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针对X80钢级管线钢,采用平板堆焊、夏比冲击、扫描电镜等手段研究了不同总线能量和不同三丝线能量配比情况下的粗晶区韧性。结果显示:总线能量在40~53 k J/cm范围时,其粗晶区的冲击韧性均低于母材,总线能量变化对冲击韧性的影响幅度不大;当总线能量大小相当时,中丝和后丝的线能量与前丝线能量比值约为0.450时可获得较好的冲击韧性,此时粗晶区会形成交错分布的粒状贝氏体及数量较少且弥散分布的细短条状M-A组元。
For the X80 steel grade pipeline steel, the toughness of the coarse grain region under different bus energy and different three-wire energy ratio was studied by flat surfacing, Charpy impact and scanning electron microscope. The results show that the impact toughness of the coarse grain region is lower than that of the base metal when the bus energy is in the range of 40-53 kJ / cm, and the impact of the bus energy change on the impact toughness is not significant. When the bus energy is equivalent, And after wire filament energy and the former wire energy ratio of about 0.450 can get better impact toughness, coarse grain region will be formed at this time staggered distribution of granular bainite and a small number of dispersed and distributed thin strip of MA Component.