High dislocation density-induced large ductility in deformed and partitioned steels.

Autor: He BB; Department of Mechanical Engineering, The University of Hong Kong, Pokfulam Road, Hong Kong, China., Hu B; School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Xue Yuan Lu 30, Beijing 100083, China., Yen HW; Department of Materials Science and Engineering, National Taiwan University, Roosevelt Road, Taipei 10617, Taiwan., Cheng GJ; Department of Materials Science and Engineering, National Taiwan University, Roosevelt Road, Taipei 10617, Taiwan., Wang ZK; Department of Mechanical and Biomedical Engineering, City University of Hong Kong, Tat Chee Avenue, Hong Kong, China., Luo HW; School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Xue Yuan Lu 30, Beijing 100083, China. mxhuang@hku.hk luohaiwen@ustb.edu.cn., Huang MX; Department of Mechanical Engineering, The University of Hong Kong, Pokfulam Road, Hong Kong, China. mxhuang@hku.hk luohaiwen@ustb.edu.cn.
Jazyk: angličtina
Zdroj: Science (New York, N.Y.) [Science] 2017 Sep 08; Vol. 357 (6355), pp. 1029-1032. Date of Electronic Publication: 2017 Aug 24.
DOI: 10.1126/science.aan0177
Abstrakt: A wide variety of industrial applications require materials with high strength and ductility. Unfortunately, the strategies for increasing material strength, such as processing to create line defects (dislocations), tend to decrease ductility. We developed a strategy to circumvent this in inexpensive, medium manganese steel. Cold rolling followed by low-temperature tempering developed steel with metastable austenite grains embedded in a highly dislocated martensite matrix. This deformed and partitioned (D and P) process produced dislocation hardening but retained high ductility, both through the glide of intensive mobile dislocations and by allowing us to control martensitic transformation. The D and P strategy should apply to any other alloy with deformation-induced martensitic transformation and provides a pathway for the development of high-strength, high-ductility materials.
(Copyright © 2017 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works.)
Databáze: MEDLINE
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