Influence of ductility on fracture in tensile testing of cold gas sprayed deposits
Publication date
2023-05-17
Document type
Forschungsartikel
Author
Huang, Chunjie
Gieseler, C.-P.
Schulze, Matthias
Organisational unit
Publisher
Springer
Series or journal
Journal of thermal spray technology
ISSN
Periodical volume
32
Periodical issue
6
First page
1780
Last page
1795
Peer-reviewed
✅
Part of the university bibliography
✅
Language
English
Keyword
Additive manufacturing
Cold spraying
Layer ductility
Mechanical properties
Tensile testing
Abstract
Cold gas spraying nowadays receives much interest for additive manufacturing due to its high deposition rate. Associated structural applications define high requirements regarding mechanical properties and failure tolerances. Up to present, micro-flat tensile (MFT) or tubular coating tensile (TCT) tests are well-established for determining deposit strengths. Due to particular stress states during testing, both provide slightly different information. While MFT tests can provide information on strain and ductility, stress concentration in TCT tests requires to apply a notch factor for calculating the ultimate tensile strength. Here, we suggest that a suitable combination of both tests can provide additional information about tolerances against local stress concentrations in crack initiation and growth. Taking titanium and copper as model systems, results from MFT and TCT tests are evaluated over a wide range of spray parameter sets into regimes that allow for high deposit qualities, even reaching certain ductility. The correlation between the results reveals that the derived stress concentration sensitivity depends on the deposit quality and could eventually decrease to unity. In turn, the correlation to respective strain to failure data can supply information on underlying deformation mechanisms. These preliminary results thus provide strategies for tuning deposit toughness and give prerequisites for quality forecasts.
Description
This article is an invited paper selected from presentations at the 2022 International Thermal Spray Conference, held May 4–6, 2022, in Vienna, Austria, and has been expanded from the original presentation.
This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.
Version
Published version
Access right on openHSU
Metadata only access
Open Access Funding
Springer Nature (DEAL)