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Characterizations of 21-4N to 4Cr9Si2 stainless steel dissimilar joint bonded by electric-resistance-heat-aided friction welding

机译:电阻-热辅助摩擦焊接的21-4N至4Cr9Si2不锈钢异种接头的表征

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摘要

A new welding process, electric-resistance-heat-aided friction welding (ERHAFW), was introduced in this study. To further improve the joint quality and energy-saving, electric resistance welding was combined with the conventional continuous-drive friction welding. 21-4N (austenitic stainless steel) and 4Cr9Si2 (martensitic stainless steel) valve steel rods of 4 mm diameter were used as base metals. The results show that electric-resistance-heat-aided friction welding can be applied to join thin rods within a relatively short time, which is very difficult for conventional friction welding (FW). The microstructure of ERHAFW bonded 21-4N to 4Cr9Si2 presents non-uniform across the joint. Different structure zones are observed from the weld line to both sides, which are the weld center, thermo-mechanically affected zone (TMAZ) and heat affected zone (HAZ). These regions exhibit different structures owing to the difference in the thermophysical and mechanical properties of these two steels under the fast heating and cooling during welding. The variation of microhardness in the joint is attributed to the microstructure change. The higher microhardness is obtained in the weld center and TMAZ of 4Cr9Si2 corresponding to the presence of fine tempered martensite and carbides.
机译:这项研究引入了一种新的焊接工艺,即电阻热辅助摩擦焊接(ERHAFW)。为了进一步提高接头质量和节能效果,电阻焊与传统的连续驱动摩擦焊相结合。直径为4 mm的21-4N(奥氏体不锈钢)和4Cr9Si2(马氏体不锈钢)阀钢棒用作贱金属。结果表明,电阻热辅助摩擦焊接可以在相对短的时间内应用于细棒的连接,这对于传统的摩擦焊接(FW)来说是非常困难的。 ERHAFW键合的21-4N与4Cr9Si2的微观结构在接头上呈现出不均匀的现象。从焊接线到两侧观察到不同的结构区域,即焊接中心,热机械影响区(TMAZ)和热影响区(HAZ)。由于在焊接过程中这两种钢在快速加热和冷却下的热物理和机械性能不同,这些区域表现出不同的结构。接头中显微硬度的变化归因于显微组织的变化。在4Cr9Si2的焊缝中心和TMAZ中获得较高的显微硬度,这对应于细回火马氏体和碳化物的存在。

著录项

  • 来源
    《Materials & design》 |2009年第10期|4230-4235|共6页
  • 作者单位

    Shaawd Key Laboratory of Friction Welding Technologies, Northwestern Polytechnical University, Xi'an 710072, Shaawd, PR China;

    Shaawd Key Laboratory of Friction Welding Technologies, Northwestern Polytechnical University, Xi'an 710072, Shaawd, PR China;

    Shaawd Key Laboratory of Friction Welding Technologies, Northwestern Polytechnical University, Xi'an 710072, Shaawd, PR China;

    School of Materials Science and Engineering, Xi'an Jiaoting University, Xi'an 710049, Shaawd, PR China;

    School of Materials Science and Engineering, Xi'an Jiaoting University, Xi'an 710049, Shaawd, PR China;

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

    electric-resistance-heat-aided friction welding; stainless steel; secondary friction surface; microstructure; microhardness;

    机译:电阻热辅助摩擦焊接;不锈钢;二次摩擦面微观结构显微硬度;

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