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Acoustic Emission (AE) Monitoring of Open Die and Closed Die Forging Processes of Al Alloy |
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| Authors: | C K Mukhopadhyay S Venugopal T Jayakumar S L Mannan Baldev Raj B Chatterji R Srinivasan V Gopalakrishnan G Madhusudan R S Tripathi |
| Affiliation: | a Indira Gandhi Center for Atomic Research, Kalpakkam, India b Foundry and Forge Division, Hindustan Aeronautics Limited, Bangalore, India |
| Abstract: | Acoustic emission (AE) generated during open die and closed die forging processes of Al alloy has been studied. AE generated during both types of the forging processes could be differentiated into three stages, namely, yielding of the workpiece material upon start of forging, intermediate deformation and filling of the die. The effect of lubrication on the AE generated during open die forging was also studied. This showed that AE increases with decreasing lubrication of the workpiece thus enabling AE to detect lubrication inadequacy/breakdown during the forging process. |
| Keywords: | Acoustic emission (AE) Al Alloy Closed die forging Die filling Dislocation avalanche Forming Friction Lubrication Monitoring Nondestructive technique Open die forging Peak amplitude distribution Piezoelectric Sliding Yielding |
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