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首页> 外文期刊>Materials Science and Engineering >A comparative study of the microstructure and properties of 800 MPa microalloyed C-Mn steel welded joints by laser and gas metal arc welding
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A comparative study of the microstructure and properties of 800 MPa microalloyed C-Mn steel welded joints by laser and gas metal arc welding

机译：激光和气体保护金属电弧焊800 MPa微合金C-Mn钢焊接接头组织和性能的比较研究

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摘要

The differences in microstructure and mechanical properties of laser beam welded (LBW) and gas metal arc welded (GMAW) joints of 800 MPa grade Nb-Ti-Mo microalloyed C-Mn steel of 5 mm thickness were studied. The study suggested that the microstructure in welded seam (WS) of GMAW was acicular ferrite and fine grained ferrite, whereas lath martensite (LM) was obtained in WS of LBW, where inclusions were finer and did not act as nucleation sites for acicular ferrite. The microstructure of coarse-grained HAZ (CGHAZ) obtained using the two welding methods was LM and granular bainite (GB), respectively. The original austenite grain size in CGHAZ of LBW was 1/3 of GMAW. The microstructure of fine-grained HAZ and mixed-grained HAZ using the two welding methods was ferrite and M-A constituents, while that of LBW was significantly fine. The hardness of LBW welded joints was higher than the base metal (BM), which was the initiation site for tensile fracture. The tensile fracture location of GMAW welded joints was in WS. The impact toughness of LBW welded joints was excellent and the impact absorption energy was similar to BM.
机译：研究了厚度为5 mm的800 MPa级Nb-Ti-Mo微合金化C-Mn钢的激光束焊接（LBW）和气体金属电弧焊（GMAW）接头的组织和力学性能差异。研究表明，GMAW焊缝（WS）的显微组织为针状铁素体和细晶粒铁素体，而LBW的WS中获得了板条马氏体（LM），其中夹杂物更细且不充当针状铁素体的成核位点。两种焊接方法得到的粗晶粒热影响区（CGHAZ）的显微组织分别为LM和颗粒贝氏体（GB）。 LBW的CGHAZ中的原始奥氏体晶粒尺寸为GMAW的1/3。使用两种焊接方法的细晶粒热影响区和混合晶粒热影响区的显微组织是铁素体和M-A成分，而LBW的显微组织明显。 LBW焊接接头的硬度高于贱金属（BM），后者是拉伸断裂的起点。 GMAW焊接接头的拉伸断裂位置在WS中。 LBW焊接接头的冲击韧性极好，冲击吸收能与BM相似。

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  • 来源
    《Materials Science and Engineering》 |2016年第4期|150-158|共9页
  • 作者

    Qian Sun; Hong-Shuang Di; Jun-Chen Li; Bao-Qiang Wu; R.D.K. Misra;

  • 作者单位

    The State Key Laboratory of Rolling and Automation of Northeastern University, Shenyang 110819, PR China;

    The State Key Laboratory of Rolling and Automation of Northeastern University, Shenyang 110819, PR China;

    The State Key Laboratory of Rolling and Automation of Northeastern University, Shenyang 110819, PR China;

    National Key Laboratory for Precision Hot Processing of Metals, Harbin Institute of Technology, Harbin 150001, PR China;

    Laboratory for Excellence in Advanced Steel Research, Department of Metallurgical, Material and Biomedical Engineering, University of Texas at El Paso, TX 79968, USA;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Laser welding; Gas metal arc welding; Welding process; Microstructure; Mechanical properties; Impact toughness;

    机译：激光焊接;气体金属电弧焊;焊接工艺;微观结构机械性能冲击韧性;

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