Superior mechanical properties and deformation mechanisms of a 304 stainless steel plate with gradient nanostructure

Sun, Yiping; Kong, Xiang-Shan; Wang, Z.B

doi:10.1016/j.ijplas.2022.103336

Cited by 49 publications

(3 citation statements)

References 76 publications

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“…The co-deformation of the fine grains at the surface and the coarse grains within delayed the occurrence of necking. The tensile strength and plasticity increased with the rolling load while the residual stress decreased [31]. A HAM process coupled with in-situ micro-rolling was developed by Zhang et al [22,[32][33][34] by adding a roller after the welding torch to realize the warm rolling of the deposited material.…”

Section: In-situ Rolling Assisted Ldedmentioning

confidence: 99%

Hybrid directed energy deposition process coupled with plastic deformation

Yang,

Wang,

et al. 2024

J. Phys.: Conf. Ser.

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Laser directed energy deposition (LDED) process has unique advantage in rapid forming of large-sized metal components, gradient material/structural components, or repairing/remanufacturing worn parts. However, the high residual stress and strong anisotropy in mechanical properties of the as-deposit components limit the application of LDED technology in the manufacturing of key structural components. To overcome these problems, various hybrid additive manufacturing (HAM) technologies have been developed, such as plastic deformation, ultrasonic or magnetic field assisted LDED processes to improve the quality and the mechanical properties, where these coupled processes are carried out either simultaneously or cyclically with the LDED process. The hybrid additive manufacturing, while retaining the advantages of individual forming process, avoids the mutual interference between each process and reducing the adverse effects generated if used separately. Hybrid additive manufacturing processes fundamentally change the underlying physical mechanisms of molten pool dynamics, microstructural evolution, temperature and thermal stress gradient in additive manufacturing, thereby optimizing the microstructure and performance of the manufactured components. In this paper, the key technical features of the hybrid additive manufacturing process coupled with plastic deformation were described in details, and the resulting differences in microstructure, residual stress, and mechanical properties of the prepared samples were systematically analyzed. The developing trend of hybrid additive manufacturing processes in coupling mechanisms, parameter optimization, and equipment have been discussed.

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Section: In-situ Rolling Assisted Ldedmentioning

confidence: 99%

Hybrid directed energy deposition process coupled with plastic deformation

Yang,

Wang,

et al. 2024

J. Phys.: Conf. Ser.

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“…Therefore, improving its mechanical and corrosion properties has always been of great interest to researchers and industry. In recent years, many metal materials with a heterogeneous structure (HS) have successfully overcome the trade-off between strength and ductility, and exhibit superior mechanical properties [6][7][8]. The outstanding mechanical properties of heterostructured materials are attributed to the interaction coupling between two regions with different mechanical properties (named soft and hard regions) coexisting in the same microstructure.…”

Section: Introductionmentioning

confidence: 99%

Heterogeneous Microstructure Provides a Good Combination of Strength and Ductility in Duplex Stainless Steel

Yang,

Li,

et al. 2024

Metals

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SAF2507 duplex stainless steel (DSS) is often used as a structural component in ocean-going vessels and marine petroleum exploitation equipment, which require superior mechanical properties. In this study, we used cold rolling (CR) at room temperature with 55% or 80% deformation amounts and subsequent annealing at 1273 K in 1 min to prepare SAF2507 samples with a heterogeneous structure (HS) that was composed of ferrite and austenite phases with different grain sizes. Compared with the homogeneous structure samples, the yield strength of the HS samples increased, while the ductility did not decrease. The 55%-1273 and 80%-1273 samples exhibited the hetero-zone boundary-affected regions on both sides of the grain boundary, phase boundary, and twin boundary. This resulted in hetero-deformation-induced (HDI) strengthening and strain hardening of samples during tensile deformation, which improved the ultimate tensile strength of the HS samples while maintaining a good uniform elongation. In addition, the heterogeneous structure of DSS had better corrosion resistance than the initial sample of coarse grain (CG) structure; mainly because the HS samples had finer grains and more grain boundaries on the DSS surface than the CG structure, which is conducive to the formation of high-density passivation film on the surface of stainless steel. The current study provides a new method of material selection of some structural components with the demands of high strength and good ductility.

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“…Constructing gradient nanostructures (GNSs) have been proven to be a good strategy for enhancing the mechanical properties of metals and alloys inspired by nature [1,2]. Over the past two decades, this strategy has been successfully applied in almost all types of structural metallic materials [3][4][5][6][7], such as Cu and Cu alloys [8,9], Mg alloys [10,11], and Ti alloys [12,13]. Several methods have been developed to prepare the gradient nanostructure, such as surface mechanical grinding treatment (SMGT) [3], surface mechanical attrition treatment (SMAT) [14], surface mechanical rolling treatment (SMRT) [15], laser shock peening (LSP) [16], ultrasonic surface rolling (USR), or ultrasonic nanocrystalline surface modification (UNSM) [17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Mechanical Properties of Gradient Nanostructured Q345 Steel Prepared by Ultrasonic Severe Surface Rolling

Meng

Feng

et al. 2023

Scanning

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In this work, ultrasonic severe surface rolling (USSR), a new surface nanocrystallization technique, is used to prepare gradient nanostructure (GNS) on the commercial Q345 structural steel. The microstructure of the GNS surface layer is characterized by employing EBSD and TEM, and the result indicates that a nanoscale substructure is formed at the topmost surface layer. The substructures are composed of subgrains and dislocation cells and have an average size of 309.4 nm. The GNS surface layer after USSR processing for one pass has a thickness of approximately 300 μm. The uniaxial tensile measurement indicates that the yield strength of the USSR sample improves by 25.1% compared to the as-received sample with slightly decreased ductility. The nanoscale substructure, refined grains, high density of dislocations, and hetero-deformation-induced strengthening are identified as responsible for the enhanced strength. This study provides a feasible approach to improving the mechanical properties of structural steel for wide applications.

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Superior mechanical properties and deformation mechanisms of a 304 stainless steel plate with gradient nanostructure

Cited by 49 publications

References 76 publications

Hybrid directed energy deposition process coupled with plastic deformation

Hybrid directed energy deposition process coupled with plastic deformation

Heterogeneous Microstructure Provides a Good Combination of Strength and Ductility in Duplex Stainless Steel

Microstructure and Mechanical Properties of Gradient Nanostructured Q345 Steel Prepared by Ultrasonic Severe Surface Rolling

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