| 刘义,李敬,杨跃辉.E40船板钢焊接接头组织性能分析[J].唐山学院学报,2020,32(6):46-49,71 |
| E40船板钢焊接接头组织性能分析 |
| Analysis on Properties of the Welded Joint Microstructure in E40 Ship Plate Steel |
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| DOI：10.16160/j.cnki.tsxyxb.2020.06.010 |
| 中文关键词: E40船板钢 焊接接头 低温韧性 显微组织 |
| 英文关键词: E40 ship plate steel welded joint low-temperature toughness microstructure |
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| 摘要点击次数: 7276 |
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| 中文摘要: |
| 对13 mm厚E40船板钢进行焊接，测定了焊接接头不同位置的力学性能，并观察了焊接接头不同位置的显微组织，结果表明，在焊缝区域晶粒较为粗大，焊缝厚度中心为铁素体和珠光体，焊缝上表面为粗大的柱状晶，导致此处的韧性较差，硬度较低；在焊缝厚度方向的中心位置向一侧母材偏移4 mm后为热影响区的过热区，此位置的组织中存在大量的魏氏组织，故硬度较高，但不利于韧性的改善；偏移6~8 mm后进入热影响区的正火区，组织为细小的铁素体与珠光体，因此硬度大幅降低；偏移10 mm后由于受到热应变失效脆化影响该处的硬度达到最高值，此处组织为粗化的针状铁素体与准多边形铁素体；由焊缝中心偏移12 mm后进入母材区，其低温韧性基本等于母材。 |
| 英文摘要: |
| After the 13 mm thick E40 ship plates steel being welded, the mechanical properties of the welded joint microstructures on different positions are measured. The results show that: The grain is coarse in the welded seam, and in the center of the actual throat is ferrite and pearlite, while on the upper surface of the seam is coarse columnar crystal,which leads to the poor toughness and low hardness here;Four mm away from actual throat's center to the base metal is the over-heated zone, where there are a lot of Widmanstatten structures, which leads to the high hardness but an unfavorable condition for toughness improvement; The normalized zone is 6~8 mm away from the center, where the microstructures are fine ferrite and pearlite, so the hardness is greatly reduced; The hardness reaches the highest value due to the influence of thermal-strain embrittlement where the position is 10 mm away from the center and the microstructures are coarse acicular ferrite and quasi-polygonal ferrite; Twelve mm away from the center is the base metal, where the low-temperature toughness is almost equal to that of the base metal. |
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