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采用复合微合金化的成分设计,通过TMCP(热机械处理)工艺开发了适应大线能量焊接的FH500高强船板钢。运用埋弧焊和垂直气电立焊对FH500船板钢进行了焊接试验,对两种焊接方式的焊接接头分别进行了拉伸、弯曲、冲击等力学试验,研究了不同热输入值对接头力学性能的影响;运用透射电镜对焊接热影响区组织析出物进行了分析。结果表明:FH500高强船板钢组织以针状铁素体为主,具有良好的强韧性匹配;两种焊接方式接头力学性均能满足船级社标准。焊接热影响区(HAZ)组织为针状铁素体和贝氏体组织,晶内含有大量纳米级析出物,能谱显示,其成分为钛铌的复合析出物。
Using composite microalloying composition design, the FH500 high-strength steel plate ship adapted to large-wire energy welding has been developed through TMCP (thermo-mechanical process). The welding experiments of FH500 shipbuilding steel with submerged arc welding and vertical gas vertical welding were carried out. Mechanical tests such as tensile, bending and impact were carried out on the welded joints of the two welding methods respectively. The effects of different heat input values on the joint mechanics The influence of the performance was analyzed. The transmission electron microscopy was used to analyze the tissue precipitates in the heat-affected zone. The results show that the microstructure of FH500 high strength steel is mainly acicular ferrite, and has good toughness matching. The mechanical properties of both welded joints can meet the requirements of classification society. Heat-affected zone (HAZ) is composed of acicular ferrite and bainite. There are a large number of nano-scale precipitates in HAZ. The energy spectrum shows that HAZ is a composite precipitates of titanium and niobium.