Towards the understanding of fracture resistance of an ultrahigh-strength martensitic press-hardened steel
Identifying the fracture resistance capabilities and gaining a deeper understanding of the controlling damage mechanisms are important to the development of press-hardened steels (PHS) for automotive applications. In this study, the fracture properties of a novel PHS alloyed with Cr and Si (CrSi-PHS...
| Main Authors: | , , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2023-11-01
|
| Series: | Journal of Materials Research and Technology |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2238785423025383 |
| _version_ | 1797301506592997376 |
|---|---|
| author | Qingquan Lai Zixuan Chen Yuntao Wei Qi Lu Yi Ma Jianfeng Wang Guohua Fan |
| author_facet | Qingquan Lai Zixuan Chen Yuntao Wei Qi Lu Yi Ma Jianfeng Wang Guohua Fan |
| author_sort | Qingquan Lai |
| collection | DOAJ |
| description | Identifying the fracture resistance capabilities and gaining a deeper understanding of the controlling damage mechanisms are important to the development of press-hardened steels (PHS) for automotive applications. In this study, the fracture properties of a novel PHS alloyed with Cr and Si (CrSi-PHS) were assessed by using uniaxial tensile and double-edge notched tensile (DENT) tests. Under uniaxial tension, the fracture resistance is characterized by the fracture strain and work of fracture, and the CrSi-PHS presents a desirable compromise with strength when comparing with other grades of advance high-strength steels (AHSS). The large fracture strain is attributed to the high resistance to damage nucleation even with a high density of grain boundaries. Fracture toughness is characterized by the DENT tests. The fracture toughness parameters of CrSi-PHS are lower than that of the commercial PHS 22MnB5 but comparable to the multiphase AHSSs with lower strength levels. The stress triaxiality near the fatigue pre-crack in DENT tests leads to a change of damage mechanism in CrSi-PHS. The crack propagates discontinuously by joining the micro-cracks and subsequently by the ductile fracture of micro-ligaments. The local plasticity at the crack tip region is suggested to contribute significantly to the energy dissipation. The observations demonstrate a strong dependence of the fracture mode and fracture resistance on the loading condition in the ultrahigh-strength martensitic steels. |
| first_indexed | 2024-03-07T23:23:34Z |
| format | Article |
| id | doaj.art-2af94a5c3de3440798fa17ca472210d9 |
| institution | Directory Open Access Journal |
| issn | 2238-7854 |
| language | English |
| last_indexed | 2024-03-07T23:23:34Z |
| publishDate | 2023-11-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of Materials Research and Technology |
| spelling | doaj.art-2af94a5c3de3440798fa17ca472210d92024-02-21T05:26:11ZengElsevierJournal of Materials Research and Technology2238-78542023-11-012719962006Towards the understanding of fracture resistance of an ultrahigh-strength martensitic press-hardened steelQingquan Lai0Zixuan Chen1Yuntao Wei2Qi Lu3Yi Ma4Jianfeng Wang5Guohua Fan6Key Laboratory for Light-weight Materials, Nanjing Tech University, Nanjing, China; Corresponding author.Herbert Gleiter Institute of Nanoscience, Nanjing University of Science and Technology, Nanjing, ChinaHerbert Gleiter Institute of Nanoscience, Nanjing University of Science and Technology, Nanjing, ChinaChina Science Laboratory, General Motors Global Research and Development, Shanghai, China; Corresponding author.Key Laboratory for Light-weight Materials, Nanjing Tech University, Nanjing, ChinaChina Science Laboratory, General Motors Global Research and Development, Shanghai, ChinaKey Laboratory for Light-weight Materials, Nanjing Tech University, Nanjing, ChinaIdentifying the fracture resistance capabilities and gaining a deeper understanding of the controlling damage mechanisms are important to the development of press-hardened steels (PHS) for automotive applications. In this study, the fracture properties of a novel PHS alloyed with Cr and Si (CrSi-PHS) were assessed by using uniaxial tensile and double-edge notched tensile (DENT) tests. Under uniaxial tension, the fracture resistance is characterized by the fracture strain and work of fracture, and the CrSi-PHS presents a desirable compromise with strength when comparing with other grades of advance high-strength steels (AHSS). The large fracture strain is attributed to the high resistance to damage nucleation even with a high density of grain boundaries. Fracture toughness is characterized by the DENT tests. The fracture toughness parameters of CrSi-PHS are lower than that of the commercial PHS 22MnB5 but comparable to the multiphase AHSSs with lower strength levels. The stress triaxiality near the fatigue pre-crack in DENT tests leads to a change of damage mechanism in CrSi-PHS. The crack propagates discontinuously by joining the micro-cracks and subsequently by the ductile fracture of micro-ligaments. The local plasticity at the crack tip region is suggested to contribute significantly to the energy dissipation. The observations demonstrate a strong dependence of the fracture mode and fracture resistance on the loading condition in the ultrahigh-strength martensitic steels.http://www.sciencedirect.com/science/article/pii/S2238785423025383Press-hardened steelsMartensiteDamageCrackFracture toughness |
| spellingShingle | Qingquan Lai Zixuan Chen Yuntao Wei Qi Lu Yi Ma Jianfeng Wang Guohua Fan Towards the understanding of fracture resistance of an ultrahigh-strength martensitic press-hardened steel Journal of Materials Research and Technology Press-hardened steels Martensite Damage Crack Fracture toughness |
| title | Towards the understanding of fracture resistance of an ultrahigh-strength martensitic press-hardened steel |
| title_full | Towards the understanding of fracture resistance of an ultrahigh-strength martensitic press-hardened steel |
| title_fullStr | Towards the understanding of fracture resistance of an ultrahigh-strength martensitic press-hardened steel |
| title_full_unstemmed | Towards the understanding of fracture resistance of an ultrahigh-strength martensitic press-hardened steel |
| title_short | Towards the understanding of fracture resistance of an ultrahigh-strength martensitic press-hardened steel |
| title_sort | towards the understanding of fracture resistance of an ultrahigh strength martensitic press hardened steel |
| topic | Press-hardened steels Martensite Damage Crack Fracture toughness |
| url | http://www.sciencedirect.com/science/article/pii/S2238785423025383 |
| work_keys_str_mv | AT qingquanlai towardstheunderstandingoffractureresistanceofanultrahighstrengthmartensiticpresshardenedsteel AT zixuanchen towardstheunderstandingoffractureresistanceofanultrahighstrengthmartensiticpresshardenedsteel AT yuntaowei towardstheunderstandingoffractureresistanceofanultrahighstrengthmartensiticpresshardenedsteel AT qilu towardstheunderstandingoffractureresistanceofanultrahighstrengthmartensiticpresshardenedsteel AT yima towardstheunderstandingoffractureresistanceofanultrahighstrengthmartensiticpresshardenedsteel AT jianfengwang towardstheunderstandingoffractureresistanceofanultrahighstrengthmartensiticpresshardenedsteel AT guohuafan towardstheunderstandingoffractureresistanceofanultrahighstrengthmartensiticpresshardenedsteel |