机械振动对Q345B钢焊接接头组织与力学性能的影响

发布时间：2018-01-30 21:45

本文关键词： 机械振动加速度 QB 焊接接头力学性能组织　出处：《热加工工艺》2016年19期 　论文类型：期刊论文

【摘要】：研究了不同焊接热输入下机械振动加速度对Q345B钢焊接接头力学性能和显微组织的影响。结果表明,在同一机械振动加速度下,焊接接头的屈服强度从大至小的焊接热输入依次为:22.8kJ/cm26.6kJ/cm31.6kJ/cm,焊接接头的断后伸长率从大至小的焊接热输入依次为:31.6kJ/cm26.6kJ/cm22.8kJ/cm。当焊接热输入为26.6和31.6k J/cm时焊接接头的抗拉强度随着机械振动加速度的增加而增大。当焊接热输入为22.8kJ/cm时,机械振动加速度为0和15 m/s2时的焊缝区域的组织都为先共析铁素体+少量珠光体,在晶内还有针状铁素体和极少量的粒状贝氏体组织;当焊接热输入为26.6、31.6kJ/cm时,不同机械振动加速度下焊缝组织主要为先共析铁素体和柱状晶;随着焊接热输入的增加,Q345B钢焊接接头熔合区的组织呈逐渐粗化的趋势。施加机械振动可以一定程度地改善熔合区的组织形态。
[Abstract]:The effect of mechanical vibration acceleration on mechanical properties and microstructure of Q345B steel welded joints under different welding heat input was studied. The yield strength of welded joints from large to small welding heat input is: 1 22.8kJ / cm 26.6kJ / cm 31.6kJ / cm. After breaking elongation of welded joint is: 31.6 kJ / cm 26.6kJ / cm 22.8kJ / cm. When welding heat input is 26.6 and 31.6k, respectively. The tensile strength of welded joints increases with the increase of mechanical vibration acceleration when the welding heat input is 22.8kJ / cm. When the mechanical vibration acceleration is 0 and 15 m / s ~ 2, the microstructure of the weld zone is preeutectoid ferrite with a small amount of pearlite, and acicular ferrite and a very small amount of granular bainite in the crystal. When the welding heat input is 26.6kJ / cm, the microstructure of weld is mainly proeutectoid ferrite and columnar crystal under different mechanical vibration acceleration. With the increase of welding heat input, the microstructure of fusion zone of Q345B steel shows a tendency of coarsening. Mechanical vibration can improve the microstructure of fusion zone to some extent.
【作者单位】：西京学院机械工程学院;武汉科技大学;
【分类号】：TG457.11
【正文快照】： Q345B钢的碳含量在0.2%以下,具有较好的综合性能和低温性能等优点,而被广泛应用于汽车、船舶、建筑等行业中。这种钢在使用传统焊接工艺时出现焊接接头力学性能不稳定、焊缝组织均匀性较差等特点,在一定程度上影响了其作为焊接结构件在工业领域的应用,有必要采用更加合理的焊

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