期刊
出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2021.142280
关键词
Marine steel plate; High strength; High impact toughness; Strengthening mechanism; Martensite
类别
资金
- National Key R&D Program of China [2017YFB0304402]
- National Natural Science Foundation of China [51971127]
A cost-saving marine steel plate with 1000 MPa yield strength was developed based on nano-particles precipitation in a lath martensitic matrix. The optimized mechanical properties were achieved through conventional heat treatment methods. The high strength was attributed to various strengthening mechanisms such as grain refinement, dislocation strengthening, solid solution strengthening, and precipitation strengthening. The excellent impact toughness was due to the unique microstructure characteristics of fine film-like stable austenite and delamination structure.
One kind of cost-saving marine steel plate with 1000 MPa yield strength was successfully processed based on the alloying concept of nano-particles precipitation in a lath martensitic matrix. The conventional quenching and tempering heat treatment was adopted to optimize the mechanical properties. The experimental steel with lower alloy content exhibited excellent performance, i.e., the yield strength above 1030 MPa at room temperature, and the impact energy above 69 J at -40 degrees C. The microstructural evolution, precipitation behavior and dislocation density were systematically studied by optical microscopy, field emission scanning electron microscopy, X-ray diffraction and transmission electron microscopy. It was shown that the high strength resulted from grain refinement, dislocation strengthening, solid solution strengthening and precipitation strengthening. The role of every strengthening mechanism was quantitively evaluated so that the yield strength could be accurately estimated. Base on this study, it could be concluded that the precipitation strengthening had a significant contribution to yield strength. In addition, the excellent impact toughness of the steel was attributed to its unique microstructure characteristics of fine film-like stable austenite and delamination structure.
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