The Influence of Alloying Elements on Surface Hardness of Ferritic Nitrocarburizing Layers of Barrels

2019 ◽  
Vol 95 (1) ◽  
pp. 419-426
Author(s):  
Zdenek Pokorny ◽  
David Dobrocký
Keyword(s):  
Surface Hardness ◽  
Alloying Elements ◽  
Ferritic Nitrocarburizing

The Influence of Alloying Elements on Surface Hardness of Ferritic Nitrocarburizing Layers of Ball Screws

2018 ◽  
Vol 87 (1) ◽  
pp. 443-449
Author(s):  
Zdenek Pokorny ◽  
David Dobrocký ◽  
Petr Faltejsek
Keyword(s):  
Surface Hardness ◽  
Alloying Elements ◽  
Ferritic Nitrocarburizing

Plasma Surface Alloying W-Mo Low-Alloy HSS

2005 ◽  
Vol 475-479 ◽  
pp. 3955-3958
Author(s):  
Jin Yong Xu ◽  
Yan Ping Liu ◽  
Yuan Gao ◽  
Zhong Xu
Keyword(s):  
High Speed ◽  
Surface Hardness ◽  
High Speed Steel ◽  
Alloying Elements ◽  
Work Piece ◽  
Test Results ◽  
Surface Alloying ◽  
Plasma Surface ◽  
The Common ◽  
Plasma Surface Alloying

The plasma surface alloying low-alloy high speed steel (HSS) is carried out in vacuum chamber where a source electrode (W-Mo) and a work piece are properly placed. By using the sputter of glow-discharge, under the common function of electric field and temperature field, ?????? the desired alloying elements (W- Mo) are sputtered from the source cathode, traveling toward the substrate. Subsequently the alloying elements deposit onto the surface of the substrate, forming alloy diffusion layer which the depth may vary from several micron to several hundreds micron. In the end a surface low-alloy HSS steel would be produced after ultra-saturation ion carbonization. The composition of the alloyed layer is equal or similar with it of low-alloy HSS. The carbonized layer, without coarse eutectic ledeburite structure, possesses high density of finely and dispersed alloy carbides with tungsten equivalent 10% above and a significant improvement in surface hardness and wear resistance. The principle of plasma surface alloying and its test results and commercial products application are introduced in this paper.

Research on Microstructures of Alloyed Layer by Plasma Surface Alloying with Tungsten and Molybdenum

2005 ◽  
Vol 297-300 ◽  
pp. 1108-1112
Author(s):  
Gao Yuan ◽  
Jin Yong Xu ◽  
Yan Ping Liu ◽  
Jian Zhong Wang ◽  
Xiaoyun Kui ◽  
...  
Keyword(s):  
High Temperature ◽  
Surface Composition ◽  
Surface Hardness ◽  
High Hardness ◽  
Carbon Steels ◽  
Alloying Elements ◽  
Low Carbon ◽  
Surface Alloying ◽  
Operating Life ◽  
Resistance To Wear

The alloying elements W-Mo cementation is carried out on the surfaces of low carbon steels by the technique of plasma metallurgy. Then by using the plasma-supersaturated carbonization, the composition of surface alloying layer reaches or approaches that of low-alloy HSS. In the end the surface alloying layer possesses high hardness, favorable red hardness and a significant improvement in properties after high temperature quenching and high temperature tempering. The surface cementation structure and phase structure of alloying layer were analyzed using metallographic microscope and X-ray diffraction (XRD), respectively; the distribution of surface composition and hardness of the layer were investigated by Glow Discharge Analytical Instrument (GDA) and micro hardness instrument, respectively; the resistance to wear was tested by a abrasion machine. The experimental results indicated that the layer consisted of W-Mo solid solution in Fe, the depth of the layer could reach 100µm and the content of tungsten exceeded 10% after ion W-Mo cementation. The carbon content of carburized layer was 1.3% above, which was composed of M6C carbide containing a lot of elements of W-Mo. The surface hardness of the alloying layer attained the HV1000 or so and appeared graded distribution after quenching and tempering. The application study showed that alloying elements W-Mo cementation was an appropriate technique to enhance surface resistance to wear and prolong operating life of accessories.

Study on the Dimensional Changes and Residual Stresses in Carbonitrided and Ferritic Nitrocarburized SAE 1010 Plain Carbon Steel

2010 ◽  
Vol 638-642 ◽  
pp. 829-834 ◽  
Author(s):  
Chun Yan Nan ◽  
Derek O. Northwood ◽  
Randy J. Bowers ◽  
Xi Chen Sun
Keyword(s):  
Heat Treatment ◽  
Carbon Steel ◽  
Residual Stresses ◽  
Surface Hardness ◽  
Surface Characteristics ◽  
Treatment Method ◽  
Plain Carbon Steel ◽  
Dimensional Changes ◽  
Modification Technique ◽  
Ferritic Nitrocarburizing

Carbonitriding is a metallurgical surface modification technique that is widely used in the automotive industry to increase surface hardness and wear resistance. Given the problems associated with carbonitriding, such as dimensional distortion, oxidation and non-uniform surface hardness, nitrocarburizing has been proposed as an alternative heat treatment method to improve the surface characteristics. The major advantages of ferritic nitrocarburizing are the minimal dimensional changes and distortion due to the low process temperature at which no phase transformations occur. This increases productivity and product quality, and decreases costs. The focus of this study was to determine the effects of carbonitriding and ferritic nitrocarburizing processes on the dimensional changes and residual stresses in a steel used for automotive applications. Navy C-ring specimens and prototype stamped parts made from SAE 1010 plain carbon steel were used in the testing. Gas, vacuum and ion ferritic nitrocarburizing processes with different heat treatment parameters were investigated. X-ray diffraction techniques were used for the residual stresses evaluation and surface phase analysis of the specimens.

