回火温度对厚壁P92钢埋弧焊接头性能的影响

Effect of tempering temperature on properties of thick wall P92 steel SAW joint

本文通过对厚壁P92钢埋弧自动焊焊接接头不同温度的回火试验,对比分析其焊接接头的抗拉强度、冲击吸收能量、维氏硬度、显微组织的差异。提出由于厚壁P92钢埋弧焊热输出量大,熔池体积大,经不同温度回火时,受到焊缝中粗大M-A组元和M_（23）C_6及M_6C等因素的影响,在770℃回火热处理时,焊接接头的可获得最优的综合力学性能和显微组织。

The comparisons of tensile strength,impact absorbed energy,Vickers hardness and microstructure of welded joint were analyzed by tempering test of thick wall P92 steel SAW joint at different temperatures.The results show that the heat output of thick wall P92 steel SAW is large.When the weld pool is large in volume and tempered at different temperatures,it is affected by the factors such as coarse M-A component,M_（23）C_6and M_6C,etc.The optimum comprehensive mechanical properties and microstructure of welded joints can be obtained by tempering heat treatment at 770℃.