Effect of Surface Preparation by Non-Directional Grinding on Properties of AISI D2 Plasma-Nitride Layer

2013 ◽  
Vol 376 ◽  
pp. 190-194
Author(s):  
S. Rajsiri ◽  
T. Kraiha ◽  
L. Plangklang ◽  
U. Chairue
Keyword(s):  
Plasma Nitriding ◽  
Diamond Particle ◽  
Surface Preparation ◽  
Nitride Layer ◽  
Surface Finishing ◽  
Hardness Profile ◽  
Nitride Coating ◽  
Tool Steels ◽  
Finishing Process ◽  
Aisi D2

This research studies the properties of plasma-nitride coating on AISI D2 tool steels prepared by non-directional grinding at various finishing. In the manufacturing process, the AISI D2 was machined to size and hardened with a typical hardening process. In addition, its surface was treated with plasma nitriding. Various levels of roughness were produced as well as possible affects on the nitride coating properties. In this study, the following five conditions of grinding were performed on the hardened specimens: 1-µm diamond particle and four SiC grinding papers: P100, P240, P800, and P2500. The surface finishing with at least 0.023-µm roughness value (P800 grinding) provided a plasma-nitride layer with a moderately good hardness profile and a thick nitride layer compared with other finer finishing. This finishing process was also more economical requiring less time and manpower to create than others. Overall, this study suggests that finer surface finishing has a tendency to significantly improve the tool steels hardness profile and hardened depth.

scholarly journals Machining the Surface of Orthopedic Stent Wire Using a Non-Toxic Abrasive Compound in a Magnetic Abrasive Finishing Process

2021 ◽  
Vol 11 (16) ◽  
pp. 7267
Author(s):  
Jeong Su Kim ◽  
Lida Heng ◽  
Sieb Chanchamnan ◽  
Sang Don Mun
Keyword(s):  
Surface Roughness ◽  
Diamond Particle ◽  
Processing Parameters ◽  
Surface Finishing ◽  
Toxic Substances ◽  
Magnetic Abrasive Finishing ◽  
Grapeseed Oil ◽  
Cold Cream ◽  
Finishing Process ◽  
Abrasive Finishing

The orthopedic stent wire is one of the critical medical components, which is mainly used for the replacement of physically damaged parts in the human body. Therefore, a smooth surface and lack of toxic substances on the surface of this component are highly demanded. In this study, a magnetic abrasive finishing (MAF) process was carried out using a non-toxic abrasive compound (a mixture of iron powder, diamond particles, cold cream, and eco-friendly oils) to achieve high-quality surface finishing of orthopedic stent wire. The surface roughness (Ra) of the stent wire was investigated according to various processing parameters: different rotational speeds (500, 1000, and 2000 rpm), diamond particle sizes (1.0 µm), and three eco-friendly oils (olive oil: C98H184O10; grapeseed oil: C18H32O2; and castor oil: C57H104O9) within 300 s of the finishing time. The results showed that the surface roughness of the wire was reduced to 0.04 µm with a rotation speed of 1000 rpm and a diamond particle size of 1 µm when using grapeseed oil. SEM microimages and EDS analysis showed that the MAF process using a non-toxic abrasive compound could improve the surface quality of orthopedic Ni-Ti stent wire with a lack of toxic substances on the surface finish.

Plasma nitriding of AISI 431 steel: surface hardness - hardness profile [Nitruración por plasma del acero AISI 431: dureza superficial – perfil de durezas]

2020 ◽  
Vol 4 (2) ◽  
pp. 22
Author(s):  
Aldo Castillo ◽  
Cesar Molina ◽  
Edinson Reyes ◽  
Hans Portilla ◽  
César Arévalo ◽  
...  
Keyword(s):  
Plasma Nitriding ◽  
Surface Hardness ◽  
Pairwise Comparison ◽  
Nitride Layer ◽  
Hardness Profile ◽  
Nitriding Time ◽  
Microscopic Evaluation ◽  
Significant Difference ◽  
Student’S T ◽  
Effective Layer

