. Nantong IMP. & Exp. Commodity Insp. Bureau of the P. R. C. Nantong 226005, China
  • Received:1999-10-23 Revised:2000-02-06 Online:2000-09-30 Published:2000-09-30

PDF

78

被引次数

33

摘要： 系统研究了药芯焊丝焊缝金属中非金属夹杂物尺寸大小和分布规律,用透射电镜和能谱仪分析了焊缝金属中非金属夹杂物的形状和化学成分.结果表明:药芯焊丝焊缝金属中促进针状铁素体形核长大的非金属夹杂物是Ti、Mn、Si、Al、Cu形成的氧硫复合物.焊缝金属中Ni、Mn、Mo的含量和焊接线能量对非金属夹杂物的尺寸大小及化学成分影响很小.药芯焊丝焊缝金属中针状铁素体的形核长大是由于非金属夹杂物有高能惰性界面,以及非金属夹杂物与母相的线膨胀系数有较大差别,在非金属夹杂物附近造成很大应变能的结果.

关键词: 焊缝金属, 针状铁素体, 药芯焊丝, 非金属夹杂物

Abstract: The sizes of non-metallic inclusions in weld metals for flux cored wires and the rule of their distribution are systematically studied. The chemical composition and the figures of nonmetallic inclusions in weld metals are analyzed with transmission electron microscopy and X-ray microanalysis. The results show that the non-metallic inclusions beneficial to nucleation and growth of acicular ferrite in weld metals are oxidation products of Ti, Mn, Si, Al and the sulphides of Mn and Cu. The percentage of Ni,Mn and Mo in the weld metals and welding energy input have little effect on the chemical composition,sizes and figures of non-metallic inclusions in the weld metals. As nucleation sites, the non-metallic inclusions can reduce the nucleation energy remarkably. Besides they have different thermal expansion coefficients from that of the substrate metals, which will introduce a high stress-stain field around the inclusions during the cooling process. These two factors are the main driving forces to the nucleation and growth of acicular ferrite.

Key words: flux cored wire, weld metal, non-metallic inclusion, acicular ferrite

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