冷却时间对2205双相不锈钢焊接热影响区组织与性能的影响

采用热模拟和其它方法研究了2205双相不锈钢的模拟焊接热影响区（HAZ）的冲击韧度和金相组织的关系，探讨了冷却时间t5／8和t12／8对模拟HAZ冲击韧度的影响规律。结果表明：冷却时间对该钢的组织和性能有很大的影响，随冷却时间的增加，铁素体含量减少，奥氏体含量增加，铁素体中的金属中间相析出增多。固定t8／5时，随t12／8的增加，冲击韧度增强；而固定t12／8时，随t8／5的增加，冲击韧度降低。

Effect of Cooling Time on Microstructure and Property of 2205 Duplex Stainless Welding Heat Affect Zone

The relationship of the microstructures and impact toughness of simulated welding Heat Affect Zone (HAZ) in 2205 Duplex Stainless Steel (DSS) were investigated by using material thermal simulator technique and others analyses methods. The effect rules of cooling time on the impact toughness of simulated HAZ were studied at the same time. The results show that the cooling time has strong influences on the impact toughness of the simulated HAZ, that the ferrite content decreases and precipitate of carbide and nitride in ferrite increases as increasing cooling time, that impact toughness increases with the increase of the cooling time t12/8 for a certain cooling time t8/5, and that that impact toughness decreases with the increase of the cooling time t8/5 for a certain cooling time t12/8.