Influences of the constrained groove pressing on microstructural, mechanical, and fracture properties of brass sheets
Constrained groove pressing (CGP) was used for the production of fine-grained brass sheets in different conditions. The process was conducted up to two cycles on brass sheets at room temperature and then half cycle at the temperature of 200 °C. Optical microscopy (OM), scanning electron microscopy (...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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IOP Publishing
2020-01-01
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| Series: | Materials Research Express |
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| Online Access: | https://doi.org/10.1088/2053-1591/abc9f2 |
| _version_ | 1797746786119450624 |
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| author | A Shahmirzaloo S M Hosseini A Siahsarani D Rahmatabadi R Hashemi G Faraji |
| author_facet | A Shahmirzaloo S M Hosseini A Siahsarani D Rahmatabadi R Hashemi G Faraji |
| author_sort | A Shahmirzaloo |
| collection | DOAJ |
| description | Constrained groove pressing (CGP) was used for the production of fine-grained brass sheets in different conditions. The process was conducted up to two cycles on brass sheets at room temperature and then half cycle at the temperature of 200 °C. Optical microscopy (OM), scanning electron microscopy (SEM), microhardness measurement, and plane stress fracture toughness was used to investigate the microstructure, mechanical properties, and fracture behavior. Microhardness measurement showed the capability of the CGP process in increasing the hardness of the refined sheets. It also showed the inhomogeneity of the hardness along the thickness of the sample after the process. The Digital Image Correlation (DIC) technique was used to investigate the elastic and plastic factors of the sheets along with the major mechanical properties of samples. The results showed a slight increase and reduction in the Young modulus and Poisson’s ratios after the process, respectively. Moreover, after two CGP cycles applying half cycle at the temperature of 200 °C did not show any significant effect on these values. The strength coefficient was as like as yield and ultimate strengths increased by increasing the number of the passes. However, processing at a higher temperature of 200 °C showed lower values for the parameters, as mentioned earlier, compared to the specimens processed at room temperature. The strain hardening index experienced a major reduction after the CGP process due to the effects of strain hardening. The anisotropy coefficient, which plays a critical factor in the severe deformation of sheets, was increased after the CGP process. However, this ratio decreased in higher passes or elevated temperatures. The highest anisotropy coefficient was obtained after the first cycle of the process. Moreover, SEM observation of the fracture surface showed shearing ductile rupture mode in the processed samples rather than ductile mode due to appearing of small and elongated dimples. |
| first_indexed | 2024-03-12T15:42:47Z |
| format | Article |
| id | doaj.art-1564f0f88ef74026a798ec13379f373d |
| institution | Directory Open Access Journal |
| issn | 2053-1591 |
| language | English |
| last_indexed | 2024-03-12T15:42:47Z |
| publishDate | 2020-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | Materials Research Express |
| spelling | doaj.art-1564f0f88ef74026a798ec13379f373d2023-08-09T15:53:34ZengIOP PublishingMaterials Research Express2053-15912020-01-0171111652610.1088/2053-1591/abc9f2Influences of the constrained groove pressing on microstructural, mechanical, and fracture properties of brass sheetsA Shahmirzaloo0S M Hosseini1A Siahsarani2D Rahmatabadi3https://orcid.org/0000-0002-6898-3061R Hashemi4https://orcid.org/0000-0001-8369-0390G Faraji5Innovative Structural Design, Eindhoven University of Technology , Eindhoven, Netherlands; School of Mechanical Engineering, University of Tehran , Tehran, IranSchool of Mechanical Engineering, University of Tehran , Tehran, IranSchool of Mechanical Engineering, University of Tehran , Tehran, IranSchool of Mechanical Engineering, University of Tehran , Tehran, IranSchool of Mechanical Engineering, Iran University of Science and Technology , Tehran, IranSchool of Mechanical Engineering, University of Tehran , Tehran, IranConstrained groove pressing (CGP) was used for the production of fine-grained brass sheets in different conditions. The process was conducted up to two cycles on brass sheets at room temperature and then half cycle at the temperature of 200 °C. Optical microscopy (OM), scanning electron microscopy (SEM), microhardness measurement, and plane stress fracture toughness was used to investigate the microstructure, mechanical properties, and fracture behavior. Microhardness measurement showed the capability of the CGP process in increasing the hardness of the refined sheets. It also showed the inhomogeneity of the hardness along the thickness of the sample after the process. The Digital Image Correlation (DIC) technique was used to investigate the elastic and plastic factors of the sheets along with the major mechanical properties of samples. The results showed a slight increase and reduction in the Young modulus and Poisson’s ratios after the process, respectively. Moreover, after two CGP cycles applying half cycle at the temperature of 200 °C did not show any significant effect on these values. The strength coefficient was as like as yield and ultimate strengths increased by increasing the number of the passes. However, processing at a higher temperature of 200 °C showed lower values for the parameters, as mentioned earlier, compared to the specimens processed at room temperature. The strain hardening index experienced a major reduction after the CGP process due to the effects of strain hardening. The anisotropy coefficient, which plays a critical factor in the severe deformation of sheets, was increased after the CGP process. However, this ratio decreased in higher passes or elevated temperatures. The highest anisotropy coefficient was obtained after the first cycle of the process. Moreover, SEM observation of the fracture surface showed shearing ductile rupture mode in the processed samples rather than ductile mode due to appearing of small and elongated dimples.https://doi.org/10.1088/2053-1591/abc9f2constrained groove pressingbrass alloydigital image correlationplane stress fracture toughnessmechanical propertiesanisotropy coefficient |
| spellingShingle | A Shahmirzaloo S M Hosseini A Siahsarani D Rahmatabadi R Hashemi G Faraji Influences of the constrained groove pressing on microstructural, mechanical, and fracture properties of brass sheets Materials Research Express constrained groove pressing brass alloy digital image correlation plane stress fracture toughness mechanical properties anisotropy coefficient |
| title | Influences of the constrained groove pressing on microstructural, mechanical, and fracture properties of brass sheets |
| title_full | Influences of the constrained groove pressing on microstructural, mechanical, and fracture properties of brass sheets |
| title_fullStr | Influences of the constrained groove pressing on microstructural, mechanical, and fracture properties of brass sheets |
| title_full_unstemmed | Influences of the constrained groove pressing on microstructural, mechanical, and fracture properties of brass sheets |
| title_short | Influences of the constrained groove pressing on microstructural, mechanical, and fracture properties of brass sheets |
| title_sort | influences of the constrained groove pressing on microstructural mechanical and fracture properties of brass sheets |
| topic | constrained groove pressing brass alloy digital image correlation plane stress fracture toughness mechanical properties anisotropy coefficient |
| url | https://doi.org/10.1088/2053-1591/abc9f2 |
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