A novel strengthening and toughening strategy for T250 maraging steel: Cluster-orientation governed higher strength-ductility combination induced by electropulsing
T250 steel is promising maraging steel for the development of ultrahigh strength structural materials due to the reduced cost of losing Co element. Whereas, the ductility of this steel is unsatisfactory owing to its high content of Ti. In this research, high-energy and instantaneous electropulsing i...
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doaj-ebc32e6e397e41b885f4b9a8c0f63beb2020-11-25T01:30:20ZengElsevierMaterials & Design0264-12752019-05-01169A novel strengthening and toughening strategy for T250 maraging steel: Cluster-orientation governed higher strength-ductility combination induced by electropulsingDong Pan0Yuguang Zhao1Xiaofeng Xu2Yitong Wang3Wenqiang Jiang4Xueying Chong5Key Laboratory of Automobile Materials, Ministry of Education, Department of Materials Science and Engineering, Jilin University, No. 5988 Renmin Street, Chang chun 130025, PR ChinaCorresponding author.; Key Laboratory of Automobile Materials, Ministry of Education, Department of Materials Science and Engineering, Jilin University, No. 5988 Renmin Street, Chang chun 130025, PR ChinaKey Laboratory of Automobile Materials, Ministry of Education, Department of Materials Science and Engineering, Jilin University, No. 5988 Renmin Street, Chang chun 130025, PR ChinaKey Laboratory of Automobile Materials, Ministry of Education, Department of Materials Science and Engineering, Jilin University, No. 5988 Renmin Street, Chang chun 130025, PR ChinaKey Laboratory of Automobile Materials, Ministry of Education, Department of Materials Science and Engineering, Jilin University, No. 5988 Renmin Street, Chang chun 130025, PR ChinaKey Laboratory of Automobile Materials, Ministry of Education, Department of Materials Science and Engineering, Jilin University, No. 5988 Renmin Street, Chang chun 130025, PR ChinaT250 steel is promising maraging steel for the development of ultrahigh strength structural materials due to the reduced cost of losing Co element. Whereas, the ductility of this steel is unsatisfactory owing to its high content of Ti. In this research, high-energy and instantaneous electropulsing is devised to improve the ductility of T250 steel. What's more, the substructure evolution and aging behavior of T250 steel after S (solution) + TA (traditional aging) and S + EPA (electropulsing treated followed with air cooling) treatment are systematically investigated by Transmission Electron Microscope (TEM) characterization, Atom Probe Technology (APT), Finite Element Modelling (FEM) simulation and Electron Back-Scattered Diffraction (EBSD) technology. It is found that unlike S + TA sample, the S + EPA sample consists of Ni3(Ti,Al) clusters, Ni2.67Ti1.33 phase and NiTi phase, respectively, which have different morphologies and sizes caused by their diverse enthalpies of formation and the thermal effect induced by the different conductivity. Furthermore, a great quantity of sub-grain boundaries, relatively considerable α variants and higher schmid factors are detected in S + EPA sample. Consequently, the higher ultimate strength (1855 MPa, 4.4% higher than S + TA sample) with better ductility (15.1%, 23.7% higher than S + TA sample) is obtained. Keywords: T250 maraging steel, Mechanical properties, Electropulsing treatment, Aging behavior, Atom probe tomographyhttp://www.sciencedirect.com/science/article/pii/S0264127519301236 |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Dong Pan Yuguang Zhao Xiaofeng Xu Yitong Wang Wenqiang Jiang Xueying Chong |
spellingShingle |
Dong Pan Yuguang Zhao Xiaofeng Xu Yitong Wang Wenqiang Jiang Xueying Chong A novel strengthening and toughening strategy for T250 maraging steel: Cluster-orientation governed higher strength-ductility combination induced by electropulsing Materials & Design |
author_facet |
Dong Pan Yuguang Zhao Xiaofeng Xu Yitong Wang Wenqiang Jiang Xueying Chong |
author_sort |
Dong Pan |
title |
A novel strengthening and toughening strategy for T250 maraging steel: Cluster-orientation governed higher strength-ductility combination induced by electropulsing |
title_short |
A novel strengthening and toughening strategy for T250 maraging steel: Cluster-orientation governed higher strength-ductility combination induced by electropulsing |
title_full |
A novel strengthening and toughening strategy for T250 maraging steel: Cluster-orientation governed higher strength-ductility combination induced by electropulsing |
title_fullStr |
A novel strengthening and toughening strategy for T250 maraging steel: Cluster-orientation governed higher strength-ductility combination induced by electropulsing |
title_full_unstemmed |
A novel strengthening and toughening strategy for T250 maraging steel: Cluster-orientation governed higher strength-ductility combination induced by electropulsing |
title_sort |
novel strengthening and toughening strategy for t250 maraging steel: cluster-orientation governed higher strength-ductility combination induced by electropulsing |
publisher |
Elsevier |
series |
Materials & Design |
issn |
0264-1275 |
publishDate |
2019-05-01 |
description |
T250 steel is promising maraging steel for the development of ultrahigh strength structural materials due to the reduced cost of losing Co element. Whereas, the ductility of this steel is unsatisfactory owing to its high content of Ti. In this research, high-energy and instantaneous electropulsing is devised to improve the ductility of T250 steel. What's more, the substructure evolution and aging behavior of T250 steel after S (solution) + TA (traditional aging) and S + EPA (electropulsing treated followed with air cooling) treatment are systematically investigated by Transmission Electron Microscope (TEM) characterization, Atom Probe Technology (APT), Finite Element Modelling (FEM) simulation and Electron Back-Scattered Diffraction (EBSD) technology. It is found that unlike S + TA sample, the S + EPA sample consists of Ni3(Ti,Al) clusters, Ni2.67Ti1.33 phase and NiTi phase, respectively, which have different morphologies and sizes caused by their diverse enthalpies of formation and the thermal effect induced by the different conductivity. Furthermore, a great quantity of sub-grain boundaries, relatively considerable α variants and higher schmid factors are detected in S + EPA sample. Consequently, the higher ultimate strength (1855 MPa, 4.4% higher than S + TA sample) with better ductility (15.1%, 23.7% higher than S + TA sample) is obtained. Keywords: T250 maraging steel, Mechanical properties, Electropulsing treatment, Aging behavior, Atom probe tomography |
url |
http://www.sciencedirect.com/science/article/pii/S0264127519301236 |
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