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.

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.

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.

Effect of Uniaxial Stress on Magnetic Permeability and Magnetic Loss of Low-Carbon Steel in Weak Alternating Magnetic Field

2014 ◽  
Vol 678 ◽  
pp. 220-227
Author(s):  
Xiao Yang Li ◽  
Zan Dong Han
Keyword(s):  
Magnetic Field ◽  
Carbon Steel ◽  
Uniaxial Tension ◽  
Magnetic Permeability ◽  
Magnetic Loss ◽  
Low Carbon Steel ◽  
Low Carbon ◽  
Stress Increase ◽  
Magnetic Parameters ◽  
Pressure Stress

The inverse magnetostrictive effect provides a chance to detect the stress by measuring some magnetic parameters. So it is important to learn the effect of stress on some magnetic parameters. A measuring system to measure magnetic permeability and magnetic loss and a device to load uniaxial tension and pressure stress were developed. The result shows that magnetic permeability and magnetic loss increase with uniaxial tension stress increase and decreases with uniaxial pressure stress increase. It is also concluded that the relative change of magnetic permeability and magnetic loss decrease with increase of the included angle between the directions of the stress and magnetic field. These results suggest that magnetic permeability and magnetic loss can be further used to evaluate the stress in low-carbon steel.

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.

Surface Roughness Optimization in End Milling of Stainless Steel AISI 304 with Uncoated WC-Co Insert Under Magnetic Field

2012 ◽  
Vol 576 ◽  
pp. 119-122 ◽  
Author(s):  
A.K.M. Nurul Amin ◽  
Syidatul Akma Sulaiman ◽  
Siti Noor Izzati Mohd Zainun ◽  
M.D. Arif
Keyword(s):  
Magnetic Field ◽  
Surface Roughness ◽  
Magnetic Fields ◽  
Permanent Magnets ◽  
End Milling ◽  
Desirability Function ◽  
Low Carbon Steel ◽  
Machining Process ◽  
Low Carbon ◽  
Novel Approach

Chatter phenomenon is a major issue as it greatly affects the topography of machined parts. Due to the inconsistent character of chatter, it is extremely difficult to predict resultant surface roughness in a machining process, such as end milling. Also, recent studies have shown that chatter can be suitably damped using magnetic fields. This paper, thus, focuses on a novel approach of minimizing surface roughness in end milling of Mild (Low Carbon) Steel using uncoated WC-Co inserts under magnetic field from permanent magnets. In this experiment, Response Surface Methodology (RSM) approach using DESIGN EXPERT 6.0 (DOE) software was used to design the experiments. The experiments were performed under two different cutting conditions. The first one was cutting under normal conditions, while the other was cutting under the application of magnetic fields from two permanent magnets positioned on opposite sides of the cutter. Surface roughness was measured using Mitutoyo SURFTEST SV-500 profilometer. The subsequent analysis showed that surface roughness was significantly reduced (by as much as 67.21%) when machining was done under the influence of magnetic field. The experimental results were then used to develop a second order empirical mathematical model equation for surface roughness and validated to 95% confidence level by using ANOVA. Finally, desirability function approach was used to optimize the surface roughness within the limiting values attainable in end milling.

Characteristics of Deposition Precipitation Process in Production of High Strength and Low Carbon Steel in FTSR

2014 ◽  
Vol 886 ◽  
pp. 128-131
Author(s):  
Zhuo Fei Song ◽  
Shan Shan Feng ◽  
Yun Li Feng
Keyword(s):  
Solid State ◽  
Low Carbon Steel ◽  
High Strength ◽  
Dynamical Analysis ◽  
Precipitation Process ◽  
Second Phase ◽  
Low Carbon ◽  
Second Phase Particles ◽  
Thermodynamics And Dynamics ◽  
Hot Rolled

Precipitation characteristics of second phase in HSLC steel produced by FTSR technology have been researched by TEM and EDS in this article. And preliminary research of precipitation conditions of second phase particles in thermodynamics and dynamics have been took. The results indicate that: there’re second phase particles precipitated dispersively in hot rolled HSLC steels by FTSR technology. These particles mainly contain particles of Al2O3、MnS and AlN. Thermo dynamical analysis declares that most of the Al2O3 and all of the MnS、 AlN particles are precipitated in solid state. That’s why the precipitation process is slowed down by the diffusion velocity of the elements in solid, and thinner particles are precipitated while the material is in solid state than in liquid state.

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.

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