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

2006 ◽  
Vol 249 ◽  
pp. 147-154 ◽  
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.

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

2010 ◽  
Vol 97-101 ◽  
pp. 1352-1355
Author(s):  
Xin Min Fan ◽  
Fei Yan Liu ◽  
Jie Wen Huang
Keyword(s):  
Surface Layer ◽  
Carbon Steel ◽  
High Speed ◽  
Pure Titanium ◽  
Low Carbon Steel ◽  
Coarse Grained ◽  
Commercially Pure Titanium ◽  
Low Carbon ◽  
Cross Sectional ◽  
Average Grain Size

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.

Low carbon steel with nanostructured surface layer induced by high-energy shot peening

2001 ◽  
Vol 44 (8-9) ◽  
pp. 1791-1795 ◽  
Author(s):  
G Liu ◽  
S.C Wang ◽  
X.F Lou ◽  
J Lu ◽  
K Lu
Keyword(s):  
Surface Layer ◽  
Carbon Steel ◽  
Shot Peening ◽  
Low Carbon Steel ◽  
High Energy ◽  
Low Carbon ◽  
Nanostructured Surface

scholarly journals Evaluation of induced residual stresses on AISI 1020 low carbon steel plate from experimental and FEM approach during TIG welding process

2019 ◽  
Vol 13 (1) ◽  
pp. 4415-4433
Author(s):  
I. B. Owunna ◽  
A. E. Ikpe
Keyword(s):  
Carbon Steel ◽  
Residual Stresses ◽  
Steel Plate ◽  
Low Carbon Steel ◽  
Welding Process ◽  
Service Condition ◽  
Tig Welding ◽  
Von Mises Stress ◽  
Low Carbon ◽  
Temperature Range

Induced residual stresses on AISI 1020 low carbon steel plate during Tungsten Inert Gas (TIG) welding process was evaluated in this study using experimental and Finite Element Method (FEM). The temperature range measured from the welding experimentation was 251°C-423°C, while the temperature range measured from the FEM was 230°C-563°C; whereas, the residual stress range measured from the welding experimentation was 144MPa-402Mpa, while the residual range measured from the FEM was 233-477MPa respectively. Comparing the temperature and stress results obtained from both methods, it was observed that the range of temperature and residual stresses measured were not exactly the same due to the principles at which both methods operate but disparities between the methods were not outrageous. However, these values can be fed back to optimization tools to obtain optimal parameters for best practices.  Results of the induced stress distribution was created from a static study where the thermal results were used as loading conditions and it was observed that the temperature increased as the von-Mises stress increased, indicating that induced stresses in welded component may hamper the longevity of such component in service condition. Hence, post-weld heat treatment is imperative in order to stress relieve metals after welding operation and improve their service life.

Formation of the surface layer on a low-carbon steel in electrospark treatment

2013 ◽  
Vol 27 (11) ◽  
pp. 903-906 ◽  
Author(s):  
V.I. Ivanov ◽  
F.Kh. Burumkulov ◽  
A.D. Verkhoturov ◽  
P.S. Gordiyenko ◽  
Ye.S. Panin ◽  
...  
Keyword(s):  
Surface Layer ◽  
Carbon Steel ◽  
Low Carbon Steel ◽  
Low Carbon ◽  
Electrospark Treatment
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