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首页> 外文会议>ASME international conference on ocean, offshore and arctic engineering >EFFECT OF GMAW HEAT INPUT ON THE MICROSTRUCTURE AND MECHANICAL AND FATIGUE BEHAVIOR OF DISSIMILAR WELDS OF ULTRAHIGH STRENGTH STEEL AND DUPLEX STAINLESS STEEL
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EFFECT OF GMAW HEAT INPUT ON THE MICROSTRUCTURE AND MECHANICAL AND FATIGUE BEHAVIOR OF DISSIMILAR WELDS OF ULTRAHIGH STRENGTH STEEL AND DUPLEX STAINLESS STEEL

机译：GMAW热输入对超高强度钢和双相不锈钢异种钢的显微组织和力学及疲劳性能的影响

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摘要

The effect of heat input on the microstructure and mechanical properties of dissimilar welds of direct-quenched ultrahigh strength steel (Optim 960 QC) and duplex stainless steel (UNS S32205) was studied. The effect of heat input on grain coarsening and the proportion of bainite-martensite on the ferritic side and ferrite-austenite on the duplex side was clearly evident. The hardness profile showed a trend of increasing hardness with lower heat input. Enhancement in tensile strength corresponded to lower heat input and increase in hardness. The elongation values and bend behavior were roughly the same for all the specimens; there was no clear link to the heat input. Moderate heat input gave optimum impact toughness in the weld and the ferritic HAZ. The fatigue performance of the specimens demonstrated the profound influence of geometrical effects. However, the effect of microstructural characteristics on fracture location was also observed.
机译：研究了热输入对直接淬火的超高强度钢（Optim 960 QC）和双相不锈钢（UNS S32205）的异种焊缝的组织和力学性能的影响。热量输入对晶粒粗化的影响以及铁素体侧贝氏体-马氏体的比例和双相侧铁素体-奥氏体的比例是显而易见的。硬度分布显示出随着较低的热输入而增加硬度的趋势。拉伸强度的提高对应于较低的热输入和硬度的增加。所有样品的伸长率值和弯曲行为都大致相同。热量输入之间没有明确的联系。适度的热量输入可在焊缝和铁素体热影响区提供最佳的冲击韧性。样品的疲劳性能证明了几何效应的深远影响。但是，也观察到了微观结构特征对裂缝位置的影响。

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