Excellent ductility of an austenitic stainless steel at a high strength level achieved by a simple process
In the pursuit of simultaneously improving the yield strength and plasticity of austenitic stainless steel, a new austenitic stainless steel was fabricated by induction smelting using a pure N2 atmosphere, hot forging, cryogenic rolling, and annealing. The material was characterized by microstructur...
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| Format: | Article |
| Language: | English |
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Elsevier
2024-03-01
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| Series: | Materials & Design |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S0264127524001680 |
| _version_ | 1827313740673974272 |
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| author | Yongqiang Wang Chaojun Hu Kai Tian Na Li Juan Du Xiaobin Shi Chengsi Zheng |
| author_facet | Yongqiang Wang Chaojun Hu Kai Tian Na Li Juan Du Xiaobin Shi Chengsi Zheng |
| author_sort | Yongqiang Wang |
| collection | DOAJ |
| description | In the pursuit of simultaneously improving the yield strength and plasticity of austenitic stainless steel, a new austenitic stainless steel was fabricated by induction smelting using a pure N2 atmosphere, hot forging, cryogenic rolling, and annealing. The material was characterized by microstructures with 3–4 μm uniform finer grains, fine precipitates, high thermal stability austenite, and extensive high-angle grain boundaries. The elongation after fracture, yield strength, and ultimate tensile strength of the samples reached 53.5 %, 707 MPa, and 1020 MPa, respectively, as well as 61 %, 600 MPa, and 977 MPa, respectively, at the same time. Moreover, a high strain hardening rate was achieved in the new stainless steel. The appropriate uniform finer grains not only played a role in grain-refined strengthening but also provided intragranular spaces and sufficient mean free available paths for dislocation accumulation and movement. Precipitates, which were coherent or semi-coherent with the matrix, provided interfaces for dislocation accumulation and obstructions for dislocation movement. Extensive high-angle grain boundaries with appropriate finer grains served as another important factor for excellent ductility due to the inhabitation and resulting deviation of crack propagation. In addition, strain-induced mechanical twinning in the current austenitic stainless steel contributed to excellent ductility and high strength. |
| first_indexed | 2024-03-07T20:06:09Z |
| format | Article |
| id | doaj.art-869ea67e973f472bbfbab3af093085f9 |
| institution | Directory Open Access Journal |
| issn | 0264-1275 |
| language | English |
| last_indexed | 2024-04-24T22:21:31Z |
| publishDate | 2024-03-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Materials & Design |
| spelling | doaj.art-869ea67e973f472bbfbab3af093085f92024-03-20T06:08:24ZengElsevierMaterials & Design0264-12752024-03-01239112796Excellent ductility of an austenitic stainless steel at a high strength level achieved by a simple processYongqiang Wang0Chaojun Hu1Kai Tian2Na Li3Juan Du4Xiaobin Shi5Chengsi Zheng6Key Laboratory of Green Fabrication and Surface Technology of Advanced Metal Materials, Ministry of Education, Anhui University of Technology, Maanshan 243002, China; School of Materials Science and Engineering, Anhui University of Technology, Maanshan 243002, ChinaKey Laboratory of Green Fabrication and Surface Technology of Advanced Metal Materials, Ministry of Education, Anhui University of Technology, Maanshan 243002, ChinaKey Laboratory of Green Fabrication and Surface Technology of Advanced Metal Materials, Ministry of Education, Anhui University of Technology, Maanshan 243002, ChinaSchool of Metallurgical Engineering, Anhui University of Technology, Maanshan 243002, China; Corresponding author.Key Laboratory of Green Fabrication and Surface Technology of Advanced Metal Materials, Ministry of Education, Anhui University of Technology, Maanshan 243002, ChinaKey Laboratory of Green Fabrication and Surface Technology of Advanced Metal Materials, Ministry of Education, Anhui University of Technology, Maanshan 243002, China; School of Materials Science and Engineering, Anhui University of Technology, Maanshan 243002, ChinaKey Laboratory of Green Fabrication and Surface Technology of Advanced Metal Materials, Ministry of Education, Anhui University of Technology, Maanshan 243002, China; School of Materials Science and Engineering, Anhui University of Technology, Maanshan 243002, ChinaIn the pursuit of simultaneously improving the yield strength and plasticity of austenitic stainless steel, a new austenitic stainless steel was fabricated by induction smelting using a pure N2 atmosphere, hot forging, cryogenic rolling, and annealing. The material was characterized by microstructures with 3–4 μm uniform finer grains, fine precipitates, high thermal stability austenite, and extensive high-angle grain boundaries. The elongation after fracture, yield strength, and ultimate tensile strength of the samples reached 53.5 %, 707 MPa, and 1020 MPa, respectively, as well as 61 %, 600 MPa, and 977 MPa, respectively, at the same time. Moreover, a high strain hardening rate was achieved in the new stainless steel. The appropriate uniform finer grains not only played a role in grain-refined strengthening but also provided intragranular spaces and sufficient mean free available paths for dislocation accumulation and movement. Precipitates, which were coherent or semi-coherent with the matrix, provided interfaces for dislocation accumulation and obstructions for dislocation movement. Extensive high-angle grain boundaries with appropriate finer grains served as another important factor for excellent ductility due to the inhabitation and resulting deviation of crack propagation. In addition, strain-induced mechanical twinning in the current austenitic stainless steel contributed to excellent ductility and high strength.http://www.sciencedirect.com/science/article/pii/S0264127524001680Austenitic stainless steelDuctility and strengthPrecipitatesHigh-angle grain boundariesMulti-element synergistic strengthening |
| spellingShingle | Yongqiang Wang Chaojun Hu Kai Tian Na Li Juan Du Xiaobin Shi Chengsi Zheng Excellent ductility of an austenitic stainless steel at a high strength level achieved by a simple process Materials & Design Austenitic stainless steel Ductility and strength Precipitates High-angle grain boundaries Multi-element synergistic strengthening |
| title | Excellent ductility of an austenitic stainless steel at a high strength level achieved by a simple process |
| title_full | Excellent ductility of an austenitic stainless steel at a high strength level achieved by a simple process |
| title_fullStr | Excellent ductility of an austenitic stainless steel at a high strength level achieved by a simple process |
| title_full_unstemmed | Excellent ductility of an austenitic stainless steel at a high strength level achieved by a simple process |
| title_short | Excellent ductility of an austenitic stainless steel at a high strength level achieved by a simple process |
| title_sort | excellent ductility of an austenitic stainless steel at a high strength level achieved by a simple process |
| topic | Austenitic stainless steel Ductility and strength Precipitates High-angle grain boundaries Multi-element synergistic strengthening |
| url | http://www.sciencedirect.com/science/article/pii/S0264127524001680 |
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