The present research evaluated the effect of the nitriding time in plasma in the range of 5 to 15 hours, on the hardness profile of the cross section of stainless steel samples AISI 431; in addition to taking and differentiating the data on surface hardness, effective layer depth and nitride layer thickness. The nitriding process was by plasma, the process temperature was kept constant at 400 °C. The evaluated samples were machined (rolled and countersigned), and were left in one inch diameter and one inch in length. The times of 10 and 15 hours of nitriding time were obtained by accumulating time of 05 hours of nitriding per week; the hardness profiles were obtained by using the LECO model LMV-50V micro durometer; The ASTM E3-91 standard was used to collect the aforementioned hardness data, from these it was possible to determine that the maximum surface hardnesses are (1053, 1252 and 1327) HV-0.01, for nitriding times of (5,10 and 15) hours respectively, the average effective layer thicknesses were (37.75, 33 and 28.75) μm; while the nitride layer thicknesses were (4.9, 7.03 and 10.7) μm corresponding to times of (5, 10 and 15) hours respectively. The hardness in the core after the nitriding treatment was kept in the range of (275-277) HV-0.01. These values were determined by microscopic evaluation of the tested samples, the metallography reagent used was 3% Nital by electrolytic attack for 3 minutes in each case. The statistical analysis corresponded to Student's “t” tests, in the form of pairwise comparison, from which the non-significant difference between repetitions and the significant difference between the different levels of study were determined.

scholarly journals Gold, Silver, and Electrum Electroless Plating on Additively Manufactured Laser Powder-Bed Fusion AlSi10Mg Parts: A Review

Coatings ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 422
Author(s):  
Dana Ashkenazi ◽  
Alexandra Inberg ◽  
Yosi Shacham-Diamand ◽  
Adin Stern
Keyword(s):  
Additive Manufacturing ◽  
Low Cost ◽  
Ion Beam ◽  
Surface Finishing ◽  
Powder Bed Fusion ◽  
Laser Powder Bed Fusion ◽  
Powder Bed ◽  
Finishing Process ◽  
Gold Silver ◽  
3D Printed

Additive manufacturing (AM) revolutionary technologies open new opportunities and challenges. They allow low-cost manufacturing of parts with complex geometries and short time-to-market of products that can be exclusively customized. Additive manufactured parts often need post-printing surface modification. This study aims to review novel environmental-friendly surface finishing process of 3D-printed AlSi10Mg parts by electroless deposition of gold, silver, and gold–silver alloy (e.g., electrum) and to propose a full process methodology suitable for effective metallization. This deposition technique is simple and low cost method, allowing the metallization of both conductive and insulating materials. The AlSi10Mg parts were produced by the additive manufacturing laser powder bed fusion (AM-LPBF) process. Gold, silver, and their alloys were chosen as coatings due to their esthetic appearance, good corrosion resistance, and excellent electrical and thermal conductivity. The metals were deposited on 3D-printed disk-shaped specimens at 80 and 90 °C using a dedicated surface activation method where special functionalization of the printed AlSi10Mg was performed to assure a uniform catalytic surface yielding a good adhesion of the deposited metal to the substrate. Various methods were used to examine the coating quality, including light microscopy, optical profilometry, XRD, X-ray fluorescence, SEM–energy-dispersive spectroscopy (EDS), focused ion beam (FIB)-SEM, and XPS analyses. The results indicate that the developed coatings yield satisfactory quality, and the suggested surface finishing process can be used for many AM products and applications.

Internal Plasma Spray Process for Cylinder Bores in Automotive Industry

1997 ◽  
Author(s):  
G. Barbezat ◽  
S. Keller ◽  
G. Wuest
Keyword(s):  
Plasma Spray ◽  
Automotive Industry ◽  
Surface Preparation ◽  
Cost Effective ◽  
Cylinder Block ◽  
Future Application ◽  
Surface Finishing ◽  
Major Advance ◽  
Plasma Gun ◽  
Spray Process

