Fatigue Damage Assessment in AL6XN Stainless Steel Based on the Strain-Hardening Exponent <i>n</i>-Value
The fatigue life curve was determined for the AL6XN stainless steel under strain-controlled Low Cycle Fatigue (LCF) tests. Additionally, a specific number of loading cycles were applied to new specimens made from the same AL6XN alloy batch to set an Accumulated Fatigue Damage (AFD) based on the Palm...
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2025-04-01
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| author | Donovan Ramírez-Acevedo Ricardo Rafael Ambriz Christian Jesús García Cesar Mendoza Gómora David Jaramillo |
| author_facet | Donovan Ramírez-Acevedo Ricardo Rafael Ambriz Christian Jesús García Cesar Mendoza Gómora David Jaramillo |
| author_sort | Donovan Ramírez-Acevedo |
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| description | The fatigue life curve was determined for the AL6XN stainless steel under strain-controlled Low Cycle Fatigue (LCF) tests. Additionally, a specific number of loading cycles were applied to new specimens made from the same AL6XN alloy batch to set an Accumulated Fatigue Damage (AFD) based on the Palmgren–Miner rule. The AFD was 0.25, 0.50 and 0.75; subsequently, these specimens were subjected to tensile tests. It was observed that all AFD specimens exhibited a yield strength increment with respect to the AL6XN material property, thus, it was similar to a strain-hardening mechanism. However, the stress–strain behavior and microstructure characterization showed a microvoid nucleation and growth mechanism that competed against the strain-hardening one. The fracture in the 0.75 AFD specimens was dominated by this microvoid-based mechanism. The experimental results indicated that the strain-hardening exponent (<i>n</i>-value) and electrical resistivity (<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mi>ρ</mi></mrow></semantics></math></inline-formula>-value) were consistently modified by the AFD in all the specimens, with an inverse linear relationship for the <i>n</i>-value and a nonlinear increasing behavior for the <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mi>ρ</mi></mrow></semantics></math></inline-formula>-value. |
| format | Article |
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| publishDate | 2025-04-01 |
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| spelling | doaj-art-920371ef7a69421e8328727fab7d2e662025-08-20T03:14:39ZengMDPI AGMetals2075-47012025-04-0115547210.3390/met15050472Fatigue Damage Assessment in AL6XN Stainless Steel Based on the Strain-Hardening Exponent <i>n</i>-ValueDonovan Ramírez-Acevedo0Ricardo Rafael Ambriz1Christian Jesús García2Cesar Mendoza Gómora3David Jaramillo4Instituto Politécnico Nacional CIITEC-IPN, Cerrada de Cecati S/N Col. Sta. Catarina, Azcapotzalco, Ciudad de México 02250, MexicoInstituto Politécnico Nacional CIITEC-IPN, Cerrada de Cecati S/N Col. Sta. Catarina, Azcapotzalco, Ciudad de México 02250, MexicoInstituto Politécnico Nacional CIITEC-IPN, Cerrada de Cecati S/N Col. Sta. Catarina, Azcapotzalco, Ciudad de México 02250, MexicoInstituto Politécnico Nacional CIITEC-IPN, Cerrada de Cecati S/N Col. Sta. Catarina, Azcapotzalco, Ciudad de México 02250, MexicoInstituto Politécnico Nacional CIITEC-IPN, Cerrada de Cecati S/N Col. Sta. Catarina, Azcapotzalco, Ciudad de México 02250, MexicoThe fatigue life curve was determined for the AL6XN stainless steel under strain-controlled Low Cycle Fatigue (LCF) tests. Additionally, a specific number of loading cycles were applied to new specimens made from the same AL6XN alloy batch to set an Accumulated Fatigue Damage (AFD) based on the Palmgren–Miner rule. The AFD was 0.25, 0.50 and 0.75; subsequently, these specimens were subjected to tensile tests. It was observed that all AFD specimens exhibited a yield strength increment with respect to the AL6XN material property, thus, it was similar to a strain-hardening mechanism. However, the stress–strain behavior and microstructure characterization showed a microvoid nucleation and growth mechanism that competed against the strain-hardening one. The fracture in the 0.75 AFD specimens was dominated by this microvoid-based mechanism. The experimental results indicated that the strain-hardening exponent (<i>n</i>-value) and electrical resistivity (<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mi>ρ</mi></mrow></semantics></math></inline-formula>-value) were consistently modified by the AFD in all the specimens, with an inverse linear relationship for the <i>n</i>-value and a nonlinear increasing behavior for the <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mi>ρ</mi></mrow></semantics></math></inline-formula>-value.https://www.mdpi.com/2075-4701/15/5/472accumulated fatigue damageLCF testsstrain-hardening mechanismmicrovoid nucleation and growth mechanismAL6XN alloyelectrical resistivity |
| spellingShingle | Donovan Ramírez-Acevedo Ricardo Rafael Ambriz Christian Jesús García Cesar Mendoza Gómora David Jaramillo Fatigue Damage Assessment in AL6XN Stainless Steel Based on the Strain-Hardening Exponent <i>n</i>-Value Metals accumulated fatigue damage LCF tests strain-hardening mechanism microvoid nucleation and growth mechanism AL6XN alloy electrical resistivity |
| title | Fatigue Damage Assessment in AL6XN Stainless Steel Based on the Strain-Hardening Exponent <i>n</i>-Value |
| title_full | Fatigue Damage Assessment in AL6XN Stainless Steel Based on the Strain-Hardening Exponent <i>n</i>-Value |
| title_fullStr | Fatigue Damage Assessment in AL6XN Stainless Steel Based on the Strain-Hardening Exponent <i>n</i>-Value |
| title_full_unstemmed | Fatigue Damage Assessment in AL6XN Stainless Steel Based on the Strain-Hardening Exponent <i>n</i>-Value |
| title_short | Fatigue Damage Assessment in AL6XN Stainless Steel Based on the Strain-Hardening Exponent <i>n</i>-Value |
| title_sort | fatigue damage assessment in al6xn stainless steel based on the strain hardening exponent i n i value |
| topic | accumulated fatigue damage LCF tests strain-hardening mechanism microvoid nucleation and growth mechanism AL6XN alloy electrical resistivity |
| url | https://www.mdpi.com/2075-4701/15/5/472 |
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