中文摘要不锈钢多层多道焊接头组织研究 本文以2205双相不锈钢为焊接材料，E2209焊条为填充材料，采用焊条电弧焊方法实施多层多道焊。焊后对焊接接头进行金相制备及硬度值的测量，然后分析焊缝及热影响区金相组织并对所得接头的结构组织进行表征，最后分析焊缝及热影响区组织对硬度的影响。试验结果表明，焊缝和热影响区奥氏体相含量由打底层向填充层方向依次减少，铁素体含量随之增多。焊缝区的奥氏体含量较热影响区的奥氏体含量多。焊缝和热影响区的硬度随铁素体相含量的增加呈降低趋势。关键词：双相不锈钢；热影响区；奥氏体；微观组织；硬度I毕业设计说明书（论文）英文摘要Title M icrostructure Research Of Multi-layer And Multi-pass Welding Of S tainless S teel The multi-layer and multi-pass welding technology of duplex stainless steel 2205 was investigated in this paper. The filling material is E2209. After welding, the work of Metallographic Preparation and hardness test was done. Then the Metallographic structure of weld bead and HAZ was researched and the structure of the joint was characterized .At last, the effect on the hardness of the weld bead and HAZ was also researched. The results show that, the number of austenite reduces from the backing weld to the filling bead while the ferrite increases. The content of austenite in the weld bead is more than that in the HAZ. The hardness of the weld bead and HAZ decreases with the decrease of ferrite.Keywords: Duplex Stainless Steel; HAZ; Austenite; Metallographic structure; HardnessII目 录前 言.................................................................................................................................1第一章绪论.......................................................................................................................21.1 不锈钢概述.............................................................................................................21.1.1 不锈钢的发展............................
