Instytut Podstawowych Problemów Techniki
Polskiej Akademii Nauk

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Urvashi Gunputh


Ostatnie publikacje
1.  Kopeć M., Gunputh U., Williams G., Macek W., Kowalewski Z.L., Wood P., Fatigue Damage Evolution in SS316L Produced by Powder Bed Fusion in Different Orientations with Reused Powder Feedstock, EXPERIMENTAL MECHANICS, ISSN: 0014-4851, DOI: 10.1007/s11340-024-01118-1, pp.1-16, 2024

Streszczenie:
Background

Metal Laser Powder Bed Fusion Melting (LPBF-M) is considered economically viable and environmentally sustainable because of the possibility of reusing the residual powder feedstock leftover in the build chamber after a part build is completed. There is however limited information on the fatigue damage development of LPBF-M samples made from reused feedstock.
Objective

In this paper, the stainless steel 316 L (SS316L) powder feedstock was examined and characterised after 25 reuses, following which the fatigue damage development of material samples made from the reused powder was assessed.
Methods

The suitability of the powder to LPBF-M technology was evaluated by microstructural observations and measurements of Hall flow, apparent and tapped density as well as Carr’s Index and Hausner ratio. LPBF-M bar samples in three build orientations (Z – vertical, XY – horizontal, ZX – 45° from the build plate) were built for fatigue testing. They were then subjected to fatigue testing under load control using full tension and compression cyclic loading and stress asymmetry coefficient equal to -1 in the range of stress amplitude from ± 300 MPa to ± 500 MPa.
Results

Samples made from reused powder (25 times) in the LPBF-M process exhibited similar fatigue performance to fresh unused powder although a lower ductility for vertical samples was observed during tensile testing. Printing in horizontal (XY) and diagonal (ZX) directions, with reused powder, improved the service life of the SS316L alloy in comparison to the vertical (Z).
Conclusions

Over the 25 reuses of the powder feedstock there was no measurable difference in the flowability between the fresh (Hall Flow: 21.4 s/50 g) and reused powder (Hall Flow: 20.6 s/50 g). This confirms a uniform and stable powder feeding process during LPBF-M for both fresh and reused powder. The analysis of fatigue damage parameter, D, concluded cyclic plasticity and ratcheting to be the main mechanism of damage.

Słowa kluczowe:
SS316L ,Stainless steel,Fatigue ,Additive manufacturing,Laser Powder Bed Fusion Melting (LPBF-M)

Afiliacje autorów:
Kopeć M. - IPPT PAN
Gunputh U. - inna afiliacja
Williams G. - University of Derby (GB)
Macek W. - inna afiliacja
Kowalewski Z.L. - IPPT PAN
Wood P. - University of Derby (GB)
100p.
2.  Kopeć M., Gunputh U., Macek W., Kowalewski Z.L., Wood P., Orientation effects on the fracture behaviour of additively manufactured stainless steel 316L subjected to high cyclic fatigue, Theoretical and Applied Fracture Mechanics, ISSN: 0167-8442, DOI: 10.1016/j.tafmec.2024.104287, pp.1-20, 2024

Streszczenie:
In this paper, stainless steel 316L (SS316L) bars were additively manufactured (AM) in three orientations (Z – vertical, XY – horizontal, ZX45 – midway between vertical and horizontal) by using the Laser Powder Bed Fusion Melting (LPBF-M) method. The AM specimens were subjected to load control fatigue testing under full tension and compression (R = -1) at stress amplitudes ±350, ±400 and ±450 MPa. The XY and ZX45 printing orientations were found to significantly improve service life. Although similar strain response was found for each orientation when the same stress amplitude was applied, slightly different fracture mechanisms were identified during the post-mortem surface observations.

Słowa kluczowe:
SS316L,stainless steel,fatigue,additive manufacturing,Laser Powder Bed Fusion Melting (LPBF-M)

Afiliacje autorów:
Kopeć M. - IPPT PAN
Gunputh U. - inna afiliacja
Macek W. - inna afiliacja
Kowalewski Z.L. - IPPT PAN
Wood P. - University of Derby (GB)
100p.

Prace konferencyjne
1.  Libura T., Sienkiewicz J., Nowak Z., Kowalewski Z., Rusinek A., Voyiadjis G.Z., Gunputh U., Wood P., The influence of build parameters on the collapse behaviour of a highly porous random open-cell lattice 3D printed in IN718 alloy, DynaMAT'2024, The 14 international conference of DYNAMIC BEHAVIOUR OF MATERIALS AND ITS APPLICATIONS IN INDUSTRIAL PROCESSES, 2024-10-16/10-18, La Marsa (TN), pp.1-2, 2024

Streszczenie:
Additive manufacturing (AM) is revolutionizing production with its ability to rapidly create complex designs while minimizing material waste. The influence of the SLM parameters on mechanical properties of two sets of open cell lattices (Set A and Set B) made of IN718 was investigated. The purpose of using the modified parameters was to reduce the cost/time of manufacturing as well as to reduce microporosity in ligaments by increased exposure time (reduced laser scanning speed) or higher energy density based on increased exposure time. The researchers investigate ligament deformation and collapse in porous lattices, its impact on overall behavior, and how microstructure influences hardening under varying strain rates.

Słowa kluczowe:
highly porous random open-cell lattice, additive manufacturing, direct impact Hopkinson pressure bar technique, Inconel 718

Afiliacje autorów:
Libura T. - IPPT PAN
Sienkiewicz J. - Military University of Technology (PL)
Nowak Z. - IPPT PAN
Kowalewski Z. - IPPT PAN
Rusinek A. - IPPT PAN
Voyiadjis G.Z. - inna afiliacja
Gunputh U. - inna afiliacja
Wood P. - University of Derby (GB)

Abstrakty konferencyjne
1.  Libura T., Sienkiewicz J., Nowak Z., Kowalewski Z.L., Rusinek A., Voyiadjis G.Z., Gunputh U., Wood P., CHARACTERISATION OF THE COLLAPSE BEHAVIOUR IN 3D PRINTED IN718 ALLOY UNDER A RANGE OF STRESS STATES AND STRAIN RATES, DAS 2024, 40th DANUBIA-ADRIA SYMPOSIUM on Advances in Experimental Mechanics, 2024-09-24/09-27, Gdańsk (PL), pp.1-2, 2024
2.  Wood P., Gunputh U., Williams G., Carter W., Boud F., Bahi S., Rusinek A., Kowalewski Z.L., Nowak Z., Libura T., Vojiadjis G.Z., Diaz-Alvare J., Miguelez M.H., SELECTIVE LASER MELTING OF A HIGH PRECISION TURBOMACHINERY APPLICATION IN IN718 ALLOY, ICEM, 19th International Conference on Experimental Mechanics, 2022-07-17/07-21, Kraków (PL), pp.34-35, 2022

Kategoria A Plus

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