An atom probe perspective on phase separation and precipitation in duplex stainless steels
Three-dimensional chemical imaging of Fe-Cr alloys showing Fe-rich (α)/Cr-rich (α’)phase separation is reported using atom probe tomography techniques. The extent of phase separation, i.e., amplitude and wavelength, has been quantitatively assessed using the Langer -Baron-Miller, proximity histogra...
| Egile Nagusiak: | , , , , , |
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| Formatua: | Journal article |
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Institute of Physics
2016
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| _version_ | 1826258146667003904 |
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| author | Haley, D Garfinkel, D Tucker, J Young, G Poplawsky, J Guo, W |
| author_facet | Haley, D Garfinkel, D Tucker, J Young, G Poplawsky, J Guo, W |
| author_sort | Haley, D |
| collection | OXFORD |
| description | Three-dimensional chemical imaging of Fe-Cr alloys showing Fe-rich (α)/Cr-rich (α’)phase separation is reported using atom probe tomography techniques. The extent of phase separation, i.e., amplitude and wavelength, has been quantitatively assessed using the Langer -Baron-Miller, proximity histogram, and autocorrelation function methods for two separate Fe-Cr alloys, designated 2101 and 2205. Although the 2101 alloy possesses a larger wavelength and amplitude after annealing at 427° C for 100-10,000 hrs, it exhibits a lower hardness than the 2205 alloy. In addition to this phase separation, ultra-fine Ni-Mn-Si-Cu-rich G-phase precipitates form at the α/α’ interfaces in both alloys. For the 2101 alloy, Cu clusters act to form a nucleus, around which a Ni-Mn-Si shell develops during the precipitation process. For the 2205 alloy, the Ni and Cu atoms enrich simultaneously and no core-shell chemical distribution was found. This segregation phenomenon may arise from the exact Ni/Cu ratio inside the ferrite. After annealing for 10,000 hrs, the number density of G-phase within the 2205 alloy was found to be roughly one order of magnitude higher than in the 2101 alloy. The G-phase precipitates have an additional deleterious effect on the thermal embrittlement, as evaluated by the Ashby-Orowan equation, which explains the discrepancy between the hardness and the rate of phase separation with respect to annealing time. |
| first_indexed | 2024-03-06T18:29:25Z |
| format | Journal article |
| id | oxford-uuid:0921dfc9-bd19-4818-8535-6b5f081b0ee0 |
| institution | University of Oxford |
| last_indexed | 2024-03-06T18:29:25Z |
| publishDate | 2016 |
| publisher | Institute of Physics |
| record_format | dspace |
| spelling | oxford-uuid:0921dfc9-bd19-4818-8535-6b5f081b0ee02022-03-26T09:16:36ZAn atom probe perspective on phase separation and precipitation in duplex stainless steelsJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:0921dfc9-bd19-4818-8535-6b5f081b0ee0Symplectic Elements at OxfordInstitute of Physics2016Haley, DGarfinkel, DTucker, JYoung, GPoplawsky, JGuo, WThree-dimensional chemical imaging of Fe-Cr alloys showing Fe-rich (α)/Cr-rich (α’)phase separation is reported using atom probe tomography techniques. The extent of phase separation, i.e., amplitude and wavelength, has been quantitatively assessed using the Langer -Baron-Miller, proximity histogram, and autocorrelation function methods for two separate Fe-Cr alloys, designated 2101 and 2205. Although the 2101 alloy possesses a larger wavelength and amplitude after annealing at 427° C for 100-10,000 hrs, it exhibits a lower hardness than the 2205 alloy. In addition to this phase separation, ultra-fine Ni-Mn-Si-Cu-rich G-phase precipitates form at the α/α’ interfaces in both alloys. For the 2101 alloy, Cu clusters act to form a nucleus, around which a Ni-Mn-Si shell develops during the precipitation process. For the 2205 alloy, the Ni and Cu atoms enrich simultaneously and no core-shell chemical distribution was found. This segregation phenomenon may arise from the exact Ni/Cu ratio inside the ferrite. After annealing for 10,000 hrs, the number density of G-phase within the 2205 alloy was found to be roughly one order of magnitude higher than in the 2101 alloy. The G-phase precipitates have an additional deleterious effect on the thermal embrittlement, as evaluated by the Ashby-Orowan equation, which explains the discrepancy between the hardness and the rate of phase separation with respect to annealing time. |
| spellingShingle | Haley, D Garfinkel, D Tucker, J Young, G Poplawsky, J Guo, W An atom probe perspective on phase separation and precipitation in duplex stainless steels |
| title | An atom probe perspective on phase separation and precipitation in duplex stainless steels |
| title_full | An atom probe perspective on phase separation and precipitation in duplex stainless steels |
| title_fullStr | An atom probe perspective on phase separation and precipitation in duplex stainless steels |
| title_full_unstemmed | An atom probe perspective on phase separation and precipitation in duplex stainless steels |
| title_short | An atom probe perspective on phase separation and precipitation in duplex stainless steels |
| title_sort | atom probe perspective on phase separation and precipitation in duplex stainless steels |
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