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.
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