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首页> 外文期刊>Metallurgical and Materials Transactions A >Notched Tensile and Impact Fracture of Ti-15-3 Laser Welds
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Notched Tensile and Impact Fracture of Ti-15-3 Laser Welds

机译：Ti-15-3激光焊缝的缺口拉伸和冲击断裂

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摘要

The notched tensile strength (NTS) and impact toughness of Ti-15V-3Cr-3Sn-3Al (β-type titanium alloy Ti-15-3) laser welds aged at temperatures ranging from 590 K to 866 K (317 °C to 593 °C) were determined, and the results were compared to those of unwelded Ti-15-3 plates aged at the same temperature. At a given aging temperature, α precipitates in welded specimens were finer and exhibited higher hardness than those in unwelded specimens. Among the tested specimens, the weld aged at 644 K (371 °C) was most susceptible to notch sensitivity. In those welds aged at or above 755 K (482 °C), the coarse columnar structure was prone to interdendritic fracture during notched tensile tests, which reduced the NTS of the weld relative to that of the unwelded plate aged at an equivalent temperature. Of the tested specimens, the weld that was not subjected to the postweld aging treatment possessed the highest impact toughness among the specimens.
机译：Ti-15V-3Cr-3Sn-3Al（β型钛合金Ti-15-3）激光焊缝的缺口抗拉强度（NTS）和冲击韧性在590 K至866 K（317°C至593）的温度下进行时效确定温度，然后将结果与在相同温度下时效的未焊接Ti-15-3板进行比较。在给定的时效温度下，焊接试样中的α析出物比未焊接试样中的析出物更细，并且具有更高的硬度。在测试样品中，在644 K（371°C）下时效的焊缝最容易受到缺口敏感性的影响。在755 K（482°C）或以上时效的那些焊缝中，粗糙的柱状结构在缺口拉伸试验中易于发生枝晶间断裂，相对于在相同温度下时效的未焊接板，NTS降低了。在测试样本中，未经焊后时效处理的焊缝在样本中具有最高的冲击韧性。

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