D36高强钢摩擦塞焊焊接接头组织和性能研究

发布时间：2018-04-15 22:25

本文选题：摩擦塞焊 + 焊接热循环　；参考：《天津大学学报(自然科学与工程技术版)》2017年07期

【摘要】：利用自主研发的摩擦塞焊设备对摩擦塞焊圆柱形试样进行试验,试样材料选择D36高强钢,通过温度巡检仪采集焊接过程中温度演化数据,试验后对焊接接头进行宏观形貌、金相组织、硬度以及拉伸性能的研究.结果发现:在焊接过程中,温度先迅速升高,之后缓慢降低,塞孔底部最先升温,温度峰值出现在塞孔侧壁中间处;塞棒端部和塞孔底部带有倒角的试样可以获得无缺陷的焊接接头;焊接接头中母材组织为轧制后的铁素体和珠光体的带状组织,焊缝组织和上部热影响区组织为上贝氏体,而塞孔底部倒角处的热影响区以细小的铁素体和珠光体组织为主;焊接接头的硬度分布一般为母材最低,热影响区次之,焊缝最高;当塞棒端部和塞孔底部的倒角达到4,mm时,摩擦塞焊焊接接头拉伸试验的断裂位置在母材处,保证了焊接接头的拉伸性能.
[Abstract]:The friction plug welding equipment was used to test the cylindrical specimen of friction plug welding. The sample material was D36 high strength steel. The temperature evolution data during the welding process were collected by the temperature inspection instrument, and the macroscopic morphology of the welded joint was carried out after the test.Metallographic structure, hardness and tensile properties.The results show that in the welding process, the temperature rises rapidly, then decreases slowly, the bottom of the plug first heats up, and the temperature peak appears in the middle of the side wall of the plug hole.The specimens with chamfering at the end of the plug rod and at the bottom of the plug hole can obtain the welded joint without defects; the parent metal structure in the welded joint is the strip structure of the rolled ferrite and pearlite, and the microstructure of the weld and the upper heat-affected zone is upper bainite.The heat affected zone at the bottom corner of the plug hole is mainly composed of fine ferrite and pearlite. The hardness distribution of the welded joint is generally the lowest in the base metal, the second in the heat affected zone, and the highest in the weld, and when the chamfer between the end of the plug rod and the bottom of the plug hole reaches 4 mm,The fracture position of the friction plug welded joint is at the base metal, which ensures the tensile properties of the welded joint.
【作者单位】：天津大学材料科学与工程学院;天津市现代连接技术重点实验室;
【基金】：国家高技术研究发展计划(863计划)资助项目(2011AA090302)~~
【分类号】：TG457.11

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