Effect of Heat Treatment on the Microstructure and Mechanical Properties of Rotary Friction Welded Dissimilar IN718 to SS304L Alloys

Effect of Heat Treatment on the Microstructure and Mechanical Properties of Rotary Friction Welded Dissimilar IN718 to SS304L Alloys

The present study investigated the effect of heat treatment (pre- and post-weld) on the microstructure and mechanical properties of an SS304L/IN718 dissimilar rotary friction welded alloy. Optical and scanning electron micrographs of the dissimilar rotary friction welded SS304L/IN718 joints in solut...

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Bibliographic Details
Published in:Applied sciences Vol. 13; no. 6; p. 3584
Main Authors: Pavan, Perumandla, Talari, Mahesh Kumar, Babu, Nagumothu Kishore, Rehman, Ateekh Ur, Srirangam, Prakash
Format: Journal Article
Language:English
Published: Basel MDPI AG 01-03-2023
Subjects:
Alloys
Aluminum
Aluminum alloys
Analysis
Base metal
Carbon
Cooling
Corrosion resistance
Dissimilar material joining
Dissimilar materials
dissimilar rotary friction welding
dynamic recrystallization (DRX)
Electron micrographs
Friction
Friction welding
Grain boundaries
Grain size
Heat affected zone
Heat treatment
Heat treatments
IN718
Mechanical properties
Metal fatigue
Microstructure
Nuclear power plants
Post-weld heat treatment
Precipitates
SS304L
Stainless steel
Strengthening
Superalloys
Tensile strength
Welded joints
Welding
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Summary:The present study investigated the effect of heat treatment (pre- and post-weld) on the microstructure and mechanical properties of an SS304L/IN718 dissimilar rotary friction welded alloy. Optical and scanning electron micrographs of the dissimilar rotary friction welded SS304L/IN718 joints in solution-treated (ST), solution-treated and aged (STA), and post-weld heat treatment (PWHT) conditions revealed defect-free welds. Furthermore, various zones were observed across the weld region, namely the fully deformed zone (FDZ), thermomechanical affected zone (TMAZ), heat affected zone (HAZ), and base material (BM). Among the SS304L/IN718 dissimilar friction welds with different heat treatment conditions (prior ST and STA, PWHT), the PWHTed dissimilar welds exhibited excellent mechanical properties, which could be attributed to the formation of the strengthening precipitates γ′ and γ″ during double aging in PWHT. In contrast, the mechanical properties were found to be the poorest in the STA condition, possibly due to the dissolution of the strengthening precipitates γ′ and γ″ during friction welding. It was observed that the SS304L/IN718 dissimilar friction welds in the ST and STA conditions failed in the HAZ of the SS304L side, away from the weld interface, indicating that the weld region was stronger than the weakest base metal (SS304L) in the various joints.
ISSN:2076-3417
2076-3417
DOI:10.3390/app13063584