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首页> 外文期刊>Materials science forum >In Situ EDXRD Study of MAG-Welding Using LTT Weld Filler Materials under Structural Restraint
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In Situ EDXRD Study of MAG-Welding Using LTT Weld Filler Materials under Structural Restraint

机译：在结构约束下使用LTT焊缝填充材料进行MAG焊接的原位EDXRD研究

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摘要

Welding using low transformation temperature (LTT) filler materials is an innovative approach to mitigate detrimental welding residual stresses without cost-intensive post weld-treatments [1,2]. Due to the local generation of compressive residual stresses in the weld line by means of a delayed martensite transformation a significant enhancement of the cold cracking resistance of highly stressed welded components can be expected. For the effective usage of these materials a deeper understanding of the microstructural evolution inside the weld material is necessary to determine the complex processes that cause the residual stress formation during welding. Solid-state phase transformation kinetics and the evolution of strain in LTT weld filler materials are monitored in-situ at the instrument ID15A at the ESRF in Grenoble, France. The transferability to real components is implemented by using a realistic MAG welding process under consideration of structural restraint. During welding of multilayer joints, the phase transformation and phase specific strain evolution of each individual layer is investigated in transmission geometry by means of energy-dispersive X-ray diffraction EDXRD using high energy synchrotron radiation with a counting rate of 2.5 Hz. The measurement results of a 10% Cr /10% Ni LTT weld filler are compared to data monitored for the conventional weld filler material G89. The in-situ data clearly indicate a strong effect on the local strain evolution and the formation of compressive strain. This results from the restraint volume expansion during the postponed austenite to martensite transformation of the LTT weld filler, which counteracts the thermal shrinkage. In contrast, for the conventional weld filler material the thermal contraction strains lead to tensile residual strain during welding. Furthermore, the results of in-situ observation during welding show that the transformation kinetic is dependent on the welding sequence.
机译：使用低转变温度（LTT）填充材料进行焊接是一种创新的方法，可减轻有害的焊接残余应力，而无需进行成本高昂的后期焊接处理[1,2]。由于通过延迟的马氏体转变在焊接线中局部产生压缩残余应力，因此可以预期显着提高高应力焊接部件的抗冷裂性。为了有效地使用这些材料，有必要对焊接材料内部的微观结构演变有更深入的了解，以确定导致焊接过程中形成残余应力的复杂过程。在法国格勒诺布尔的ESRF仪器ID15A上，现场监测LTT焊接填充材料中的固态相变动力学和应变的演变。考虑到结构约束，可以通过使用实际的MAG焊接工艺来实现对真实组件的可传递性。在多层接头的焊接过程中，通过能量散射X射线衍射EDXRD，使用高能量同步加速器辐射，以2.5 Hz的计数率，研究了传输几何中每个单独层的相变和相变应变演化。将10％Cr / 10％Ni LTT焊接填料的测量结果与常规焊接填料G89监测的数据进行比较。现场数据清楚地表明了对局部应变演化和压缩应变形成的强大影响。这是由于LTT焊缝在奥氏体向马氏体的延缓转变过程中的约束体积膨胀所致，从而抵消了热收缩。相反，对于常规的焊接填充材料，热收缩应变导致焊接期间的拉伸残余应变。此外，焊接过程中的现场观察结果表明，转变动力学取决于焊接顺序。

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  • 来源
    《Materials science forum》 |2017年第2017期|107-113|共7页
  • 作者

    Vollert F.; Dixneit J.; Gibmeier J.; Kromm A.; Buslaps Th.; Kannengiesser Th.;

  • 作者单位

    Karlsruhe Institute of Technology (KIT), Institute of Applied Materials (IAM) Kaiserstr.12, 76131 Karlsruhe, Germany;

    BAM Federal Institute for Materials Research and Testing, Unter den Eichen 87, 12205 Berlin, Germany;

    Karlsruhe Institute of Technology (KIT), Institute of Applied Materials (IAM) Kaiserstr.12, 76131 Karlsruhe, Germany;

    BAM Federal Institute for Materials Research and Testing, Unter den Eichen 87, 12205 Berlin, Germany;

    European Synchrotron Radiation Facility, 6 Rue Jules Horrowitz, 38042 Grenoble, France;

    BAM Federal Institute for Materials Research and Testing, Unter den Eichen 87, 12205 Berlin, Germany;

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  • 正文语种 eng
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  • 关键词

    Low Transformation Temperature; Weld Filler; Residual Stress; Welding; High Energy Synchrotron Diffraction;

    机译：转变温度低;焊缝填充剂残余应力;焊接;高能同步加速器衍射;

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