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通过光学显微镜和电子显微镜对比分析了Zr-Ti复合脱氧和传统Al脱氧两种脱氧方式低合金高强度钢在大线能量埋弧焊条件下焊接热影响区粗晶区的组织,研究了两种脱氧方式对粗晶区低温冲击韧性的影响。结果表明:经过Zr-Ti复合脱氧处理后,低合金高强度钢中形成了许多细小弥散的Zr-Ti复合氧化物粒子,这些粒子具有高温稳定性,在焊接过程中起到了钉扎焊接热影响区粗晶区奥氏体晶界移动来抑制晶粒长大和促进针状铁素体形成,所以在较大的埋弧焊焊接线能量(51 kJ/cm)条件下改善了钢板的低温冲击韧性。
The microstructure of the coarse heat-affected zone of the low-alloy high-strength steel with Zr-Ti composite deoxidation and the conventional Al-deoxidation are compared and analyzed by optical microscope and electron microscope. The effects of two Effect of deoxidation on low temperature impact toughness of coarse grain. The results show that many Zr-Ti composite oxide particles are formed in the low-alloy high-strength steel after Zr-Ti composite deoxidation treatment. These particles have high temperature stability and heat-affected by pinning during welding The coarse grain region austenite grain boundaries to inhibit grain growth and promote the formation of acicular ferrite, so the larger submerged arc welding wire energy (51 kJ / cm) under the conditions of the steel to improve the low temperature impact toughness .