X90钢直缝埋弧焊管焊接接头的组织和性能
发布时间：2018-12-20 11:47
【摘要】：利用光学显微镜、扫描电镜分析了某厂生产的X90钢管线钢焊接接头的显微组织,通过硬度试验和冲击试验测试了其硬度和韧性变化规律。试验结果显示,其焊缝为针状铁素体和粒状贝氏体组织,熔合区和粗晶区为粗大粒状贝氏体组织,细晶区为多边形铁素体、珠光体和MA组织,混晶区为粒状贝氏体、多边形铁素体、珠光体和MA的混合组织;热影响区有局部硬化和软化现象,且内焊缝硬度高于外焊缝;试验温度高于-20℃时,热影响区的冲击吸收能量和剪切断面率高于焊缝,低于-40~-20℃区间某个值后,冲击性能将降低至焊缝性能以下;热影响区的韧脆转变温度约在-50℃附近,而焊缝的韧脆转变温度约在-70℃附近。
[Abstract]:The microstructure of the welded joints of X90 steel tube made in a factory was analyzed by optical microscope and scanning electron microscope. The hardness and toughness of the welded joints were tested by hardness test and impact test. The results show that the weld is acicular ferrite and granular bainite structure, the fusion zone and coarse grain zone are coarse granular bainite structure, the fine grain zone is polygonal ferrite, pearlite and MA structure, and the mixed crystal zone is granular bainite. Polygonal ferrite, pearlite and MA mixed structure; The heat affected zone has the phenomenon of local hardening and softening, and the hardness of the inner weld is higher than that of the outer weld. When the test temperature is higher than -20 鈩，
本文编号：2387953
[Abstract]:The microstructure of the welded joints of X90 steel tube made in a factory was analyzed by optical microscope and scanning electron microscope. The hardness and toughness of the welded joints were tested by hardness test and impact test. The results show that the weld is acicular ferrite and granular bainite structure, the fusion zone and coarse grain zone are coarse granular bainite structure, the fine grain zone is polygonal ferrite, pearlite and MA structure, and the mixed crystal zone is granular bainite. Polygonal ferrite, pearlite and MA mixed structure; The heat affected zone has the phenomenon of local hardening and softening, and the hardness of the inner weld is higher than that of the outer weld. When the test temperature is higher than -20 鈩，
本文编号：2387953
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