About Fluence and Process Parameters on Maraging Steel Processed by Selective Laser Melting: Do They Convey the Same Information?

In this paper the influence of process parameters and fluence on mechanical properties of maraging steel in Selective Laser Melting (SLM) is studied. The results of the present work show that there exists a steady region of process parameters where fluence conveys all the information required to des...

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Bibliographic Details
Published in:International journal of precision engineering and manufacturing 2018-12, Vol.19 (12), p.1873-1884
Main Authors: Cacace, Stefania, Semeraro, Quirico
Format: Article
Language:English
Subjects:
Density
Engineering
Experimentation
Fluence
Industrial and Production Engineering
Laser beam melting
Maraging steels
Materials Science
Mechanical properties
Optimality criteria
Optimization
Parameter estimation
Process parameters
Productivity
Rapid prototyping
Regression models
Regular Paper
Tensile properties
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Summary:In this paper the influence of process parameters and fluence on mechanical properties of maraging steel in Selective Laser Melting (SLM) is studied. The results of the present work show that there exists a steady region of process parameters where fluence conveys all the information required to describe and predict density and tensile properties. We also show that in this region of the parameters, the choice of process parameters can be carried out considering other optimality criteria such as productivity, rather than maximization of density. To pursue this objective, a V-Alphabetical optimal design with fixed fluence levels was specifically designed for the experimentation. The used fluence levels and the corresponding process parameter combinations were tested on an industrial SLM system. To compare the informative content of fluence and the process parameters, two regression equation were estimated from experimental results for part density and tensile properties. The comparison of the regression models showed that the predictive ability of fluence and process parameters in the steady region is the same, however fluence allowed to obtain a higher precision. In conclusion, based on the experimental conditions studied, new process parameters are suggested using a productivity-based criteria.
ISSN:2234-7593
2005-4602
DOI:10.1007/s12541-018-0204-y