| Autor: |
SUN Hao-fei, XIAO Zhi, WEI Kai, YANG Xu-jing, QI Jun |
| Jazyk: |
čínština |
| Rok vydání: |
2021 |
| Předmět: |
|
| Zdroj: |
Cailiao gongcheng, Vol 49, Iss 8, Pp 81-88 (2021) |
| Druh dokumentu: |
article |
| ISSN: |
1001-4381 |
| DOI: |
10.11868/j.issn.1001-4381.2020.001012 |
| Popis: |
The pre-bending specimens were obtained by stamping with complex phase steel CP800, and the effect of pre-bending deformation on microstructure, residual stress and mechanical properties of the steel were studied by using EBSD, X-ray residual stress measurement system, tensile testing machine,DIC technique, etc. The results show that the distribution of residual stress of pre-bending specimens exhibits stress distribution of tension-compression-tension-compression, which means that the inside surface (compression layer) is tension stress and outside surface (tension layer) is compression stress. Such special distribution leads to a 16% reduction of yield stress of specimens after pre-bending. Meanwhile, due to the dislocation strengthening and hardening caused by cold deformation, the elongation of material decreases by 25% and the tensile strength increases by 24% after pre-bending. Furthermore, it is found that the inside surface produces greater plastic strain and is broken earlier than the outside surface due to the existence of tensile residual stress. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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