Nanostructured Surface Layers In Low Carbon Steel and Pure Titanium Induced By High-Speed Rotating Wire-Wheel Deformation

A nanostructure surface layer was produced on low carbon steel and commercially pure titanium using high-speed rotating wire-wheel deformation (HRWD). The microstructural features of the surface layer were systematically characterized by cross-sectional optical microcopy observations, transmission electron microscopy, and microhadness measurement was conducted along the depth from top surface layer to matrix of the samples. The results show that nearly equiaxed nanocrystalline layer is formed on the surface of the low carbon steel and pure titanium, in which the average grain size is about 8 nm and 15 nm respectively. The microhardness of the top surface is enhanced obviously compared with that of the coarse-grained matrix.

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Effect of Annealing Temperature on Microstructure and Properties of Surface Nanocrystalline Structure in Low Carbon Steel Specimen

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.353-358.1601 ◽

2007 ◽

Vol 353-358 ◽

pp. 1601-1604

Author(s):

Xin Min Fan ◽

Yan Jiao Ji ◽

Jie Wen Huang

Keyword(s):

Surface Layer ◽

Carbon Steel ◽

Annealing Temperature ◽

Low Carbon Steel ◽

Nanocrystalline Structure ◽

Low Carbon ◽

Steel Cylinder ◽

Surface Nanocrystallization ◽

Microstructure And Properties ◽

Average Grain Size

Nanostructure surface layer was fabricated on a low carbon steel cylinder specimen by means of circulation rolling plastic deformation (CRPD), and the effect of annealing temperature on microstructure and properties of surface nanocrystalline structure was studied. The microstructure of the surface layer on the samples was observed by transmission electron microscopy and the microhardness variation along the depth was measured on the cross-sectional samples by using microhardness instrument. After CRPD treatment for 250min, the average grain size was about 10nm in the top surface layer and increased with an increment of the distance from the top surface. The surface nanocrystallization samples were annealed at 200°C, 300, 400°C and 500°C for 30min respectively. The nanocrystallization grain of surface layer did not grow for samples after annealed at 200°C and 300°C. After surface nanocrystallization by CRPD treatment the microhadness of top surface obviously increase from 220HV0.1 to 520HV0.1.

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Microstructure and Mechanical Property Analyses of Brazing Titanium and Low Carbon Steel Using Silver-Based Brazing Alloy

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.941-944.169 ◽

2014 ◽

Vol 941-944 ◽

pp. 169-177

Author(s):

Lin Lin Yuan ◽

Jing Tao Han ◽

Jing Liu

Keyword(s):

Shear Strength ◽

Carbon Steel ◽

Pure Titanium ◽

Low Carbon Steel ◽

Fracture Morphology ◽

Considerable Effect ◽

Commercially Pure Titanium ◽

Tensile Shear Strength ◽

Low Carbon ◽

Tensile Shear

Brazing of commercially pure titanium to low carbon steel by using the Ag72Cu28 interlayer at different conditions was carried out in the present work in order to investigate the tensile-shear strength, microstructure and the fracture morphology of brazed joint. The results show that different intermetallic compounds such as CuTi,CuTi2,Cu4Ti3 and FeTi were formed at the bonding area. It was observed that the microstructure of joint has a considerable effect on tensile-shear strength of the brazed samples and the maximum tensile-shear strength was achieved at “750°C-10min→850°C-5min”.All the fracture paths after tensile-shear tests occurred in the interface between titanium and silver-based interlayer in spite of the different fracture morphology.

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Surface Nanocrystallization of Low Carbon Steel Induced by Circulation Rolling Plastic Deformation

Materials Science Forum ◽

10.4028/www.scientific.net/msf.475-479.133 ◽

2005 ◽

Vol 475-479 ◽

pp. 133-136 ◽

Cited By ~ 5

Author(s):

Xin Min Fan ◽

Bosen Zhou ◽

Lin Zhu ◽

Heng Zhi Wang ◽

Jie Wen Huang

Keyword(s):

Plastic Deformation ◽

Grain Size ◽

Surface Layer ◽

Carbon Steel ◽

Severe Plastic Deformation ◽

Low Carbon Steel ◽

Low Carbon ◽

Surface Nanocrystallization ◽

Average Grain Size ◽

The Matrix

In this paper, the circulation rolling plastic deformation(CRPD) surface nanocrystallization technology is proposed based on the idea that the severe plastic deformation can induce grain refinement. The equipment of CRPD is designed and manufactured. A nanocrystallization surface layer was successfully obtained in a column sample of low carbon steel. The average grain size in the top surface layer is about 18 nm, and gradually increases with the distance from the surface. The hardness increases gradually from about 200HV0.1 in the matrix to about 600HV0.1 in the surface layer.

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Diffusion of Cr in Nanostructured Fe and Low Carbon Steel Produced by Means of Surface Mechanical Attrition Treatment

Defect and Diffusion Forum ◽

10.4028/www.scientific.net/ddf.249.147 ◽

2006 ◽

Vol 249 ◽

pp. 147-154 ◽

Cited By ~ 18

Author(s):

Z.B. Wang ◽

N.R. Tao ◽

W.P. Tong ◽

Jian Lu ◽

K. Lu

Keyword(s):

Surface Layer ◽

Carbon Steel ◽

Steel Plate ◽

Low Carbon Steel ◽

Coarse Grained ◽

Surface Mechanical Attrition Treatment ◽

Low Carbon ◽

Triple Junctions ◽

Exponential Factor ◽

Mechanical Attrition

By means of surface mechanical attrition treatment (SMAT), nanostructured (NS) surface layers were fabricated on a pure iron plate and a low carbon steel plate. Cr diffusion behaviors in the NS Fe phase and the SMAT low carbon steel were investigated. Experimental results showed the activation energy of Cr diffusion in the NS Fe is comparable to that of the GB diffusion, but the pre-exponential factor is much higher. A much thicker Cr-diffusion surface layer was obtained in the SMAT low carbon steel plate than in the coarse-grained one after the same chromizing treatment. The much enhanced diffusivities of Cr in the SMAT samples can be attributed to numerous GBs and triple junctions with a high excess stored energy in the NS surface layer.

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