- Title
- On the surface and system performance of thermally sprayed carbide coatings produced under controlled residual stresses
- Creator
- Smith, Gregory M.; Gildersleeve, Edward J.; Luo, Xiao-Tao; Luzin, Vladimir; Sampath, Sanjay
- Relation
- Surface and Coatings Technology Vol. 387, Issue 15 April 2020, no. 125536
- Publisher Link
- http://dx.doi.org/10.1016/j.surfcoat.2020.125536
- Publisher
- Elsevier
- Resource Type
- journal article
- Date
- 2020
- Description
- System level evaluation of structurally integrated coatings is critical to understanding their abilities to sustain and tolerate loads experienced during operation. Residual stress is a specific coating quality that tends to be overlooked in generalized assessment, especially as it relates to a coating's integration into larger systems. Due to difficulties in residual stress measurement, more tangible and readily measured properties, such as hardness and wear behavior are favored in evaluation yet can also be misleading with regards to ultimate integrated performance. This study seeks to clarify the role of process induced residual stress through a systematic investigation of design relevant properties of carbide coatings subjected to controlled changes in chemistry and processing/deposition energies. Results from such coupling of coating and system level properties can lead to better overall coating integration in complex engineering systems. In this work, three different coating materials, Cr3C2-NiCr, WC-Co, and WC-CoCr have been deposited under intentionally different process conditions, resulting in variations to coating microstructures and residual stress states, as determined by the beam curvature method. The resulting coatings were subjected to a range of coating-level (hardness, wear, and corrosion) and system-level (composite strength and fatigue) property evaluation. Results indicate coatings deposited at higher energy levels that drove generation of greater resulting compressive residual stresses tended to show the best performance amongst all tested conditions under the described evaluation regime. However, these results were also a function of coating chemistry, coefficient of thermal expansion mismatch, and processing changes which influenced coating character.
- Subject
- thermal spray; coatings; carbides; mechanical properties; high-velocity, oxy-fuel (HVOF)
- Identifier
- http://hdl.handle.net/1959.13/1441347
- Identifier
- uon:41397
- Identifier
- ISSN:0257-8972
- Language
- eng
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