两种冷却方式下双相钢2205堆焊层性能分析

Analysis of the Performance of Duplex Stainless Steel Surfacing Layer under Two Cooling Methods

采用药芯焊丝CO_2气保焊(FCAW)在低碳钢表面堆焊一层双相不锈钢表层,分析了水冷和空冷冷却方式对双相钢堆焊层的力学性能、耐腐蚀性能以及铁素体-奥氏体(α-γ)两相组织的影响。结果表明,水冷和空冷冷却方式对堆焊层的力学性能无显著影响;水冷时堆焊层铁素体含量为45.17%,比空冷更接近两相平衡,其显微组织为块状铁素体和沿晶界或亚晶界分布的针状奥氏体;水冷时堆焊层具有更优异的耐腐蚀性能,平均腐蚀速率为0.488 mm/a。

Here were studied the mechanical properties,corrosion resistance,and the ferrite-austenite(α-γ)dual-phase structure of the overlay of duplex stainless steel coated on the low-carbon steel by CO2 flux-cored arc welding(FCAW)and cooled in water and air.The results showed that the methods of water or air cooling had no significant effect on the mechanical properties of the surfacing layer;that the ferrite content of the surfacing layer cooled in water could reach 45.17%,which was more closed to equilibrium than in air cooling,and that the surfacing layer was mainly composed of block ferrite and acicular austenite distributed along the ferrite crystal or sub-crystal boundaries;that the surfacing layer cooled in water had superior corrosion resistance and the average corrosion rate was 0.488 mm/a.