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利用不同热输入条件下的埋弧焊焊接实验,对热轧态2205 DSS进行了焊接接头显微组织的观察与分析,并对其拉伸力学性能进行了测试。结果表明:在5组热输入条件下,焊缝金属的显微组织形貌特征接近,均为近似四边形的块状奥氏体和少量平行的魏氏奥氏体板条分布在铁素体基体中;随着热输入的增大,块状奥氏体尺寸逐渐增大,魏氏奥氏体的切变形成受到抑制,奥氏体的体积分数逐渐升高;随着热输入的增大,HAZ宽度逐渐增大;焊接接头的屈服强度、抗拉强度以及断后伸长率随着热输入的增大均呈现出先升高后降低的变化规律,在热输入为16.48 kJ/cm时(奥氏体与铁素体体积比接近1∶1)焊接接头的拉伸力学性能最佳。
Under the condition of different heat input, the microstructure of 2205 DSS welded joints was observed and analyzed, and the tensile mechanical properties were tested. The results show that under the heat input conditions of 5 groups, the microstructure and microstructure of the weld metal are similar, and the massive austenite and the few parallel austenite austenite strips, both of which are nearly quadrilateral, are distributed in the ferrite matrix ; With the increase of heat input, the size of massive austenite gradually increases, the formation of Wei austenite is inhibited and the volume fraction of austenite gradually increases. With the increase of heat input, HAZ width increases gradually. The yield strength, tensile strength and elongation at break of welded joints increase first and then decrease with increasing heat input. When the heat input is 16.48 kJ / cm The volume ratio of volume to ferrite is close to 1: 1), the mechanical properties of welded joints are the best.