Abstract
Ultrafine-grained (UFG) 304 stainless steel is much stronger than its coarse-grained counterpart. However, it develops undesired Lüders bands during deformation. Here we report a bi-modal heterostructure that can effectively suppress Lüders deformation in the UFG 304 stainless steel, which produces a strong strain hardening to improve the ductility and toughness, without sacrificing much strength. These superior mechanical properties are attributed to strain delocalization capability of the bi-modal heterostructure, which results in lower stress concentration and consequently postpones the martensitic transformation.
| Original language | English |
|---|---|
| Article number | 143393 |
| Journal | Materials Science and Engineering A |
| Volume | 848 |
| Online published | 31 May 2022 |
| DOIs | |
| Publication status | Published - 19 Jul 2022 |
Funding
This work was supported by the Postdoctoral Research Foundation of China (Grant 2020M681602), the Jiangsu Postdoctoral Research Foundation (Grant 2020Z259) and the Natural Science Foundation of Jiangsu Province (Grant. BK20201308). The authors are thankful for the technical support from the Jiangsu Key Laboratory of Advanced Micro & Nano Materials and Technology, the Analysis and Test Center of Nanjing University of Science and Technology, and the Hong Kong Research Grants Council (GRF 11214121).
Research Keywords
- HDI hardening
- Heterostructure
- Lüders band
- Stainless steel
- Strain delocalization
RGC Funding Information
- RGC-funded
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Dive into the research topics of 'Heterostructure alleviates Lüders deformation of ultrafine-grained stainless steels'. Together they form a unique fingerprint.Projects
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GRF: Ultrastrong Dual-phase Heterostructure Low C.rbon Steel Reinforced by Ultra Nano Lamellae
ZHU, Y. (Principal Investigator / Project Coordinator)
1/09/21 → 11/08/25
Project: Research
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