Practical Nitriding and Ferritic Nitrocarburizing

2003 ◽  
Author(s):  
David Pye
Keyword(s):  
Control Process ◽  
Surface Hardness ◽  
Case Depth ◽  
Process Equipment ◽  
Specific Design ◽  
Iron And Steel ◽  
Before And After ◽  
Set Up ◽  
Ferritic Nitrocarburizing ◽  
And Control

Practical Nitriding and Ferritic Nitrocarburizing addresses many questions that arise when using nitriding and nitrocarburizing processes to case harden engineered components. It describes the basic chemistry of each process and its effect on the metallurgy and microstructure of different grades of iron and steel. It explains how the processes and their variants are implemented and how to set up, monitor, and control process equipment to meet specific design objectives. It discusses the factors that must be considered when selecting materials and determining parameters related to surface hardness, case depth, compound zone thickness, corrosion and wear resistance, distortion, and other such variables. It also explains how materials should be prepared and handled before and after processing, how to examine and evaluate results, and how to diagnose and fix problems. For information on the print version, ISBN 978-0-87170-791-8, follow this link.

Effect of silver nitrate on some mechanical properties of heat polymerizing acrylic resins

2019 ◽  
Vol 14 (1) ◽  
pp. 110
Author(s):  
Assiss. Prof. Dr. Sabiha Mahdi Mahdi ◽  
Dr. Firas Abd K. Abd K.
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Silver Nitrate ◽  
Surface Hardness ◽  
Mechanical Tests ◽  
Hardness Tester ◽  
Acrylic Resins ◽  
The Difference

Aim: The aimed study was to evaluate the influence of silver nitrate on surfacehardness and tensile strength of acrylic resins.Materials and methods: A total of 60 specimens were made from heat polymerizingresins. Two mechanical tests were utilized (surface hardness and tensile strength)and 4 experimental groups according to the concentration of silver nitrate used.The specimens without the use of silver nitrate were considered as control. Fortensile strength, all specimens were subjected to force till fracture. For surfacehardness, the specimens were tested via a durometer hardness tester. Allspecimens data were analyzed via ANOVA and Tukey tests.Results: The addition of silver nitrate to acrylic resins reduced significantly thetensile strength. Statistically, highly significant differences were found among allgroups (P≤0.001). Also, the difference between control and experimental groupswas highly significant (P≤0.001). For surface hardness, the silver nitrate improvedthe surface hardness of acrylics. Highly significant differences were statisticallyobserved between control and 900 ppm group (P≤0.001); and among all groups(P≤0.001)with exception that no significant differences between control and150ppm; and between 150ppm and 900ppm groups(P>0.05).Conclusion: The addition of silver nitrate to acrylics reduced significantly the tensilestrength and improved slightly the surface hardness.

Effect of light intensity and water aging on surface hardness of dental resin-composites

2019 ◽  
Vol 64 (11) ◽  
pp. 1007-1014
Author(s):  
Tong XU ◽  
◽  
Jia-Hui ZHANG ◽  
Zhao-Ying LIU ◽  
Xuan LI ◽  
...  
Keyword(s):  
Light Intensity ◽  
Surface Hardness ◽  
Resin Composites ◽  
Dental Resin ◽  
Dental Resin Composites ◽  
Effect Of Light

Severe plastic deformation of Al-1%Cu Alloy processed by a Simple Cyclic Extrusion Compression technique

2018 ◽  
Vol 1 (1) ◽  
pp. 77-90
Author(s):  
Walaa Abdelaziem ◽  
Atef Hamada ◽  
Mohsen A. Hassan
Keyword(s):  
Mechanical Properties ◽  
Plastic Deformation ◽  
Severe Plastic Deformation ◽  
Deformation Behavior ◽  
Cast Alloy ◽  
Surface Hardness ◽  
Grain Structure ◽  
Compression Technique ◽  
Cu Alloy ◽  
Cyclic Extrusion Compression

Severe plastic deformation is an effective method for improving the mechanical properties of metallic alloys through promoting the grain structure. In the present work, simple cyclic extrusion compression technique (SCEC) has been developed for producing a fine structure of cast Al-1 wt. % Cu alloy and consequently enhancing the mechanical properties of the studied alloy. It was found that the grain structure was significantly reduced from 1500 µm to 100 µm after two passes of cyclic extrusion. The ultimate tensile strength and elongation to failure of the as-cast alloy were 110 MPa and 12 %, respectively. However, the corresponding mechanical properties of the two pass CEC deformed alloy are 275 MPa and 35%, respectively. These findings ensure that a significant improvement in the grain structure has been achieved. Also, cyclic extrusion deformation increased the surface hardness of the alloy by 49 % after two passes. FE-simulation model was adopted to simulate the deformation behavior of the material during the cyclic extrusion process using DEFORMTM-3D Ver11.0. The FE-results revealed that SCEC technique was able to impose severe plastic strains with the number of passes. The model was able to predict the damage, punch load, back pressure, and deformation behavior.

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