Damages On Laser Peening-Strengthened and Non-Strengthened Nimonic Specimens as Potential Causes of Crack Initiation and Fracture
No Thumbnail
Authors
Đorđević, BranislavČolić, Katarina
Petronić, Sanja
Mišković, Žarko
Tatić, Uroš
Sedmak, Aleksandar
Conference object (Published version)
Metadata
Show full item recordAbstract
In this paper, two types of specimens made of NIMONIC alloy were chosen for experimental investigation, one of which was laser peening-strengthened and one which was not. Nimonic is widely used for various workpieces in industry, for example in gas turbine engines, die casting inserts and cores, exhaust valves, etc. The laser shock peening offers a lot of advantages over the conventional methods using the laser beam as a tool, and a transparent and absorptive layer to increase the pressure and protect the material. The changes in surface topography are observed and analysed by microscopy, a profilometer and a microhardness tester. Some unwanted damages on their surfaces that can lead to crack initiation were observed and described along with dimensions, shapes and locations, as well as further influence on the potential crack initiation that could lead to their fracture. Aforementioned specimens were in shapes of thin plates with holes, and the reinforced specimens were strengthened by... laser shot peening method around the holes. Detailed displays of damages of both specimens are given, along with the results of roughness and hardness tests which are shown for both specimens. These two tests were performed near the damage presence in both cases. Results discussed in this paper can aid the understanding of in-service behaviour of the mechanical parts with surface damages, even of laser peening-strengthened materials.
Keywords:
Nimonic alloy / Thin plate specimen / LPS / Experimental investigation / Crack formationSource:
„International Conference of Experimental and Numerical Investigations and New Technologies“ CNN TECH 2020, 2019, 15-Funding / projects:
- Pressure equipment integrity under simultaneous effect of fatigue loading and temperature (RS-MESTD-Technological Development (TD or TR)-35011)
- Developed new methods for diagnosis and examination mechanical structures (RS-MESTD-Technological Development (TD or TR)-35040)
URI
http://cnntechno.com/docs/4_CNN_book_of_abstracts_CIP_Final.pdfhttps://machinery.mas.bg.ac.rs/handle/123456789/6248
Collections
Institution/Community
Inovacioni centarTY - CONF AU - Đorđević, Branislav AU - Čolić, Katarina AU - Petronić, Sanja AU - Mišković, Žarko AU - Tatić, Uroš AU - Sedmak, Aleksandar PY - 2019 UR - http://cnntechno.com/docs/4_CNN_book_of_abstracts_CIP_Final.pdf UR - https://machinery.mas.bg.ac.rs/handle/123456789/6248 AB - In this paper, two types of specimens made of NIMONIC alloy were chosen for experimental investigation, one of which was laser peening-strengthened and one which was not. Nimonic is widely used for various workpieces in industry, for example in gas turbine engines, die casting inserts and cores, exhaust valves, etc. The laser shock peening offers a lot of advantages over the conventional methods using the laser beam as a tool, and a transparent and absorptive layer to increase the pressure and protect the material. The changes in surface topography are observed and analysed by microscopy, a profilometer and a microhardness tester. Some unwanted damages on their surfaces that can lead to crack initiation were observed and described along with dimensions, shapes and locations, as well as further influence on the potential crack initiation that could lead to their fracture. Aforementioned specimens were in shapes of thin plates with holes, and the reinforced specimens were strengthened by laser shot peening method around the holes. Detailed displays of damages of both specimens are given, along with the results of roughness and hardness tests which are shown for both specimens. These two tests were performed near the damage presence in both cases. Results discussed in this paper can aid the understanding of in-service behaviour of the mechanical parts with surface damages, even of laser peening-strengthened materials. C3 - „International Conference of Experimental and Numerical Investigations and New Technologies“ CNN TECH 2020 T1 - Damages On Laser Peening-Strengthened and Non-Strengthened Nimonic Specimens as Potential Causes of Crack Initiation and Fracture SP - 15 UR - https://hdl.handle.net/21.15107/rcub_machinery_6248 ER -
@conference{ author = "Đorđević, Branislav and Čolić, Katarina and Petronić, Sanja and Mišković, Žarko and Tatić, Uroš and Sedmak, Aleksandar", year = "2019", abstract = "In this paper, two types of specimens made of NIMONIC alloy were chosen for experimental investigation, one of which was laser peening-strengthened and one which was not. Nimonic is widely used for various workpieces in industry, for example in gas turbine engines, die casting inserts and cores, exhaust valves, etc. The laser shock peening offers a lot of advantages over the conventional methods using the laser beam as a tool, and a transparent and absorptive layer to increase the pressure and protect the material. The changes in surface topography are observed and analysed by microscopy, a profilometer and a microhardness tester. Some unwanted damages on their surfaces that can lead to crack initiation were observed and described along with dimensions, shapes and locations, as well as further influence on the potential crack initiation that could lead to their fracture. Aforementioned specimens were in shapes of thin plates with holes, and the reinforced specimens were strengthened by laser shot peening method around the holes. Detailed displays of damages of both specimens are given, along with the results of roughness and hardness tests which are shown for both specimens. These two tests were performed near the damage presence in both cases. Results discussed in this paper can aid the understanding of in-service behaviour of the mechanical parts with surface damages, even of laser peening-strengthened materials.", journal = "„International Conference of Experimental and Numerical Investigations and New Technologies“ CNN TECH 2020", title = "Damages On Laser Peening-Strengthened and Non-Strengthened Nimonic Specimens as Potential Causes of Crack Initiation and Fracture", pages = "15", url = "https://hdl.handle.net/21.15107/rcub_machinery_6248" }
Đorđević, B., Čolić, K., Petronić, S., Mišković, Ž., Tatić, U.,& Sedmak, A.. (2019). Damages On Laser Peening-Strengthened and Non-Strengthened Nimonic Specimens as Potential Causes of Crack Initiation and Fracture. in „International Conference of Experimental and Numerical Investigations and New Technologies“ CNN TECH 2020, 15. https://hdl.handle.net/21.15107/rcub_machinery_6248
Đorđević B, Čolić K, Petronić S, Mišković Ž, Tatić U, Sedmak A. Damages On Laser Peening-Strengthened and Non-Strengthened Nimonic Specimens as Potential Causes of Crack Initiation and Fracture. in „International Conference of Experimental and Numerical Investigations and New Technologies“ CNN TECH 2020. 2019;:15. https://hdl.handle.net/21.15107/rcub_machinery_6248 .
Đorđević, Branislav, Čolić, Katarina, Petronić, Sanja, Mišković, Žarko, Tatić, Uroš, Sedmak, Aleksandar, "Damages On Laser Peening-Strengthened and Non-Strengthened Nimonic Specimens as Potential Causes of Crack Initiation and Fracture" in „International Conference of Experimental and Numerical Investigations and New Technologies“ CNN TECH 2020 (2019):15, https://hdl.handle.net/21.15107/rcub_machinery_6248 .