Investigation into the influence of post-weld heat treatment on the microstructure and hardness of inconel X-750
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Author list: Peasura P., Poopat B.
Publisher: SAGE Publications
Publication year: 2015
Journal: Advances in Mechanical Engineering (1687-8132)
Volume number: 7
Issue number: 4
Start page: 1
End page: 11
Number of pages: 11
ISSN: 1687-8132
eISSN: 1687-8140
Languages: English-Great Britain (EN-GB)
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Abstract
This work describes a post-weld heat treatment for a precipitation-hardened nickel alloy. Inconel X-750 is a nickel-based superalloy for gas tungsten arc welding processes. The materials were heat-treated in two steps: solution and aging. The post-weld heat treatment variables examined in this study included post-weld heat treatment temperatures of 705°C, 775°C, and 845°C and post-weld heat treatment time of 2-24 h in 2-h increments. The resulting materials were examined using the full factorial design of experiments to determine the resulting material hardness and observed with optical microscopy, scanning electron microscopy, and energy dispersive X-ray spectroscopy in the fusion zone and heat-affected zone. The results show that a longer post-weld heat treatment time corresponds to larger γ' precipitates and a smaller amount of Cr23C6 at the grain boundaries, which can decrease the overall hardness. The post-weld heat treatment analysis indicates that an increase in the amount of γ' results in better mechanical properties for particles with octagonal shapes and a small size. A factorial analysis, which was conducted on the relationship between the post-weld heat treatment temperature and time to the hardness of the fusion zone, had a 95% confidence level. © The Author(s) 2015.
Keywords
γ' precipitates
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