典型文献
Development and evaluation of a hot-rolled 780 MPa steel sheet with an ultra-high expansion ratio
文献摘要:
This paper explores the development of a 780 MPa hot-rolled high-strength steel with an ultra-high hole expansion ratio(HER)by using a nanoprecipitation-controlled technology.Systematic analysis and evaluation of an industrially produced steel sheet have been performed to investigate the microstructure,nanoprecipitates,tensile properties,HER,bendability,and forming limit diagram.The newly developed 780 MPa hot-rolled high-strength steel sheet is composed of a fully ferritic microstructure of approximately 5 μm with precipitates of approximately 4-5 nm in ferrite grain interiors.The yield strength and tensile strength can reach above 700 and 780 MPa,respectively.Moreover,the fractured elongation is higher than 19%in the transversal direction,and the average HER exceeds 70%.Furthermore,the newly developed 780 MPa high-strength steel has good bendability reaching R/t=0.2 at 90°.Compared with the conventional 780 MPa high-strength steel,the newly developed 780 MPa high-strength steel exhibits superior forming ability,which is suitable for the production of complex components.High-cycle fatigue indicates that the fatigue limit of the newly developed high-strength steel is 430 MPa under a stress ratio of r=-1,indicating good fatigue properties.The excellent combined mechanical properties of the newly developed 780 MPa high-strength steel are attributed to the grain-refined ferritic microstructure with nanoprecipitates in ferrite grain interiors.
文献关键词:
中图分类号:
作者姓名:
ZHANG Chen;WANG Huanrong
作者机构:
Research Institute,Baoshan Iron & Steel Co.,Ltd.,Shanghai 201999,China
文献出处:
引用格式:
[1]ZHANG Chen;WANG Huanrong-.Development and evaluation of a hot-rolled 780 MPa steel sheet with an ultra-high expansion ratio)[J].宝钢技术研究(英文版),2022(03):35-40
A类:
bendability
B类:
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AB值:
0.447426
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