Microstructures and Properties of Co-Based Alloy Surfacing Layer with Longitudinal Magnetic Field

2010 ◽  
Vol 154-155 ◽  
pp. 1271-1274
Author(s):  
Yun Hai Su ◽  
Zheng Jun Liu ◽  
Ming Su
Keyword(s):  
Magnetic Field ◽  
Wear Resistance ◽  
Longitudinal Magnetic Field ◽  
Low Carbon Steel ◽  
Xrd Analysis ◽  
Wear Loss ◽  
Low Carbon ◽  
Dc Magnetic Field ◽  
Optimal Values ◽  
The Magnetic Field

In order to systematically study the influence of surfacing current and magnetic field current on hardness and wear resistance of surfacing layer, longitudinal DC magnetic field was applied during plasma arc surfacing Co-based alloy on low-carbon steel. The hardness, wear resistance, microstructure and phase constitution of the surfacing layer were investigated through the tests of hardness, wear, SEM and XRD analysis. The results show that the surfacing current and magnetic field current must be matched properly to achieve the optimal properties of surfacing layer. The optimal values are obtained when the surfacing current is 160A and the magnetic field current is 3A, where the hardness is 43.7 HRC and the wear loss is 0.5493g. The proper electromagnetic stirring induced by electromagnetic field can not only refine the microstructure but also improve the hardness and wear resistance of the surfacing layer.

Comparison of Microstructure and Properties of Ni-Based Overlay Deposit under Longitudinal Magnetic Field and Transverse Magnetic Field

2012 ◽  
Vol 557-559 ◽  
pp. 1742-1746 ◽  
Author(s):  
Zheng Jun Liu ◽  
Duo Liu ◽  
Chang Jun Liu
Keyword(s):  
Magnetic Field ◽  
Transverse Magnetic Field ◽  
Longitudinal Magnetic Field ◽  
Low Carbon Steel ◽  
Hardness Test ◽  
Transverse Magnetic ◽  
Wear Loss ◽  
Plasma Arc ◽  
Low Carbon ◽  
Microstructure And Properties

plasma arc sufacing； magnetic field style ；Ni-based alloy；microstructure and properties Abstract. The Ni60 alloy was overlaid on low carbon steel by plasma arc surfacing with Longitudinal magnetic field or transverse magnetic field. The magnetic field current and surfacing current could been changed during surfacing. After plasma arc surfacing with magnetic field, the XRD, wear loss tes, micro-hardness test were used to analyze the effect of magnetic field style on properties of overlay deposit. The acting mechanism of magnetic field style and parameters on properties and microstructure of overlay deposit was researched. The results indicate that longitudinal magnetic field and transverse magnetic field all can improve the properties of overlay deposit, but give little effectives intervention to the process parameters. The active effect of transverse magnetic field is better than longitudinal magnetic field because of transverse magnetic field can make the microstructure finer, component more uniform.

Research on the Microstructure and Performance of Co-Based Alloy Surfacing Layer

2013 ◽  
Vol 652-654 ◽  
pp. 1886-1891 ◽  
Author(s):  
Hong Mei Wang ◽  
Chang Jun Liu
Keyword(s):  
Magnetic Field ◽  
Wear Resistance ◽  
Transverse Magnetic Field ◽  
Low Carbon Steel ◽  
Welding Current ◽  
Hardness Test ◽  
Xrd Analysis ◽  
Transverse Magnetic ◽  
Low Carbon ◽  
Magnetic Current

With the help of applying the welding method of DC transverse magnetic field plasma arc surfacing, the powder of Co-based alloy is built up welding on surface of low carbon steel, the refinement effect of primary and secondary crystal structure inflicted by the magnetic field is confirmed through hardness test, wear resistance test, metallographic test and XRD analysis. And study systematically the law of DC transverse magnetic field influencing the surfacing layer metal hardness and wear resistance. The results show that the mechanical properties of surfacing layer achieve the best value when appropriate overlaying welding current match with magnetic current. "Magnetic blow" can be improved with the addition of transverse magnetic field, improving the stability of overlaying welding arc process.

