Abstract The current work has been performed to characterize the heterogeneous P91 welded joint. The gas tungsten arc welded (GTAW) P91 welds joint has been prepared using the dissimilar Inconel 617 filler. The P91 welded plates have been subjected to post-weld normalizing and tempering (PWNT) heat treatments for varying normalizing temperature in the range of 950–1150 °C. To homogenize the microstructure across the welded joint, tempering has been performed at 760 °C for 2 h for each normalized conditions. The tensile and microhardness tests have been conducted to determine the mechanical properties of the welded joint in as-welded and heat-treated conditions. The microstructure characterization has been performed for the weld fusion zone (WFZ) and efforts have been made to develop a relation between microstructure evolutions and mechanical behavior of the welded joint. Microstructure analysis was carried out with optical and field scanning electron microscope (FESEM). The optimum combination of strength and ductility was obtained for the sample heat-treated at 1050 °C for 40 min (normalized)+760 °C/2 h (tempering). The lower strength was obtained for the Inconel 617 filler as compared to P91 filler, while ductility obtained for Inconel 617 filler was higher than that of P91 filler.

中文翻译：

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异质P91焊接接头的显微组织和力学行为研究

摘要 目前的工作已完成表征异质 P91 焊接接头。气体钨极电弧焊 (GTAW) P91 焊接接头已使用不同的 Inconel 617 填料制备。P91 焊接板已进行焊后正火和回火 (PWNT) 热处理，以在 950–1150 °C 范围内改变正火温度。为了使整个焊接接头的微观结构均匀，每个正火条件都在 760 °C 下进行了 2 小时的回火。已经进行了拉伸和显微硬度测试，以确定焊接接头在焊接和热处理条件下的机械性能。已对焊缝熔合区 (WFZ) 进行了微观结构表征，并已努力开发微观结构演变与焊接接头力学行为之间的关系。用光学和场扫描电子显微镜（FESEM）进行微观结构分析。对于在 1050 °C 下热处理 40 分钟（标准化）+760 °C/2 小时（回火）的样品，获得了强度和延展性的最佳组合。与 P91 填料相比，Inconel 617 填料获得的强度较低，而 Inconel 617 填料获得的延展性高于 P91 填料。对于在 1050 °C 下热处理 40 分钟（标准化）+760 °C/2 小时（回火）的样品，获得了强度和延展性的最佳组合。与 P91 填料相比，Inconel 617 填料获得的强度较低，而 Inconel 617 填料获得的延展性高于 P91 填料。对于在 1050 °C 下热处理 40 分钟（标准化）+760 °C/2 小时（回火）的样品，获得了强度和延展性的最佳组合。与 P91 填料相比，Inconel 617 填料获得的强度较低，而 Inconel 617 填料获得的延展性高于 P91 填料。