In this research the microstructure evolution and mechanical behavior of dissimilar weld between AISI 321 stainless steel (SS) and INCOLOY 825 using ERNiCrMo-3 (Inconel 625) filler wire were investigated. Electron back scattered diffraction (EBSD) analysis was used to characterize the weld substructure. The microstructural examination exhibited an austenitic matrix in either of the two base materials in which formation of Ti-bearing precipitates, more often with cubic morphology, were unveiled. An incomplete transformation of ferrite to austenite led to a significant accumulation of δ-ferrite at the heat affected zone (HAZ) of AISI 321 SS. An entirely austenitic structure accompanied by evidences of secondary phases, rich in Mo and Nb, at the inter-dendritic spaces in the weld metal were observed. Some columnar grains showed the <001> direction parallel to the normal direction relationship. The grain orientation spread map indicated that misorientation variations within the weld metal grains were significantly higher than those of the base metals and HAZs. Texture intensities of HAZs were relatively low. The abnormal grain growth observed in INCOLOY 825 HAZ had a significant effect on orientations of the austenite grains. However, it did not weaken the tensile strength of the weldment. Tensile specimen failure from SS side indicated that this material was more feeble comparing to the INCOLOY one and the weld area. Presence of brittle phases at the inter-dendritic spaces led to a fall in the weld impact toughness in comparison with the parent materials.

在这项研究中，研究了使用ERNiCrMo-3（Inconel 625）填充焊丝的AISI 321不锈钢（SS）与INCOLOY 825之间异种焊缝的组织演变和力学行为。电子背散射衍射（EBSD）分析用于表征焊接亚结构。显微组织检查在两种基材中的任何一种中均显示出奥氏体基质，其中揭示了含钛沉淀物的形成，这种沉积物通常具有立方形态。铁素体向奥氏体的不完全转变导致δ-铁素体在AISI 321 SS的热影响区（HAZ）大量聚集。在焊缝金属的枝晶间空间中观察到了完全为奥氏体的结构，并伴有富含钼和铌的第二相的证据。一些柱状晶粒显示<001> 方向平行于法线方向关系。晶粒取向分布图表明，焊接金属晶粒内的取向错误变化明显高于贱金属和HAZ。热影响区的纹理强度相对较低。在INCOLOY 825 HAZ中观察到的异常晶粒长大对奥氏体晶粒的取向有重大影响。但是，它不会削弱焊件的拉伸强度。SS侧的拉伸试样断裂表明，与INCOLOY 1和焊接区域相比，这种材料更微弱。与母体材料相比，在枝晶间空间存在脆性相导致焊接冲击韧性下降。晶粒取向分布图表明，焊接金属晶粒内的取向错误变化明显高于贱金属和HAZ。热影响区的纹理强度相对较低。在INCOLOY 825 HAZ中观察到的异常晶粒长大对奥氏体晶粒的取向有重大影响。但是，它不会削弱焊件的拉伸强度。SS侧的拉伸试样断裂表明，与INCOLOY 1和焊接区域相比，这种材料更微弱。与母体材料相比，在枝晶间空间存在脆性相导致焊接冲击韧性下降。晶粒取向分布图表明，焊接金属晶粒内的取向错误变化明显高于贱金属和HAZ。热影响区的纹理强度相对较低。在INCOLOY 825 HAZ中观察到的异常晶粒长大对奥氏体晶粒的取向有重大影响。但是，它不会削弱焊件的拉伸强度。SS侧的拉伸试样断裂表明，与INCOLOY 1和焊接区域相比，这种材料更微弱。与母体材料相比，在枝晶间空间存在脆性相导致焊接冲击韧性下降。在INCOLOY 825 HAZ中观察到的异常晶粒长大对奥氏体晶粒的取向有重大影响。但是，它不会削弱焊件的拉伸强度。SS侧的拉伸试样断裂表明，与INCOLOY 1和焊接区域相比，这种材料更微弱。与母体材料相比，在枝晶间空间存在脆性相导致焊接冲击韧性下降。在INCOLOY 825 HAZ中观察到的异常晶粒长大对奥氏体晶粒的取向有重大影响。但是，它不会削弱焊件的拉伸强度。SS侧的拉伸试样断裂表明，与INCOLOY 1和焊接区域相比，这种材料更微弱。与母体材料相比，在枝晶间空间存在脆性相导致焊接冲击韧性下降。