Microstructure and Properties under Alternating Magnetism after Hot Rolling

2014 ◽  
Vol 1004-1005 ◽  
pp. 1256-1259
Author(s):  
Shen Bai Zheng ◽  
Shi Jie Liu ◽  
Hong Bin Li ◽  
Bin Feng ◽  
Xue Song Hui
Keyword(s):  
Magnetic Field ◽  
Carbon Steel ◽  
Cold Rolling ◽  
Grain Growth ◽  
Hot Rolling ◽  
Magnetic Field Intensity ◽  
Raw Materials ◽  
Low Carbon Steel ◽  
Low Carbon ◽  
The Magnetic Field

The austenite steel after rolling was radiated by the alternating magnetism, and the effects that alternating magnetic on the austenite transition was studied. The result shows that the alternating magnetism promotes the austenitic grain growth of low carbon steel. If the magnetic field intensity is increased, it could provide better performance of raw materials to cold rolling processing.

Metal-matrix composite fabricated with gas tungsten arc melt injection and precoated with NiCrBSi alloy to increase the volume fraction of WC particles

2017 ◽  
Vol 24 (2) ◽  
pp. 195-202 ◽  
Author(s):  
Aiguo Liu ◽  
Da Li ◽  
Fanling Meng ◽  
Huanhuan Sun
Keyword(s):  
Wear Resistance ◽  
Metal Matrix ◽  
Volume Fraction ◽  
Low Carbon Steel ◽  
High Volume ◽  
Wear Loss ◽  
Low Carbon ◽  
Gas Tungsten Arc ◽  
The Matrix ◽  
Gas Tungsten

AbstractThe volume fraction, dissolution, and segregation of WC particles in metal-matrix composites (MMCs) are critical to their wear resistance. Low carbon steel substrates were precoated with NiCrBSi coatings and processed with gas tungsten arc melt injection method to fabricate MMCs with high volume fraction of WC particles. The microstructures and wear resistance of the composites were investigated. The results showed that the volume fraction of WC particles increased with decreasing hopper height and was as high as 44% when hopper height was 100 mm. The dissolution of WC particles was minimal. The content of the alloying elements decreased from the top to the bottom of the matrix. More WC particles dissolved in the overlapping area, where Fe3W3C carbide blocks could be found. The wear loss of the MMCs after 40 min was 6.9 mg, which is 76 times less than that of the substrate after the 4 min test.

Droplet Transfer and Microstructure of Q235 Steel Thick Plate Using CO2 Welding with Additional Longitudinal Magnetic Field Controlling

2010 ◽  
Vol 102-104 ◽  
pp. 451-454
Author(s):  
Qian Luo ◽  
Duan Min Lu ◽  
Jian Luo
Keyword(s):  
Magnetic Field ◽  
Thick Plate ◽  
Longitudinal Magnetic Field ◽  
Low Carbon Steel ◽  
Welding Process ◽  
Low Carbon ◽  
Droplet Transfer ◽  
Welding Seam ◽  
Co2 Welding ◽  
Welding Joints

In this paper, a new welding experiment is studied by applying an additional longitudinal electromagnetic field to CO2 welding process (abbr. LEM-CO2 welding).The characteristics of droplet transfer, macrostructure and microstructure are compared between LEM- CO2 welding and general CO2 welding on Q235 low carbon steel thick plate joint. The research results shows that, an additional longitudinal magnetic field can have a significant effect on properties of the droplet transfer in CO2 welding, the frequency and stability of the droplet transfer in LEM-CO2 welding are improved. The grains of welding seam are refined and welding joints has a higher quality. So the additional longitudinal magnetic field is a very simple and effective method to improve the properties of CO2 welding thick plate joint.

Comparison of Microstructure and Properties of Co-Based Overlay Deposit under Longitudinal Magnetic Field and Transverse Magnetic Field

2012 ◽  
Vol 557-559 ◽  
pp. 1747-1751 ◽  
Author(s):  
Zheng Jun Liu ◽  
Duo Liu ◽  
Xiao Juan Wu
Keyword(s):  
Magnetic Field ◽  
Low Carbon Steel ◽  
Hardness Test ◽  
Transverse Magnetic ◽  
Wear Loss ◽  
Second Phase ◽  
Plasma Arc ◽  
Low Carbon ◽  
Matrix Metal ◽  
Microstructure And Properties

The StelliteNo6 alloy was surfaced on low carbon steel by plasma arc surfacing with LMF or TMF. The magnetic field current could been changed during surfacing. After plasma arc surfacing with magnetic field, the OM, XRD, wear loss test, micro-hardness test were used to analyze the effect of magnetic field style on microstructure and properties of overlay deposit. The acting mechanisms of magnetic field style and parameters on properties and microstructure of overlay deposit were researched. The results indicate that LMF and TMF all can improve the properties of overlay deposit. The active effect of TMF is better than LMF because of TMF can make the matrix metal γ-Co finer, second phase (CoCx、Cr7C3、Cr23C and FeNi) dispersion.

