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.

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.

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.

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.

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.

Effect of Magnetic Field on Microstructure and Properties of Magnesium Alloy Welded Joint with GTAW

2011 ◽  
Vol 189-193 ◽  
pp. 3507-3510 ◽  
Author(s):  
Yun Hai Su ◽  
Zheng Jun Liu ◽  
Duo Liu
Keyword(s):  
Magnetic Field ◽  
Magnesium Alloy ◽  
Longitudinal Magnetic Field ◽  
Welded Joint ◽  
Hardness Test ◽  
Fine Crystal ◽  
Microstructure And Properties ◽  
Pine Tree ◽  
Acting Mechanism ◽  
Optimal Mechanical Property

In this investigation, in order to research the influence of magnetic field on microstructure and properties of magnesium alloy welded joint, the AZ31 magnesium alloy plates which was 5mm were welded by GTAW under longitudinal magnetic field. The tensile test, hardness test and SEM were taken place to analyze the properties and microstructure of welded joint under different magentic field parameters. The acting mechanism of magentic field on welded joint was studied. The results show that: External magnetic field can improve the properties of magnesium alloy welded joint which is welded by GTAW. The optimal mechanical property will be obtained when Im=2, f=20Hz, which the ultimate tensile strength is 231Mpa and the micro-hardness is 76.2HV.The magnetic field can produce electromagnetic stirring, which can refine crystal grain through breaking the pine-tree crystals with proper magnetic field current and frequency. The properties of welded joint will been improved by these fine crystal grain.

Numerical study of the effect of transverse magnetic field on cylindrical and hemispherical CZ crystal growth of silicon

2010 ◽  
Vol 46 (4) ◽  
pp. 393-402 ◽  
Author(s):  
F. Mokhtari ◽  
A. Bouabdallah ◽  
A. Merah ◽  
S. Hanchi ◽  
A. Alemany
Keyword(s):  
Magnetic Field ◽  
Crystal Growth ◽  
Transverse Magnetic Field ◽  
Numerical Study ◽  
Transverse Magnetic
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