Study on Selective Laser Melting Forming Process of Cobalt Chromium Alloy

Due to the rapid melting and solidification mechanisms involved in selective laser melting (SLM), CoCrMo alloys fabricated by SLM differ from the cast form of the same alloy. In this study, the relationship between process parameters and the morphology and macromechanical properties of cobalt-chromium alloy micro-melting pools is discussed. By measuring the width and depth of the molten pool, a theoretical model of the molten pool is established, and the relationship between the laser power, the scanning speed, the scanning line spacing, and the morphology of the molten pool is determined. At the same time, this study discusses the relationship between laser energy and molding rate. Based on the above research, the optimal process for the laser melting of cobalt-chromium alloy in the selected area is obtained. These results will contribute to the development of biomedical CoCr alloys manufactured by SLM.

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Experimental Study on Density and Pore Defect of Cobalt-chromium Alloy Manufactured by Selective Laser Melting

IOP Conference Series Materials Science and Engineering ◽

10.1088/1757-899x/382/2/022082 ◽

2018 ◽

Vol 382 ◽

pp. 022082 ◽

Cited By ~ 2

Author(s):

C An ◽

J S Zhang ◽

Y M Zhang ◽

D X Lv ◽

L Ruan

Keyword(s):

Experimental Study ◽

Selective Laser Melting ◽

Chromium Alloy ◽

Cobalt Chromium ◽

Laser Melting ◽

Cobalt Chromium Alloy

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Rapid prediction of the relationship between processing parameters and molten pool during selective laser melting of cobalt-chromium alloy powder: simulation and experiment

Journal of Alloys and Compounds ◽

10.1016/j.jallcom.2021.162200 ◽

2021 ◽

pp. 162200

Author(s):

Jianneng Yin ◽

Wei Liu ◽

Yu Cao ◽

Lehui Zhang ◽

Jianhong Wang ◽

...

Keyword(s):

Molten Pool ◽

Alloy Powder ◽

Processing Parameters ◽

Chromium Alloy ◽

Cobalt Chromium ◽

Laser Melting ◽

Rapid Prediction ◽

Simulation And Experiment ◽

The Relationship ◽

Cobalt Chromium Alloy

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Finite Element Analysis of Porous Medical Grade Cobalt Chromium Alloy Structures Produced by Selective Laser Melting

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.1133.113 ◽

2016 ◽

Vol 1133 ◽

pp. 113-118

Author(s):

Saiful Anwar Che Ghani ◽

Wan Sharuzi Wan Harun ◽

Zahrul Adnan Mat Taib ◽

Fadzil Faisae Ab Rashid ◽

Ramli Mohd Hazlen ◽

...

Keyword(s):

Mechanical Properties ◽

Finite Element ◽

Selective Laser Melting ◽

Process Analysis ◽

Equivalent Stress ◽

Chromium Alloy ◽

Cobalt Chromium ◽

Laser Melting ◽

Cocr Alloy ◽

Medical Grade

The recent introduction of selective laser melting (SLM) for the processing of medical grade cobalt chromium (CoCr) alloy has led to a complex shape fabrication of porous custom CoCr alloy implants with controlled porosity to meet the requirements of the anatomy and functions at the region of implantation. This paper discusses finite element (FE) analysis and mechanical characterization of porous medical grade CoCr alloy in cubical structures with volume based porosity ranging between 60% and 80% produced using SLM rapid manufacturing process. Analysis by FE is considered beneficial to predict the effective mechanical properties of the porous structures manufactured by SLM due to minimization of the need for expensive and time consuming physical testing. Cellular structures modelling for fabrication with Direct Metal Laser Sintering machine were designed to vary between 60% and 80% to study the effect of structural variation on mechanical properties of the cellular porous structure. ANSYS 14.0 FE modelling software was used to predict the effective elastic modulus of the samples and comparisons were made with the experimental data. FE results show that with the material properties in the functions of porosities, minimum mesh size of 0.2 mm for triangular shape mesh and boundary as well as load conditions as applied in this study, agreement in equivalent stress, strain and deformation with the experimental results can be achieved to some extent. The technique for FE in this study can be used to investigate stress distribution in three dimensional model of real bone.

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