X-Ray CT Investigation of Graded Ti-Ti64 Material Produced by Selective Laser Melting

2019 ◽  
Vol 822 ◽  
pp. 542-548
Author(s):  
Vadim Sufiiarov ◽  
Artem Kantyukov ◽  
Igor A. Polozov
Keyword(s):  
Computed Tomography ◽  
Selective Laser Melting ◽  
Hot Isostatic Pressing ◽  
Laser Melting ◽  
Raw Data ◽  
X Ray ◽  
Isostatic Pressing ◽  
Volume Graphics ◽  
X Ray Computed

This paper is devoted to the study of gradient samples of Ti-Ti64 material, manufactured by selective laser melting. The measurements of porosity, differences in densities are made with x-ray computed tomography for as-processed and after hot isostatic pressing samples. The raw data was processed using the software Volume Graphics and AVIZO. The porosity of the samples was studied and their sphericity was calculated.

Selective Laser Melting of Stainless Steel with Subsequent Processing

2020 ◽  
Vol 989 ◽  
pp. 845-849
Author(s):  
A.S. Raznoschikov ◽  
D.A. Kochuyev ◽  
Anna A. Voznesenskaya
Keyword(s):  
Stainless Steel ◽  
Phase Composition ◽  
Selective Laser Melting ◽  
Hot Isostatic Pressing ◽  
Phase Changes ◽  
Laser Melting ◽  
Metallographic Study ◽  
X Ray ◽  
Isostatic Pressing ◽  
Subsequent Processing

In this work we describe the results of selective laser melting of stainless steel. The obtained samples were processed by hot isostatic pressing. Metallographic study of samples obtained after selective laser melting and hot isostatic pressing procedure was conducted. Comparison of the structure of obtained samples and a significant decrease in porosity after hot isostatic pressing was registered. The results of the phase composition by X-ray diffractometry are presented. Identified significant structural and phase changes at the study of a surface of the obtained microsections of samples, and a change in the hardness of the samples were recorded.

Measurement of the Porosity of Additive-Manufactured Al-Cu Alloy Using X-Ray Computed Tomography

2016 ◽  
Vol 258 ◽  
pp. 448-451 ◽  
Author(s):  
Aneta Zatočilová ◽  
Tomáš Zikmund ◽  
Jozef Kaiser ◽  
David Paloušek ◽  
Daniel Koutný
Keyword(s):  
Computed Tomography ◽  
Additive Manufacturing ◽  
Selective Laser Melting ◽  
Dimensional Accuracy ◽  
Threshold Value ◽  
Processing Parameters ◽  
Laser Melting ◽  
X Ray ◽  
X Ray Computed ◽  
Metallic Parts

The additive manufacturing of metallic parts by means of selective laser melting is an emerging technology, the development of which is currently of great interest. The quality of the parts produced is evaluated mainly in terms of their mechanical properties, dimensional accuracy, and the homogeneity of the material. Because it is virtually impossible to produce parts without any internal porosity using powder-based additive manufacturing processes, measuring the porosity is critically important to optimizing the processing parameters. X-ray computed tomography is currently the only way used to measure the distribution of pores non-destructively and it can also measure the density and dimensional accuracy. Many studies have presented results of porosity measurements made using CT, but no standard methodology for the making of measurements and processing of data currently exists. The choice of parameters used for measurement and processing can have a significant impact on the results. This study focuses on the effect of voxel resolution on the resulting porosity number and discusses the possibilities for determining the threshold value for detecting pores. All the results presented in this study were obtained by analyzing the sample produced by selective laser melting technology from AlCu2Mg1.5Ni alloy.

Challenges Associated With the Quantitative Analysis of Ductile Damage Using X-Ray Computed Tomography

2018 ◽  
Author(s):  
Adam J. Cooper ◽  
Timothy L. Burnett ◽  
Olivia C. G. Tuck ◽  
Andrew H. Sherry
Keyword(s):  
Computed Tomography ◽  
Fracture Surface ◽  
Hot Isostatic Pressing ◽  
Ductile Failure ◽  
Compact Tension ◽  
Ductile Damage ◽  
Fracture Toughness Test ◽  
X Ray ◽  
X Ray Computed ◽  
Tension Fracture

We have recently reported on the mechanistic differences in ductile failure between stainless steel manufactured by hot isostatic pressing (HIP) and forging, from which it was established that the oxygen concentration must be properly controlled. As part of an ongoing investigation into the mechanics of ductile failure in novel HIP materials, X-ray CT has been employed as a tool to quantify and characterize the differences in ductile damage below the fracture surface of failed compact tension fracture toughness test specimens. Herein we report on some of the challenges associated with handling data relative to the fracture surface, which can extend far into the cores under investigation.

Hot isostatic pressing of IN718 components manufactured by selective laser melting

2017 ◽  
Vol 13 ◽  
pp. 93-102 ◽  
Author(s):  
W. Tillmann ◽  
C. Schaak ◽  
J. Nellesen ◽  
M. Schaper ◽  
M.E. Aydinöz ◽  
...  
Keyword(s):  
Selective Laser Melting ◽  
Hot Isostatic Pressing ◽  
Laser Melting ◽  
Isostatic Pressing
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