ABSTRACT In the present study, dissimilar weld joint was prepared using the P91 and P92 steel plate of 8-mm thickness, using the multi-pass gas tungsten arc (GTA) welding with filler (weld 1) and autogenous tungsten inert gas welding (A-TIG) process (weld 2). Evolution of δ-ferrite patches was studied in weld zone and heat affected zone (HAZ) for both weld 1 and weld 2. Effect of varying post weld heat treatment (PWHT) duration was also studied on δ-ferrite patches and mechanical properties of the dissimilar weld joint. PWHT was carried out at 760°C. For weld 2, weld zone showed poor impact toughness and higher peak hardness as compared to weld 1. After the PWHT, a considerable reduction in hardness was obtained for both weld 1 and weld 2,while impact toughness of weld zone showed a continuous increment with PWHT duration. For weldments characterisation, optical microscope, scanning electron microscope (SEM) and microhardness tester were utilised.

中文翻译：

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异种 P91 和 P92 钢焊接接头的表征

摘要 在本研究中，使用 8 毫米厚的 P91 和 P92 钢板制备异种焊接接头，使用多道钨极气体保护焊（焊缝 1）和自熔钨极惰性气体保护焊（A -TIG) 工艺（焊接 2）。在焊缝 1 和焊缝 2 的焊缝区和热影响区 (HAZ) 中研究了 δ-铁素体补片的演变。还研究了不同焊后热处理 (PWHT) 持续时间对 δ-铁素体补片和机械性能的影响异种焊缝。PWHT 在 760°C 下进行。焊缝 2 与焊缝 1 相比，焊缝区的冲击韧性较差，峰值硬度较高。焊后焊后，焊缝 1 和焊缝 2 的硬度均显着降低，而焊缝区的冲击韧性随PWHT 持续时间。