Treatments and characterization techniques for bifilm induced casting defects: a systematic review and network mapping

Structural defects in casting such as gas porosity, micro-porosity, inclusions, and hot tears significantly deteriorate the mechanical properties. These defects originate predominantly because of the presence of bifilms in the liquid melt. By developing suitable treatments and assessment tests that...

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Bibliographic Details
Published in:Sadhana (Bangalore) 2024-12, Vol.50 (1)
Main Authors: Rajagopal, Varthini, Rajendran, Dinesh Kumar, Chinnachamy, Rajaganapathy
Format: Article
Language:English
Subjects:
Casting
Casting defects
Degassing
Engineering
Literature reviews
Magnesium base alloys
Mechanical properties
Network analysis
Nonmetallic inclusions
Porosity
Structural analysis
Tearing
Vibration analysis
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Summary:Structural defects in casting such as gas porosity, micro-porosity, inclusions, and hot tears significantly deteriorate the mechanical properties. These defects originate predominantly because of the presence of bifilms in the liquid melt. By developing suitable treatments and assessment tests that characterize the melt-cleanliness, bifilm contents can be drastically reduced and thereby casting defects can be eliminated. In this regard, this work presents a systematic literature review of 49 research articles on the degassing treatments and characterization techniques reported in the past decade literature for reducing the bifilm induced casting defects. A keyword co-occurrence network analysis is then developed to visualize the predominantly researched areas and future research directions in bifilm based casting defects domain. Some of the findings include (i) Rotary and ultrasonic degassing processes are preferred largely for eliminating porosity and a paradigm shift towards study of integrated mechanical vibration and ultrasonic degassing treatments with composite sonogram is observed. (ii) Under inclusion research domain, assessment methods that identify substantial non-metallic inclusions, submerged entrance nozzles that cause swirl patterns in liquid melt and the effects of various fluxes and foam filters on treating inclusions need attention. (iii) The constrained rod testing is predominately studied to characterize hot tear in Mg alloys with research focus shifting towards the development of in situ quantification of hot tearing susceptibility.
ISSN:0256-2499
0973-7677
DOI:10.1007/s12046-024-02648-z