Solidification Structure Refinement of SUS430 Ferritic Stainless Steel by Electric Current Pulse

2012 ◽  
pp. 135-141
Author(s):  
Xin Cao ◽  
Zhenxing Yin ◽  
Yufeng Cheng ◽  
Renxing Li ◽  
Yongyong Gong ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Electric Current ◽  
Current Pulse ◽  
Ferritic Stainless Steel ◽  
Structure Refinement ◽  
Solidification Structure ◽  
Electric Current Pulse

Electric Current Pulse Welding of Titanium with 18-10 Stainless Steel

2009 ◽  
Vol 83-86 ◽  
pp. 1251-1253 ◽  
Author(s):  
E.G. Grigoryev ◽  
V.N. Bazanov
Keyword(s):  
Stainless Steel ◽  
Electric Current ◽  
Current Pulse ◽  
Contact Zone ◽  
Welded Joints ◽  
High Speed ◽  
Welded Joint ◽  
Electric Current Pulse ◽  
Pulse Effect ◽  
Different Thickness

The purpose of the work was to determine the capabilities of the pulse effect of electric current and pressure to produce welded joints of various component parts of different thickness from 18-10 stainless steel and titanium. Application of electric current pulses on the surfaces of contacting metallic conductors leads to considerable changes in the surface structure. Depending on the initial state of the surfaces and parameters of the pulse effect this can result in melting without formation of joints, formation of a strong welded joint with characteristics no worse than those of welded metals, and in destruction of the contact zone. A combination of a short electric pulse with simultaneous application of mechanical pressure in the weld zone causes high-speed deformation of the contact zone. The process of joint formation itself does not cause any appreciable diffusion during welding. The greatest energy emission and the maximal heating occur on the contacting surfaces being welded with the passage of an electric current pulse through the welding zone. Simultaneously with intensive heating, and due to applied pressure, high-speed deformation of materials takes place and a strong welded joint is formed. Optimal parameters for the welding of titanium and 18-10 stainless steel have been determined on the basis of the tests conducted. Investigations into the welding of titanium and 18-10 stainless steel have shown that application of a short electric current pulse and pressure produces stronger welded joints composed of both similar and different metals of considerably different thickness.

Improvement of pitting corrosion resistance of stainless steel by electric current pulse

2017 ◽  
Vol 33 (12) ◽  
pp. 1417-1420 ◽  
Author(s):  
D. B. Jia ◽  
W. B. Dai ◽  
G. P. Tang ◽  
C. Z. Xu ◽  
X. Z. Tian ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Corrosion Resistance ◽  
Electric Current ◽  
Current Pulse ◽  
Pitting Corrosion ◽  
Electric Current Pulse ◽  
Pitting Corrosion Resistance

Microstructure Refinement of Hypereutectic High Chromium Cast Iron with Electric Current Pulse

2013 ◽  
Vol 690-693 ◽  
pp. 147-152 ◽  
Author(s):  
Hua Chen ◽  
Ling Zhang ◽  
Sheng Ming Wang
Keyword(s):  
Cast Iron ◽  
Electric Current ◽  
Current Pulse ◽  
Pulse Frequency ◽  
Solidification Structure ◽  
Electric Current Pulse ◽  
Electric Voltage ◽  
High Chromium ◽  
High Chromium Cast Iron ◽  
Chromium Cast Iron

The effect of electric current pulse (ECP) on the solidification structure of hypereutectic high chromium cast iron was studied. The orthogonal array L9 was used to determine the effect of three process parameters of ECP, which were electric voltage, pulse frequency, pulse width. According to the experimental results, the solidification structure of hypereutectic high chromium cast iron was modified from large grains to finer grains with equiaxed crystals, by allowing the ECP to act on liquid.

Refining mechanism of the electric current pulse on the solidification structure of pure aluminum

2007 ◽  
Vol 55 (9) ◽  
pp. 3103-3109 ◽  
Author(s):  
Xiliang Liao ◽  
Qijie Zhai ◽  
Jun Luo ◽  
Wenjie Chen ◽  
Yongyong Gong
Keyword(s):  
Electric Current ◽  
Current Pulse ◽  
Pure Aluminum ◽  
Solidification Structure ◽  
Electric Current Pulse

Refinement of inclusions in molten steel by electric current pulse

2015 ◽  
Vol 31 (13) ◽  
pp. 1555-1559 ◽  
Author(s):  
W. B. Dai ◽  
J. K. Yu ◽  
C. M. Du ◽  
L. Zhang ◽  
X. L. Wang
Keyword(s):  
Electric Current ◽  
Current Pulse ◽  
Molten Steel ◽  
Electric Current Pulse

scholarly journals Effect of Electric Current Pulse on Microstructure and Corrosion Resistance of Hypereutectic High Chromium Cast Iron

Materials ◽  
2018 ◽  
Vol 11 (11) ◽  
pp. 2220 ◽  
Author(s):  
Haiyang Lv ◽  
Rongfeng Zhou ◽  
Lu Li ◽  
Haitao Ni ◽  
Jiang Zhu ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Cast Iron ◽  
Electric Current ◽  
Current Pulse ◽  
Electric Current Pulse ◽  
High Chromium ◽  
High Chromium Cast Iron ◽  
Microcrack Propagation ◽  
Primary Carbides ◽  
Chromium Cast Iron

The effect of electric current pulse on the microstructure and corrosion resistance of hypereutectic high chromium cast iron was explored. The morphology of carbides in solidification microstructure was observed by an optical microscope and a scanning electron microscope and the composition was determined by an electron probe micro-analyzer. The microhardness of primary carbides and corrosion resistance of samples were also compared. Under the active of electric current pulse, the microstructure of hypereutectic high chromium cast iron was homogenized and its performance improved accordingly. On treatment by electric current, the morphology of primary carbides changed from thick long rods to hexagonal blocks or granular structures. The interlayer spacing of eutectic carbide decreased from ~26.3 μm to ~17.8 μm. Size statistics showed that the average diameter of primary carbide decreased from ~220 μm to ~60 μm. As a result, microhardness increased from 1412 HV to 1511 HV. No obvious microcrack propagation was found at the microindentation sites. The average length of microcracks decreased from ~20.7 μm to ~5.7 μm. Furthermore, corrosion resistance was remarkably enhanced. The average corrosion rate decreased from 2.65 mg/cm2·h to 1.74 mg/cm2·h after pulse current treatment.

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