Parametric effect on the microstructure of direct metal deposited Inconel 718.
Saved in:
| Title: | Parametric effect on the microstructure of direct metal deposited Inconel 718. |
|---|---|
| Authors: | Gullipalli, Chaitanya1 (AUTHOR), Thawari, Nikhil1 (AUTHOR), Burad, Prayag1 (AUTHOR), Gupta, T V K1 (AUTHOR) tvkgupta@mec.vnit.ac.in |
| Source: | Materials & Manufacturing Processes. 2022, Vol. 37 Issue 10, p1165-1174. 10p. |
| Subjects: | Metal microstructure, Dendritic crystals, Grain size, Manufacturing processes, Square root, Inconel, Microhardness |
| Abstract: | Direct metal deposition (DMD) technique results in unique microstructure when compared with the traditional manufacturing processes because of rapid solidification and the combined effect of input process parameters. However, parametric effect on the microstructure evolution is not thoroughly understood. This paper deals with the investigations carried to understand the effect of process parameters on the microstructure characteristics of Inconel 718 deposits fabricated by DMD process. The microstructure observations revealed columnar dendrites at the bottom, middle portions, and equiaxed grains in the top portion of the deposits. The different grain morphologies obtained are primarily due to the interaction effect of thermal gradient and solidification velocity. Furthermore, analysis is carried on the microstructural characteristics, and cooling rates during solidification were evaluated. It was observed that the cooling rates are varying systematically with input parameters. In addition, the grain size is observed to be a function of cooling rate. EDS analysis performed on the deposits, where the elemental mapping revealed long chains of Nb-rich phases at the interdendritic regions. The microhardness measurements done using Vickers indentation method show a minimal variation with process parameters; the hardness followed a linear relationship with the reciprocal square root of grain width. [ABSTRACT FROM AUTHOR] |
| Copyright of Materials & Manufacturing Processes is the property of Taylor & Francis Ltd and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | Engineering Source |
|
Full text is not displayed to guests.
Login for full access.
|
|
| Abstract: | Direct metal deposition (DMD) technique results in unique microstructure when compared with the traditional manufacturing processes because of rapid solidification and the combined effect of input process parameters. However, parametric effect on the microstructure evolution is not thoroughly understood. This paper deals with the investigations carried to understand the effect of process parameters on the microstructure characteristics of Inconel 718 deposits fabricated by DMD process. The microstructure observations revealed columnar dendrites at the bottom, middle portions, and equiaxed grains in the top portion of the deposits. The different grain morphologies obtained are primarily due to the interaction effect of thermal gradient and solidification velocity. Furthermore, analysis is carried on the microstructural characteristics, and cooling rates during solidification were evaluated. It was observed that the cooling rates are varying systematically with input parameters. In addition, the grain size is observed to be a function of cooling rate. EDS analysis performed on the deposits, where the elemental mapping revealed long chains of Nb-rich phases at the interdendritic regions. The microhardness measurements done using Vickers indentation method show a minimal variation with process parameters; the hardness followed a linear relationship with the reciprocal square root of grain width. [ABSTRACT FROM AUTHOR] |
|---|---|
| ISSN: | 10426914 |
| DOI: | 10.1080/10426914.2021.2006219 |