Effect of Austenite Transition under Pulsating Magnetism

2013 ◽  
Vol 634-638 ◽  
pp. 1704-1707
Author(s):  
Shen Bai Zheng ◽  
Shao Hui Pan ◽  
Hui Wen ◽  
Xiaog Xiong Wang
Keyword(s):  
Magnetic Field ◽  
Carbon Steel ◽  
Cold Rolling ◽  
Grain Growth ◽  
Magnetic Field Intensity ◽  
Raw Materials ◽  
Low Carbon Steel ◽  
Intermediate Frequency ◽  
Low Carbon ◽  
The Magnetic Field

The austenite steel was radiated by the intermediate frequency pulsating magnetism, and the effects that pulsating magnetic on the austenite transition was studied. The result shows that the pulsating magnetism promotes the austenitic grain growth of low carbon steel. If the magnetic field intensity is increased, it could provide better performance of raw materials to cold rolling processing.

scholarly journals MAGNETIC FIELD SHIELDING OF UNDERGROUND POWER CABLE LINE BY H-SHAPED SHIELD

2020 ◽  
Vol 2020 (6) ◽  
pp. 15-20
Author(s):  
I.M. Kucheriava ◽  
Keyword(s):  
Magnetic Field ◽  
Low Carbon Steel ◽  
Power Cable ◽  
Low Carbon ◽  
Shielding Effectiveness ◽  
Cable Line ◽  
Three Phase ◽  
Underground Power Cable ◽  
Extra High Voltage ◽  
The Magnetic Field

In the article the magnetic field distributions, generated by underground extra-high voltage (330 kV) three-phase power cable line in the environment, in particular near the cables in the trench and on the ground, are analyzed for using of H-shaped shield made of different materials including aluminum, low carbon steel and non-oriented grain steel. As shown, the best shielding effectiveness is realized by aluminium shield. The H-shaped shield made of high-conducting non-magnetic materials is proposed to use in order to mitigate the magnetic field level on the ground down to regulated nonhazardous values. References 14, figures 7.

scholarly journals Arc Characteristics and Welding Process of Magnetic Field Assisting Plasma-GMAW-P

2021 ◽  
Vol 100 (01) ◽  
pp. 1-12
Author(s):  
JIANG YU ◽  
◽  
HONGTAO ZHANG ◽  
PENG HE ◽  
XIAO YANG ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Gas Flow ◽  
Gas Metal Arc Welding ◽  
Low Carbon Steel ◽  
Welding Process ◽  
Welding Current ◽  
Electrical Signal ◽  
Maximum Temperature ◽  
Low Carbon ◽  
The Magnetic Field

Low-carbon steel Q235B was successfully joined by plasma-pulsed gas metal arc welding (plasma-GMAW-P) with an external magnetic field. The arc profile, temperature field, electrical signal, microstructure, and mechanical properties of this method were analyzed. The results indicated that the coupling degree of the two arcs increased with the strengthening of the magnetic field current. However, when the magnetic field current was greater than 1 A, the arc pro-file changed slightly with the increase of the magnetic field current. Fixed on the magnetic field current, the coupling degree first increased and then decreased with the increase of the plasma welding current, GMAW-P welding current, plasma gas flow rate, and nozzle height, respectively. The maximum temperature had no obvious influence on joint penetration at different magnetic field cur-rents. However, the average temperature had an inverse effect on joint penetration at different magnetic field currents. The weld fusion zone joint tensile test results showed that the ratio of depth to width increased with the application of magnetic field currents. Moreover, tensile strength on the upper and lower part of the tensile samples were 521 and 488 MPa, respectively, which were 4.6% and 3.2% higher than those without the magnetic field. The microhardness of the weld joints was higher than that without the magnetic field.

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