Publications by authors named "Jianhang Feng"

3 Publications

  • Page 1 of 1

The Effect of Ni Interlayer on the Hot-Rolled and Quenched Stainless Steel Clad Plate.

Materials (Basel) 2020 Nov 30;13(23). Epub 2020 Nov 30.

TianJin Key Laboratory of Materials Laminating Fabrication and Interfacial Controlling Technology, Research Institute for Energy Equipment Materials, School of Materials Science and Engineering, Hebei University of Technology, Tianjin 300132, China.

The vacuum hot-rolled SUS314/Q235 stainless steel clad plate has many drawbacks including serious interface alloy element diffusion, stainless steel cladding's sensitization, and carbon steel substrate's low strength. In this study, the comprehensive properties were systematically adjusted by changing the thickness of the Ni interlayer (0, 100, 200 μm) and the quenching temperature (1000~1150 °C). The results showed that the Ni interlayer can obviously hinder the diffusion of carbon element, so as to achieve the purpose of eliminating the decarburized layer and reducing the carbon content of the carburized layer. Meanwhile, the perfect metallurgical bonding between the substrate and cladding can be obtained, effectively improving the stainless steel clad plate's tensile shear strength and comprehensive mechanical properties, and significantly reduce the brittleness of the carburized layer. As the quenching temperature increases, the grains coarsening of carbon steel and stainless steel became more and more serious, and the sensitization phenomenon and the thickness of the carburized layer are gradually decreased. The stainless steel clad plate (Ni layer thickness of 100 μm) quenched at 1050 °C had the best comprehensive mechanical properties. Herein, the interface shear strength, tensile strength and the fracture elongation reached 360.5 MPa, 867 MPa and 16.10%, respectively, achieving strengthening and toughening aim. This is attributed to the disappearance of the sensitization phenomenon, the grain refinement and the lower interface residual stress.
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http://dx.doi.org/10.3390/ma13235455DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7729896PMC
November 2020

Effect of Oxide Particles on Microstructure and Mechanical Properties of the 45 Carbon Structural Steel.

Materials (Basel) 2020 Mar 9;13(5). Epub 2020 Mar 9.

School of Materials Science & Engineering, Hebei University of Technology, Tianjin 300130, China.

Striking difference in density between the oxide and the steel results in difficulty in preparing oxide dispersion strengthened steel with large size parts or materials. In this research, AlO and TiO particles were initially milled with the 20 steel, and then the mixture was heated to a molten state to form a master alloy, which was used as a raw material for further preparation of the object steel. It was found that homogeneous distribution of the oxide particles was obtained in the mass production of the steel. Moreover, the obtained 45 carbon structural steel presents fine microstructures, together with improved mechanical properties, especially the impact ductility. This should be attributable to the transformation from the introduced micro-size oxide particles to the nano ones, which act as heterogeneous nucleants that play an important role in grain refinement and dispersion strengthening for the steel, during the remelting of the master alloy.
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http://dx.doi.org/10.3390/ma13051232DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7085093PMC
March 2020

A New Ultra-High-Strength AB83 Alloy by Combining Extrusion and Caliber Rolling.

Materials (Basel) 2020 Feb 5;13(3). Epub 2020 Feb 5.

School of Materials Science and Engineering, Hebei University of Technology, Tianjin 300130, China.

An exceptionally high-strength rare-earth-free Mg-8Al-3Bi (AB83) alloy was successfully fabricated via extrusion and caliber rolling. After three-pass caliber rolling, the homogenous microstructure of the as-extruded AB83 alloy was changed to a necklace-like bimodal structure consisting of ultra-fine dynamic recrystallized (DRXed) grains and microscale deformed grains. Additionally, both MgAl and MgBi nanoprecipitates, undissolved microscale MgAl, and MgBi particles were dispersed in the matrix of caliber-rolled (CRed) AB83 alloy. The CRed AB83 sample demonstrated a slightly weakened basal texture, compared with that of the as-extruded sample. Consequently, CRed AB83 showed a tensile yield strength of 398 MPa, an ultimate tensile strength of 429 MPa, and an elongation of 11.8%. The superior mechanical properties of the caliber-rolled alloy were mainly originated from the combined effects of the necklace-like bimodal microstructure containing ultra-fine DRXed grains, the homogeneously distributed nanoprecipitates and microscale particles, as well as the slightly modified basal texture.
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http://dx.doi.org/10.3390/ma13030709DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7040910PMC
February 2020
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