The Relationship Between Fracture Toughness and Blanking Performance of 850MPa Hot-Rolled Steels
Hot-rolled steel grades can serve as cost-effective and high-performance solutions for automotive and heavy transportation chassis and seat parts. These applications generate significant demand for cut-edge quality, stretch flangeability, and fracture toughness. This study investigated two thermomec...
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EDP Sciences
2025-01-01
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| Series: | MATEC Web of Conferences |
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| Online Access: | https://www.matec-conferences.org/articles/matecconf/pdf/2025/02/matecconf_iddrg2025_01034.pdf |
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| author | Kesti Vili Grifé Laura Plosila Pekka Frómeta David Kaijalainen Antti |
| author_facet | Kesti Vili Grifé Laura Plosila Pekka Frómeta David Kaijalainen Antti |
| author_sort | Kesti Vili |
| collection | DOAJ |
| description | Hot-rolled steel grades can serve as cost-effective and high-performance solutions for automotive and heavy transportation chassis and seat parts. These applications generate significant demand for cut-edge quality, stretch flangeability, and fracture toughness. This study investigated two thermomechanically hot-rolled steel grades, 850F and 850CP, both of which exhibited a tensile strength of 850 MPa. To assess the performance in chassis and seat applications, materials were examined using ISO 16630 hole-expansion, mechanical punching, shearing, and fine blanking tests. Thin sheet fracture toughness was determined by essential work of fracture (EWF) tests, with fatigue pre-cracks. The test results indicate that the 850CP material demonstrates only a marginally better hole-expansion ratio (HER), but significantly enhanced cut edge quality in punching, shearing, and fine blanking processes. Another substantial difference is the fracture performance of the materials, with 850CP exhibiting a superior essential work of fracture (We) compared to 850F: 545 kJ/m2 vs. 203 kJ/m2, respectively. The results indicate that 850CP is a highly suitable material for applications requiring superior cut-edge quality across diverse cutting processes, in conjunction with exceptionally high fracture toughness. The results also demonstrate that the fracture toughness can be a good indicator of the sheared-edge crack propagation behavior. |
| format | Article |
| id | doaj-art-5fcd1659db7442aba147899e5136a535 |
| institution | Kabale University |
| issn | 2261-236X |
| language | English |
| publishDate | 2025-01-01 |
| publisher | EDP Sciences |
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| series | MATEC Web of Conferences |
| spelling | doaj-art-5fcd1659db7442aba147899e5136a5352025-08-20T03:53:51ZengEDP SciencesMATEC Web of Conferences2261-236X2025-01-014080103410.1051/matecconf/202540801034matecconf_iddrg2025_01034The Relationship Between Fracture Toughness and Blanking Performance of 850MPa Hot-Rolled SteelsKesti Vili0Grifé Laura1Plosila Pekka2Frómeta David3Kaijalainen Antti4SSAB Europe, Knowledge Service CenterEurecat, Centre Tecnològic de Catalunya, Unit of Metallic and Ceramic MaterialsUniversity of Oulu, Materials and Mechanical Engineering, Centre for Advanced Steels ResearchEurecat, Centre Tecnològic de Catalunya, Unit of Metallic and Ceramic MaterialsUniversity of Oulu, Materials and Mechanical Engineering, Centre for Advanced Steels ResearchHot-rolled steel grades can serve as cost-effective and high-performance solutions for automotive and heavy transportation chassis and seat parts. These applications generate significant demand for cut-edge quality, stretch flangeability, and fracture toughness. This study investigated two thermomechanically hot-rolled steel grades, 850F and 850CP, both of which exhibited a tensile strength of 850 MPa. To assess the performance in chassis and seat applications, materials were examined using ISO 16630 hole-expansion, mechanical punching, shearing, and fine blanking tests. Thin sheet fracture toughness was determined by essential work of fracture (EWF) tests, with fatigue pre-cracks. The test results indicate that the 850CP material demonstrates only a marginally better hole-expansion ratio (HER), but significantly enhanced cut edge quality in punching, shearing, and fine blanking processes. Another substantial difference is the fracture performance of the materials, with 850CP exhibiting a superior essential work of fracture (We) compared to 850F: 545 kJ/m2 vs. 203 kJ/m2, respectively. The results indicate that 850CP is a highly suitable material for applications requiring superior cut-edge quality across diverse cutting processes, in conjunction with exceptionally high fracture toughness. The results also demonstrate that the fracture toughness can be a good indicator of the sheared-edge crack propagation behavior.https://www.matec-conferences.org/articles/matecconf/pdf/2025/02/matecconf_iddrg2025_01034.pdfedge qualityfine blankingfracture toughnesshigh-strength steel |
| spellingShingle | Kesti Vili Grifé Laura Plosila Pekka Frómeta David Kaijalainen Antti The Relationship Between Fracture Toughness and Blanking Performance of 850MPa Hot-Rolled Steels MATEC Web of Conferences edge quality fine blanking fracture toughness high-strength steel |
| title | The Relationship Between Fracture Toughness and Blanking Performance of 850MPa Hot-Rolled Steels |
| title_full | The Relationship Between Fracture Toughness and Blanking Performance of 850MPa Hot-Rolled Steels |
| title_fullStr | The Relationship Between Fracture Toughness and Blanking Performance of 850MPa Hot-Rolled Steels |
| title_full_unstemmed | The Relationship Between Fracture Toughness and Blanking Performance of 850MPa Hot-Rolled Steels |
| title_short | The Relationship Between Fracture Toughness and Blanking Performance of 850MPa Hot-Rolled Steels |
| title_sort | relationship between fracture toughness and blanking performance of 850mpa hot rolled steels |
| topic | edge quality fine blanking fracture toughness high-strength steel |
| url | https://www.matec-conferences.org/articles/matecconf/pdf/2025/02/matecconf_iddrg2025_01034.pdf |
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