Further improvement in ductility induced by the refined hierarchical structures of pearlite
| Autor: | Jing Li, Pingwei Xu, Can Meng, Yu Liang |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
010302 applied physics
Austenite Materials science Misorientation Cementite Mechanical Engineering 02 engineering and technology 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Hierarchical refinement chemistry.chemical_compound chemistry Mechanics of Materials Ferrite (iron) 0103 physical sciences General Materials Science Lamellar structure Composite material Pearlite 0210 nano-technology Supercooling |
| Zdroj: | Materials Science and Engineering: A. 745:176-184 |
| ISSN: | 0921-5093 |
| DOI: | 10.1016/j.msea.2018.12.069 |
| Popis: | Significant improvement in ductility without strength loss is achieved by the hierarchical refinement of the pearlite in hypoeutectoid steels, through two approaches, i.e., the grain refinement and increasing the undercooling degree. The increased undercooling is achieved by a temporary undercooling treatment without austenite decomposition at bainitic temperature before the transformation of pearlite. Further refined colonies with increased misorientation are developed in the undercooled sample, whereas such colonies exhibit thicker ferrite plates and thinner cementite plates than fine-grained sample. The two aspects account for the higher ductility manifested by the undercooled sample, and the thickness ratio of cementite/ferrite plates can therefore be used to evaluate the ductility of lamellar pearlite. In addition, the uniformity of the colonies structure has positive effect on the enhanced ductility. This work provides a new understanding of high-performance fully pearlitic steels, which are expected to be applicable in drawing processes. |
| Databáze: | OpenAIRE |
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