Planning the process parameters for the direct metal deposition of functionally graded parts based on mathematical models

2018 ◽  
Vol 31 ◽  
pp. 56-71 ◽  
Author(s):  
Jingyuan Yan ◽  
Ilenia Battiato ◽  
Georges M. Fadel
Keyword(s):  
Mathematical Models ◽  
Process Parameters ◽  
Metal Deposition ◽  
Functionally Graded ◽  
Direct Metal Deposition

Thermal Analysis and Verification for Direct Metal Deposition of 0Cr18Ni9 Stainless Steel

2019 ◽  
Author(s):  
Jin Wang ◽  
Jing Shi ◽  
Yi Wang ◽  
Yun Bai
Keyword(s):  
Stainless Steel ◽  
Additive Manufacturing ◽  
Temperature Distribution ◽  
Process Parameters ◽  
Thermal Stresses ◽  
Infrared Camera ◽  
Dimensional Accuracy ◽  
Metal Deposition ◽  
Direct Metal Deposition ◽  
Heating And Cooling

Abstract Due to rapid cyclic heating and cooling in metal additive manufacturing processes, such as selective laser melting (SLM) and direct metal deposition (DMD), large thermal stresses will form and this may lead to the loss of dimensional accuracy or even cracks. The integration of numerical analysis and experimental validation provides a powerful tool that allows the prediction of defects, and optimization of the component design and the additive manufacturing process parameters. In this work, a numerical simulation on the thermal process of DMD of 0Cr18Ni9 stainless steel is conducted. The simulation is based on the finite volume method (FVM). An in-house code is developed, and it is able to calculate the temperature distribution dynamically. The model size is 30mm × 30mm × 10.5mm, containing 432,000 cells. A DMD experiment on the material with the same configuration and process parameters is also carried out, during which an infrared camera is adopted to obtain the surface temperature distribution continuously, and thermocouples are embedded in the baseplate to record the temperature histories. It is found that the numerical results agree with the experimental results well.

Tensile strength of functionally graded and wafer layered structures produced by direct metal deposition

2014 ◽  
Vol 20 (5) ◽  
pp. 360-368 ◽  
Author(s):  
Mehdi Soodi ◽  
Syed H. Masood ◽  
Milan Brandt
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Tensile Tests ◽  
Layered Structures ◽  
Metal Deposition ◽  
Functionally Graded ◽  
Direct Metal Deposition ◽  
Engineering Applications ◽  
Diverse Range ◽  
Content Type

Purpose – This paper aims to investigate the changes in tensile properties of novel functionally graded materials (FGMs) and wafer structures created by direct metal deposition (DMD) additive manufacturing (AM) technology. Design/methodology/approach – Laser-assisted DMD was used to create two innovative sets of metallic structures – the functionally graded and wafer-layered structures – using pairs of six different engineering alloys in different combinations. These alloys were selected due to their high popularity within a diverse range of industries and engineering applications. The laser-assisted DMD was selected as a suitable technique to create these complex structures because of its capability to deposit more than one alloy powder at a time. After creation of these structures, their tensile strength was tested in a series of tensile tests and the results were compared with those of single alloy samples. Findings – It was observed that the mechanical properties of FGMs and wafer structure samples were clearly different from those of the single alloy samples, a fact which creates a whole pool of opportunities for development of new materials or structures with desired mechanical properties that cannot be achieved in single alloy parts. Originality/value – The study demonstrates the application of the DMD process to produce unique structures and materials, which would be high in demand in engineering applications, where metallic parts are exposed to high loads and where excessive tensile stresses may adversely affect the performance of such parts.

Parametric study of development of Inconel-steel functionally graded materials by laser direct metal deposition

2014 ◽  
Vol 54 ◽  
pp. 531-538 ◽  
Author(s):  
Kamran Shah ◽  
Izhar ul Haq ◽  
Ashfaq Khan ◽  
Shaukat Ali Shah ◽  
Mushtaq Khan ◽  
...  
Keyword(s):  
Functionally Graded Materials ◽  
Parametric Study ◽  
Metal Deposition ◽  
Functionally Graded ◽  
Direct Metal Deposition ◽  
Graded Materials
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