Abstract In the Automotive Industry the need for lower manufacturing costs, the use of less strategic material, and easier, faster, and more flexible routes for manufacturing are being looked for continuously. The environmental concerns relating to the use of galvanic coatings is growing. This has led to the examination of the plasma-powder spray process for the application of coatings for surface modification. In the area of engine cylinder bore coatings a major advance is taking place in the use of a rotating plasma spray device. This paper covers the use of a plasma-powder spray process for the coating of aluminum-silicon cylinder block bores using a rotating plasma gun capable of producing coatings of reliable microstructure and integrity. Properties and microstructures of the applied coatings will be presented. Test results will be shown that the necessary bond strength of the coating can be achieved without the use of a bond coat. Surface preparation prior to coating and surface finishing methods after coating will also be discussed. Experience in Europe, Japan and the Unites States will be discussed which show that the plasma-powder spray process offers a performance proven and cost effective solution for the coating of cylinder bores, thus demonstrating the future application potential for this technology.

scholarly journals Investigation into Hand Scraping: A Microanalysis

2018 ◽  
Vol 2 (4) ◽  
pp. 76 ◽  
Author(s):  
Kai Oßwald ◽  
Ingo Lochmahr ◽  
Yasin Bagci ◽  
Peter Saile
Keyword(s):  
Inertial Measurement Unit ◽  
Three Dimensional ◽  
Movement Pattern ◽  
Measurement Unit ◽  
Surface Finishing ◽  
Future Research ◽  
Tool Orientation ◽  
Inertial Measurement ◽  
Finishing Process ◽  
Basic Characteristics

Hand scraping is a manual surface finishing process that, despite its low productivity and high cost, is still applied in many industries because of its advantages concerning accuracy and tribology. In the presented microanalysis forces, movement patterns and tool orientation of individual hand scraping strokes were measured using a test stand, specifically designed for this purpose. It utilizes a camera, a three dimensional dynamometer, and an inertial measurement unit (IMU). The results show the basic characteristics of hand scraping. Typical courses of relevant quantities like cutting force, passive force, clearance, and directional angle are shown. In addition, the movement pattern of the tool during individual scraping strokes is analyzed. This research aims to contribute to a later implementation of automated scraping. The conducted research creates a base for future research regarding different scraping methods and achieved results.

scholarly journals Effects of Nitrogen Gas Ratio on Nitride Layer and Microhardness of Tool Steel(SKH51) in Plasma Nitriding

2002 ◽  
Vol 12 (6) ◽  
pp. 447-451
Author(s):  
Deok-Jae Kim ◽  
Hae-Ryong Lee ◽  
Jong-Gu Gwak ◽  
U-Chang Jeong ◽  
Yeong-Rae Jo
Keyword(s):  
Tool Steel ◽  
Plasma Nitriding ◽  
Nitride Layer ◽  
Nitrogen Gas ◽  
Gas Ratio

scholarly journals Multi-pass friction stirred clad welding of dissimilar joined AA6061 aluminium alloy and brass

2018 ◽  
Vol 12 (4) ◽  
pp. 4285-4299
Author(s):  
Nora Osman ◽  
Zainuddin Sajuri ◽  
Mohd Zaidi Omar
Keyword(s):  
Mechanical Properties ◽  
Tool Steel ◽  
Microstructural Analysis ◽  
Welding Process ◽  
Fusion Welding ◽  
Tool Steels ◽  
Aa6061 Aluminium Alloy ◽  
Aisi D2 ◽  
Semi Solid ◽  
Aisi D2 Tool Steel

Tool steels are commonly used to cut metal materials due to their distinctive hardness, resistance to abrasion and deformation. However, tool steels are difficult to be joined using conventional fusion welding process. In this study, a thixotropic property of metal was utilised to butt-join an AISI D2 tool steel by using uncommon direct partial re-melting (DPRM) method. A high frequency of induction heating is used to apply the DPRM method. From the recent study, there are many methods in achieving the globular microstructure with the success of semi-solid joining process. Though, very less information on the microstructural effect of semi-solid joining on the mechanical properties was reported. This study aims to analyse the effect of uniaxial force on the microstructural evolution and mechanical properties of the thixo-joint of D2 tool steel. The microstructural analysis showed the diffusion occurred between the grains of the thixo-joint sample with 2.5 N uniaxial force. The maximum strength of the thixo-joint sample with force was 652 MPa. This was slightly higher than the as-received sample and the thixo-joint sample without force. The average hardness value of the thixo-joint sample was 400 HV due to the transformation of ferrite to the metastable austenite.

Sign in / Sign up

Export Citation Format

Share Document