Thermal Analysis in the Technological “Step” Test of H282 Nickel Alloy
Superalloys show a good combination of mechanical strength and resistance to surface degradation under the influence of chemically active environments at high temperature. They are characterized by very high heat and creep resistance. Their main application is in gas turbines, chemical industry, and...
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| Format: | Article |
| Language: | English |
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Polish Academy of Sciences
2015-03-01
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| Series: | Archives of Foundry Engineering |
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| Online Access: | http://www.degruyter.com/view/j/afe.2015.15.issue-1/afe-2015-0016/afe-2015-0016.xml?format=INT |
| _version_ | 1797762973887889408 |
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| author | Pirowski Z. |
| author_facet | Pirowski Z. |
| author_sort | Pirowski Z. |
| collection | DOAJ |
| description | Superalloys show a good combination of mechanical strength and resistance to surface degradation under the influence of chemically active environments at high temperature. They are characterized by very high heat and creep resistance. Their main application is in gas turbines, chemical industry, and in all those cases where resistance to creep and the aggressive corrosion environment is required. Modern jet engines could never come into use if not for progress in the development of superalloys. Superalloys are based on iron, nickel and cobalt. The most common and the most interesting group includes superalloys based on nickel. They carry loads at temperatures well in excess of the eighty percent of the melting point. This group includes the H282 alloy, whose nominal chemical composition is as follows (wt%): Ni - base, Fe - max. 1.5%, Al - 1.5% Ti - 2.1%, C - 0.06% Co - 10% Cr - 20% Mo - 8.5%. This study shows the results of thermal analysis of the H282 alloy performed on a cast step block with different wall thickness. Using the results of measurements, changes in the temperature of H282 alloy during its solidification were determined, and the relationship dT / dt = f (t) was derived. The results of the measurements taken at different points in the cast step block allowed identifying a number of thermal characteristics of the investigated alloy and linking the size of the dendrites formed in a metal matrix (DAS) with the thermal effect of solidification. It was found that the time of solidification prolonged from less than ome minute at 10 mm wall thickness to over seven minutes at the wall thickness of 44 mm doubled the value of DAS. |
| first_indexed | 2024-03-12T19:34:57Z |
| format | Article |
| id | doaj.art-d834b481eb9c45e3a7f087fd411f9da0 |
| institution | Directory Open Access Journal |
| issn | 2299-2944 |
| language | English |
| last_indexed | 2024-03-12T19:34:57Z |
| publishDate | 2015-03-01 |
| publisher | Polish Academy of Sciences |
| record_format | Article |
| series | Archives of Foundry Engineering |
| spelling | doaj.art-d834b481eb9c45e3a7f087fd411f9da02023-08-02T04:15:06ZengPolish Academy of SciencesArchives of Foundry Engineering2299-29442015-03-01151879210.1515/afe-2015-0016afe-2015-0016Thermal Analysis in the Technological “Step” Test of H282 Nickel AlloyPirowski Z.0Department of Ferrous Alloys, Foundry Research Institute, ul. Zakopiańska 73, 30-418 Cracow, PolandSuperalloys show a good combination of mechanical strength and resistance to surface degradation under the influence of chemically active environments at high temperature. They are characterized by very high heat and creep resistance. Their main application is in gas turbines, chemical industry, and in all those cases where resistance to creep and the aggressive corrosion environment is required. Modern jet engines could never come into use if not for progress in the development of superalloys. Superalloys are based on iron, nickel and cobalt. The most common and the most interesting group includes superalloys based on nickel. They carry loads at temperatures well in excess of the eighty percent of the melting point. This group includes the H282 alloy, whose nominal chemical composition is as follows (wt%): Ni - base, Fe - max. 1.5%, Al - 1.5% Ti - 2.1%, C - 0.06% Co - 10% Cr - 20% Mo - 8.5%. This study shows the results of thermal analysis of the H282 alloy performed on a cast step block with different wall thickness. Using the results of measurements, changes in the temperature of H282 alloy during its solidification were determined, and the relationship dT / dt = f (t) was derived. The results of the measurements taken at different points in the cast step block allowed identifying a number of thermal characteristics of the investigated alloy and linking the size of the dendrites formed in a metal matrix (DAS) with the thermal effect of solidification. It was found that the time of solidification prolonged from less than ome minute at 10 mm wall thickness to over seven minutes at the wall thickness of 44 mm doubled the value of DAS.http://www.degruyter.com/view/j/afe.2015.15.issue-1/afe-2015-0016/afe-2015-0016.xml?format=INTNickel alloysSuperalloysTechnological “step” testThermal analysis |
| spellingShingle | Pirowski Z. Thermal Analysis in the Technological “Step” Test of H282 Nickel Alloy Archives of Foundry Engineering Nickel alloys Superalloys Technological “step” test Thermal analysis |
| title | Thermal Analysis in the Technological “Step” Test of H282 Nickel Alloy |
| title_full | Thermal Analysis in the Technological “Step” Test of H282 Nickel Alloy |
| title_fullStr | Thermal Analysis in the Technological “Step” Test of H282 Nickel Alloy |
| title_full_unstemmed | Thermal Analysis in the Technological “Step” Test of H282 Nickel Alloy |
| title_short | Thermal Analysis in the Technological “Step” Test of H282 Nickel Alloy |
| title_sort | thermal analysis in the technological step test of h282 nickel alloy |
| topic | Nickel alloys Superalloys Technological “step” test Thermal analysis |
| url | http://www.degruyter.com/view/j/afe.2015.15.issue-1/afe-2015-0016/afe-2015-0016.xml?format=INT |
| work_keys_str_mv | AT pirowskiz thermalanalysisinthetechnologicalsteptestofh282nickelalloy |