Fatigue resistance of the binder jet printed 17-4 precipitation hardened martensitic stainless steel
The unnotched fatigue behavior of the 17-4 PH martensitic (α’) stainless steel, additively manufactured using the binder jet printing technique (BJP), with varying porosity levels and in two different aging conditions are investigated and are compared to that of the conventionally manufactured (CM)...
Saved in:
Main Authors: | , , , , , |
---|---|
Other Authors: | |
Format: | Article |
Language: | English |
Published: |
2023
|
Subjects: | |
Online Access: | https://hdl.handle.net/10356/169055 |
Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
Institution: | Nanyang Technological University |
Language: | English |
id |
sg-ntu-dr.10356-169055 |
---|---|
record_format |
dspace |
spelling |
sg-ntu-dr.10356-1690552023-11-03T06:46:11Z Fatigue resistance of the binder jet printed 17-4 precipitation hardened martensitic stainless steel Radhakrishnan, Jayaraj Kumar, Punit Gan, Soo Seong Bryl, Alexis McKinnell, Jim Ramamurty, Upadrasta School of Mechanical and Aerospace Engineering Institute of Materials Research and Engineering, A*STAR HP-NTU Digital Manufacturing Corporate Lab Engineering::Mechanical engineering Binder Jet Printing Mechanical Properties The unnotched fatigue behavior of the 17-4 PH martensitic (α’) stainless steel, additively manufactured using the binder jet printing technique (BJP), with varying porosity levels and in two different aging conditions are investigated and are compared to that of the conventionally manufactured (CM) alloy. As expected, fatigue strength is enhanced by the reduction in porosity, with hot isostatic pressing of the BJP alloy resulting in a fatigue strength that is similar to the CM alloy. Over-aging of the alloy improves its fatigue resistance further, which is caused by an enhancement in the threshold stress intensity factor range for fatigue crack initiation. These variations are rationalized by recourse to the analysis of the microstructure-crack interactions. It was found that the combination of plasticity induced crack closure mechanisms and transformation induced plasticity are dominant at the fatigue crack tip of the over-aged alloy. Fracture mechanics-based Kitagawa and Takahashi diagrams were utilized to illustrate the significance of pore size on the unnotched fatigue resistance of BJP 17-4 PH alloys. These results are discussed in terms of designing alloy fabrication using BJP specifically for cyclic loading conditions. Agency for Science, Technology and Research (A*STAR) National Research Foundation (NRF) Part of this research was conducted in collaboration with HP Inc. and was supported by National Research Foundation (NRF) Singapore and the Singapore Government through the Industry Alignment FundIndustry Collaboration Projects Grant (I1801E0028). The authors acknowledge the support of the HP-NTU digital manufacturing lab at NTU. UR acknowledges funding for ‘Structural Metals and Alloys Programme’ under RIE-2020 from A*Star, Singapore. 2023-06-27T08:28:11Z 2023-06-27T08:28:11Z 2023 Journal Article Radhakrishnan, J., Kumar, P., Gan, S. S., Bryl, A., McKinnell, J. & Ramamurty, U. (2023). Fatigue resistance of the binder jet printed 17-4 precipitation hardened martensitic stainless steel. Materials Science and Engineering: A, 865, 144451-. https://dx.doi.org/10.1016/j.msea.2022.144451 0921-5093 https://hdl.handle.net/10356/169055 10.1016/j.msea.2022.144451 2-s2.0-85146147223 865 144451 en I1801E0028 Materials Science and Engineering: A © 2022 Elsevier B.V. All rights reserved. |
institution |
Nanyang Technological University |
building |
NTU Library |
continent |
Asia |
country |
Singapore Singapore |
content_provider |
NTU Library |
collection |
DR-NTU |
language |
English |
topic |
Engineering::Mechanical engineering Binder Jet Printing Mechanical Properties |
spellingShingle |
Engineering::Mechanical engineering Binder Jet Printing Mechanical Properties Radhakrishnan, Jayaraj Kumar, Punit Gan, Soo Seong Bryl, Alexis McKinnell, Jim Ramamurty, Upadrasta Fatigue resistance of the binder jet printed 17-4 precipitation hardened martensitic stainless steel |
description |
The unnotched fatigue behavior of the 17-4 PH martensitic (α’) stainless steel, additively manufactured using the binder jet printing technique (BJP), with varying porosity levels and in two different aging conditions are investigated and are compared to that of the conventionally manufactured (CM) alloy. As expected, fatigue strength is enhanced by the reduction in porosity, with hot isostatic pressing of the BJP alloy resulting in a fatigue strength that is similar to the CM alloy. Over-aging of the alloy improves its fatigue resistance further, which is caused by an enhancement in the threshold stress intensity factor range for fatigue crack initiation. These variations are rationalized by recourse to the analysis of the microstructure-crack interactions. It was found that the combination of plasticity induced crack closure mechanisms and transformation induced plasticity are dominant at the fatigue crack tip of the over-aged alloy. Fracture mechanics-based Kitagawa and Takahashi diagrams were utilized to illustrate the significance of pore size on the unnotched fatigue resistance of BJP 17-4 PH alloys. These results are discussed in terms of designing alloy fabrication using BJP specifically for cyclic loading conditions. |
author2 |
School of Mechanical and Aerospace Engineering |
author_facet |
School of Mechanical and Aerospace Engineering Radhakrishnan, Jayaraj Kumar, Punit Gan, Soo Seong Bryl, Alexis McKinnell, Jim Ramamurty, Upadrasta |
format |
Article |
author |
Radhakrishnan, Jayaraj Kumar, Punit Gan, Soo Seong Bryl, Alexis McKinnell, Jim Ramamurty, Upadrasta |
author_sort |
Radhakrishnan, Jayaraj |
title |
Fatigue resistance of the binder jet printed 17-4 precipitation hardened martensitic stainless steel |
title_short |
Fatigue resistance of the binder jet printed 17-4 precipitation hardened martensitic stainless steel |
title_full |
Fatigue resistance of the binder jet printed 17-4 precipitation hardened martensitic stainless steel |
title_fullStr |
Fatigue resistance of the binder jet printed 17-4 precipitation hardened martensitic stainless steel |
title_full_unstemmed |
Fatigue resistance of the binder jet printed 17-4 precipitation hardened martensitic stainless steel |
title_sort |
fatigue resistance of the binder jet printed 17-4 precipitation hardened martensitic stainless steel |
publishDate |
2023 |
url |
https://hdl.handle.net/10356/169055 |
_version_ |
1781793774800732160 |