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首页> 外文期刊>International journal of structural integrity >Estimation of local properties in welded joints using samples with simulated microstructure
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Estimation of local properties in welded joints using samples with simulated microstructure

机译：使用模拟微观结构的样品估算焊接接头的局部性能

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Purpose - The purpose of this paper is to determine local properties in a coarse grain zone of 10 mm thick butt welded joints made of structural S355 and high strength S960 steels. Metallographic analyses showed that the width of the investigated zone for both S355 and S960 weldments was too small for direct sampling. Therefore, samples with reproduced microstructure were manufactured by heat treatment taking into account chemical composition and cooling conditions of weldments. Design/methodology/approach - The basis for the heat treatment was the time-temperature-transition (TTT) curve, whose shape is defined by welding and cooling parameters. In this study the TTT curve was determined experimentally during welding as well as numerically simulated using SYSWELD program. The work pieces were heat-treated according to the TTT curves using thermomechanical treatment simulator and evaluated in terms of microstructure and micro hardness distribution. Finally, the secondary specimens were manufactured and investigated in monotonic tensile tests. Findings - The presented approach allows for the determination of the local properties of welded joints. In this study mechanical properties (stress-strain curves) of heat affected zone (HAZ) were successfully estimated using samples with reproduced microstructure. Furthermore, it was found out that the chemical composition in the HAZ was not influenced by the welding process. Thus, the HAZ microstructure can be successfully reproduced using base material. Additionally, the paper contains recommendations for simulation of the local microstructure and suggestions for the evaluation of the obtained results. Originality/value - The advantage of the proposed approach is the enlargement of the material volume with homogeneous microstructure so that different local properties like toughness, fatigue behavior, crack propagation or crashworthiness can be analyzed, what is technically infeasible for the weldments with small HAZ.
机译：目的-本文的目的是确定由结构性S355和高强度S960钢制成的10 mm厚对接焊缝的粗晶粒区域的局部性能。金相分析表明，S355和S960焊件的研究区域宽度太小，无法直接取样。因此，考虑到化学成分和焊件的冷却条件，通过热处理来制造具有再现的微观结构的样品。设计/方法/方法-热处理的基础是时间-温度转变（TTT）曲线，其形状由焊接和冷却参数定义。在这项研究中，TTT曲线是在焊接过程中通过实验确定的，并使用SYSWELD程序进行了数值模拟。使用热机械处理模拟器根据TTT曲线对工件进行热处理，并在显微组织和显微硬度分布方面进行评估。最后，制造了次级试样，并进行了单调拉伸试验。发现-提出的方法可以确定焊接接头的局部特性。在这项研究中，热影响区（HAZ）的机械性能（应力-应变曲线）已成功地使用具有复制的微观结构的样品进行了估算。此外，发现热影响区中的化学成分不受焊接过程的影响。因此，可以使用基材成功地再现HAZ微结构。此外，本文还包含有关模拟局部微观结构的建议和评估所得结果的建议。独创性/价值-提议的方法的优点是具有均匀的微观结构的材料体积增大，因此可以分析不同的局部特性，例如韧性，疲劳行为，裂纹扩展或耐撞性，这在技术上不适合于具有小热影响区的焊件。

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