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Microstructure characteristics and fatigue properties of welded HSLA with and without buffer layer

机译:带和不带缓冲层的焊接HSLA的组织和疲劳性能

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摘要

The microstructure variation and its subsequent influence on the fatigue behavior and Vickers hardness of an extensively weld-repaired high strength low alloy (HSLA) were investigated in this study. Microstruc-tures of the as-received HSLA, or parent metal (PM), welded HSLA without buffer layer (BL), and welded HSLA with 4 or 10 mm BL between the PM and weld metal (WM) were examined and compared with the corresponding fatigue behavior, hardness measurement, and fatigue-fractured surface. It was found that the fatigue resistance and hardness in part of the WM and in the melted parent metal (MPM) during welding of the welded HSLA without BL were lower than those of PM. However, the welded HSLA with a 4-mm-BL produced a marked increase in fatigue resistance and hardness, especially within the WM, within the mixed area of BLand MPM (BL+MPM). This was because the WM and MPM of welded HSLA without BL had block ferrite and coarse columnar grain structures. Furthermore, no obvious differences were found in fatigue property, hardness and microstructure between the MPM of welded HSLA without BL and the BL + MPM of welded HSLA with 10-mm-BL In addition, optical microscopy and SEM examinations of the corresponding regions revealed that block ferrite and non-metallic particles were the main reason of poor fatigue resistance and low hardness.
机译:本研究研究了广泛焊接修复的高强度低合金(HSLA)的组织变化及其对疲劳行为和维氏硬度的影响。检查了原样的HSLA或母材(PM),不带缓冲层(BL)的焊接HSLA以及PM与焊缝金属(WM)之间具有4或10 mm BL的焊接HSLA的微观结构,并将其与相应的疲劳行为,硬度测量和疲劳断裂表面。发现在没有BL的HSLA焊接过程中,部分WM和熔融母材(MPM)的抗疲劳性和硬度低于PM。但是,在BLand MPM(BL + MPM)的混合区域内,焊缝为4-mm-BL的HSLA的抗疲劳性和硬度显着提高,尤其是在WM中。这是因为没有BL的HSLA焊接的WM和MPM具有块状铁素体和粗大的柱状晶粒结构。此外,无BL的HSLA焊接的MPM与10mm-BL的HSLA的BL + MPM之间的疲劳性能,硬度和微观结构没有明显差异。此外,对相应区域的光学显微镜和SEM检查表明:块状铁素体和非金属颗粒是抗疲劳性差和硬度低的主要原因。

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  • 来源
    《Materials Science and Engineering》 |2012年第1期|p.169-179|共11页
  • 作者单位

    Key Laboratory of Road Construction Technology and Equipment, MOE, Chang'an University, Xi'an 710064, PR China,School of Mechanical and Chemical Engineering, The University of Western Australia, Perth 6009, Australia;

    School of Mechanical and Chemical Engineering, The University of Western Australia, Perth 6009, Australia,School of Materials Science and Technology, China University of Geosciences (Beijing), Beijing 100083, PR China;

    School of Mechanical and Chemical Engineering, The University of Western Australia, Perth 6009, Australia;

    Key Laboratory of Road Construction Technology and Equipment, MOE, Chang'an University, Xi'an 710064, PR China,School of Construction Machinery, Chang'an Univer sity, Nan Er Huan Zhong Duan, Xi'an 710064, PR China;

    Key Laboratory of Road Construction Technology and Equipment, MOE, Chang'an University, Xi'an 710064, PR China;

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

    mechanical characterization; microanalysis; welding; fatigue; fracture; phase transformation;

    机译:机械特性微量分析焊接;疲劳;断裂;相变;

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