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采用焊接热模拟和热力学计算相结合的方法,研究了锆处理对低合金高强船体钢大线能量焊接粗晶区组织与性能的影响。结果表明:锆处理钢对钢中形成的氧化物类型、粒度及分布存在显著影响。当钢中锆的质量分数低于85×10-6时,钢中形成复合的Zr-Ti-O氧化物颗粒。其中锆的质量分数为45×10-6时,钢中形成等量的钛、锆氧化物,此时氧化物颗粒最为细小,微量锆对含钛氧化物颗粒的细化作用最为明显。锆的质量分数大于85×10-6时,钢中只形成单一的ZrO2颗粒。复合Zr-Ti氧化物在低合金高强船体钢大线能量焊接时具有促进晶内针状铁素体的能力,显著地提高钢大线能量焊接粗晶区的低温韧性。
The effects of zirconium treatment on the microstructure and properties of large-area energy welded coarse-grained steel in low-alloy high-strength hull steel were studied by the combination of welding thermal simulation and thermodynamic calculation. The results show that the zirconium treated steel has a significant effect on the type, size and distribution of oxides formed in the steel. When the mass fraction of zirconium in the steel is less than 85 × 10 -6, composite Zr-Ti-O oxide particles are formed in the steel. In which the mass fraction of zirconium 45 × 10-6, the steel to form the same amount of titanium, zirconium oxide, then the oxide particles the most small, trace zirconium on the refining of titanium oxide particles the most obvious. When the mass fraction of zirconium is more than 85 × 10-6, only a single ZrO2 particle is formed in the steel. The composite Zr-Ti oxide has the ability of promoting intragranular acicular ferrite during the welding of large-line energy of low-alloy high-strength hull steel and significantly improves the low-temperature toughness of the coarse-grained area welded by large wire energy.