Abstract
This article describes the ability to use laser-blown powder deposition to repair high γ’ IN-100 superalloy gas turbine components. The influence of various process conditions on the ability to make crack-free IN-100 deposits over surrogate high γ' alloys was investigated to identify cracking mechanisms in the deposit and heat-affected zones (HAZs). The various crack formation mechanisms, such as solidification cracking and liquation cracking, were evaluated using multiscale characterization and numerical simulation. The cracking in the deposit region was predominantly solidification cracking, while those observed in the HAZ were liquation cracking. The results showed that controlling thermally induced residual stresses is the key to eliminating cracking, and the optimum preheat temperature was determined. The results were then contrasted with those in published literature and an approach to effectively repair hot section parts was presented.
| Original language | English |
|---|---|
| Pages (from-to) | 313-S and 327-S |
| Journal | Welding Journal |
| Volume | 102 |
| Issue number | 12 |
| DOIs | |
| State | Published - Dec 2023 |
Funding
*This manuscript has been authored by UT-Battelle LLC, under Contract No. DE-AC05-00OR22725 with the U.S. Department of Energy. The United States Government retains and the publisher, by accepting the article for publication, acknowledges that the United States Government retains a nonexclusive, paid-up, irrevocable, worldwide license to publish or reproduce the published form of this manuscript, or allow others to do so, for United States Government purposes. The Department of Energy will provide public access to these results of federally sponsored research in accordance with the DOE Public Access Plan (energy.gov/doe-public-access-plan). The authors would like to acknowledge the U.S. Department of Energy, Office of Energy Efficiency and Renewable Energy (EERE), Advanced Manufacturing Office Technical Collaborations program. This research was a result of the collaboration between Oak Ridge National Laboratory (ORNL) and Delta Tech Ops. This CRADA/NFE-17-06791 was conducted as a technical collaboration project within the ORNL Manufacturing Demonstration Facility (MDF) sponsored by the U.S. Department of Energy Advanced Manufacturing Office (CPS Agreement Number 24761). Opportunities for MDF technical collaborations are listed in the announcement “Manufacturing Demonstration Facility: Technology Collaborations for U.S. Manufacturers in Advanced Manufacturing and Materials Technologies” posted at sam.gov/ opp/eaf639a7ff90caae05bec2c5bbd44794/view. The goal of technical collaborations is to engage industry partners to participate in short-term, collaborative projects within the MDF to assess the applicability of new energy-efficient manufacturing technologies. Research sponsored by the U.S. Department of Energy, EERE, Advanced Manufacturing Office, under contract DE-AC05-00OR22725 with UT-Battelle LLC. The authors would also like to acknowledge Tom Geer and Victoria Cox for preparing the samples for metallographic examination. On behalf of all authors, the corresponding author states that there is no conflict of interest.
Keywords
- Additive Manufacturing
- Cladding
- Ni Alloys
- Numerical Analysis
- Weldability
