Effect of segregations on mechanical properties and crack propagation in spring steel
Considerable efforts have been made over the last decades to improve performance of spring steels, which would increase the service time of springs and also allow vehicles weight reduction. There are different possibilities of improving properties of spring steels, from modifying the chemical compos...
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| Format: | Article |
| Language: | English |
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Gruppo Italiano Frattura
2015-09-01
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| Series: | Fracture and Structural Integrity |
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| Online Access: | https://www.fracturae.com/index.php/fis/article/view/1568 |
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| author | B. Žužek M. Sedlacek B. Podgornik |
| author_facet | B. Žužek M. Sedlacek B. Podgornik |
| author_sort | B. Žužek |
| collection | DOAJ |
| description | Considerable efforts have been made over the last decades to improve performance of spring
steels, which would increase the service time of springs and also allow vehicles weight reduction. There are
different possibilities of improving properties of spring steels, from modifying the chemical composition of
steels to optimizing the deformation process and changing the heat treatment parameters. Another way of
improving steel properties is through refining the microstructure and reducing amount of inclusions. Therefore,
the focus of the current investigation was to determine the effect of more uniform and cleaner microstructure
obtained through electro-slag remelting (ESR) of steel on the mechanical and dynamic properties of spring steel, with special focus on the resistance to fatigue crack propagation. Effect of the microstructure refinement was evaluated in terms of tensile strength, elongation, fracture and impact toughness, and fatigue resistance under bending and tensile loading. After the mechanical tests the fracture surfaces of samples were analyzed using scanning electron microscope (SEM) and the influence of microstructure properties on the crack propagation and crack propagation resistance was studied. Investigation was performed on hot rolled, soft annealed and vacuum heat treated 51CrV4 spring steel produced by conventional continuous casting and compared with steel additional refined through ESR. Results shows that elimination of segregations and microstructure refinement using additional ESR process gives some improvement in terms of better repeatability and reduced scattering, but on the other hand it has negative effect on crack propagation resistance and fatigue properties of the spring steel. |
| format | Article |
| id | doaj-art-da629ec1120d408a9ec5e619eeb8ed48 |
| institution | Kabale University |
| issn | 1971-8993 |
| language | English |
| publishDate | 2015-09-01 |
| publisher | Gruppo Italiano Frattura |
| record_format | Article |
| series | Fracture and Structural Integrity |
| spelling | doaj-art-da629ec1120d408a9ec5e619eeb8ed482025-01-02T23:01:01ZengGruppo Italiano FratturaFracture and Structural Integrity1971-89932015-09-0193410.3221/IGF-ESIS.34.17Effect of segregations on mechanical properties and crack propagation in spring steelB. ŽužekM. SedlacekB. PodgornikConsiderable efforts have been made over the last decades to improve performance of spring steels, which would increase the service time of springs and also allow vehicles weight reduction. There are different possibilities of improving properties of spring steels, from modifying the chemical composition of steels to optimizing the deformation process and changing the heat treatment parameters. Another way of improving steel properties is through refining the microstructure and reducing amount of inclusions. Therefore, the focus of the current investigation was to determine the effect of more uniform and cleaner microstructure obtained through electro-slag remelting (ESR) of steel on the mechanical and dynamic properties of spring steel, with special focus on the resistance to fatigue crack propagation. Effect of the microstructure refinement was evaluated in terms of tensile strength, elongation, fracture and impact toughness, and fatigue resistance under bending and tensile loading. After the mechanical tests the fracture surfaces of samples were analyzed using scanning electron microscope (SEM) and the influence of microstructure properties on the crack propagation and crack propagation resistance was studied. Investigation was performed on hot rolled, soft annealed and vacuum heat treated 51CrV4 spring steel produced by conventional continuous casting and compared with steel additional refined through ESR. Results shows that elimination of segregations and microstructure refinement using additional ESR process gives some improvement in terms of better repeatability and reduced scattering, but on the other hand it has negative effect on crack propagation resistance and fatigue properties of the spring steel.https://www.fracturae.com/index.php/fis/article/view/1568Spring steel |
| spellingShingle | B. Žužek M. Sedlacek B. Podgornik Effect of segregations on mechanical properties and crack propagation in spring steel Fracture and Structural Integrity Spring steel |
| title | Effect of segregations on mechanical properties and crack propagation in spring steel |
| title_full | Effect of segregations on mechanical properties and crack propagation in spring steel |
| title_fullStr | Effect of segregations on mechanical properties and crack propagation in spring steel |
| title_full_unstemmed | Effect of segregations on mechanical properties and crack propagation in spring steel |
| title_short | Effect of segregations on mechanical properties and crack propagation in spring steel |
| title_sort | effect of segregations on mechanical properties and crack propagation in spring steel |
| topic | Spring steel |
| url | https://www.fracturae.com/index.php/fis/article/view/1568 |
| work_keys_str_mv | AT bzuzek effectofsegregationsonmechanicalpropertiesandcrackpropagationinspringsteel AT msedlacek effectofsegregationsonmechanicalpropertiesandcrackpropagationinspringsteel AT bpodgornik effectofsegregationsonmechanicalpropertiesandcrackpropagationinspringsteel |