期刊
ACTA METALLURGICA SINICA-ENGLISH LETTERS
卷 33, 期 12, 页码 1657-1665出版社
CHINESE ACAD SCIENCES, INST METAL RESEARCH
DOI: 10.1007/s40195-020-01135-8
关键词
Steel; Quenching and partitioning; Austenite; Martensitic transformation; Electron backscatter diffraction (EBSD); Tensile test
资金
- National Key Research and Development Program of Thirteenth Five-year Plan Period [2017YFB0304400]
- National Natural Science Foundation of China [51574028]
The relationship between microstructure morphology and mechanical properties of the low-carbon steel (Fe-0.20C-2.59Mn-2.13Si) treated by different intercritical annealed quenching and partitioning (Q&P) processes was investigated through interrupted tensile tests plus quasi-situ electron backscatter diffraction measurements. Results show that size and distribution of retained austenite (RA) directly affect the sequence of deformation induced martensitic transformation. As strain increases, the equiaxed RA grains wrapped by ferrite transform first, followed by the equiaxed and film-like RA grains adjacent to martensite. Compared with traditional intercritical annealed Q&P steel with equiaxed structure, the steel with quenching pretreatment contains uniform lamellar structure and the relatively film-like type of RA, leading to the higher yield strength, tensile strength, and elongation, as well as the steady increase in dislocation density upon straining.
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