| Title: |
Microstructural Study of Welded and Repair Welded Dissimilar Creep-Resistant Steels Using Different Filler Materials †. |
| Authors: |
Chionopoulos, Stavros; Zervas, Aimilianos; Mathioudakis, Michail |
| Source: |
Engineering Proceedings; 2025, Vol. 119 Issue 1, p9, 9p |
| Subject Terms: |
Filler materials; Welding; Heat resistant steel; Heat treatment; Metallurgical research; Welded steel structures; Gas tungsten arc welding; Microhardness |
| Abstract: |
This study examines initial and repair welds between creep-resistant steels, P22 and P91, using ER90S-B3 and ERNiCrMo-3 steel-based and nickel-based filler materials, respectively. TIG welding with and without PWHT was applied. Microstructural evaluation revealed martensitic transformation in HAZ, decarburization in repairs, and the presence of Laves phase. Ni-based filler welds showed greater inhomogeneity. Hardness profiles confirmed softening in P91 HAZ and improved uniformity with PWHT. Steel-based filler provided better compatibility, especially in repair scenarios. The results support the use of ER90S-B3 with PWHT for enhanced reliability. Our findings align with EPRI guidelines and standards for weld integrity in high-temperature piping applications. [ABSTRACT FROM AUTHOR] |
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| Database: |
Complementary Index |