Efficient Process to Develop Self-Sharpening Active Elements

2020 ◽  
Vol 1157 ◽  
pp. 188-193
Author(s):  
Victor Geantă ◽  
Ionelia Voiculescu ◽  
Emilia Binchiciu ◽  
Daniela Maria Iovanaș ◽  
Radu Ştefănoiu ◽  
...  
Keyword(s):  
Steel Substrate ◽  
High Hardness ◽  
Maximum Lifespan ◽  
Good Resistance ◽  
Metal Elements ◽  
Efficient Process ◽  
Active Elements ◽  
In Series ◽  
Resistance To Wear ◽  
Low Alloyed Steel

The paper presents technologies for the manufacturing of modulated bi-metal elements, used as interchangeable reinforcement, according to patent RO129865. The bi-metal was developed by surface build-up of functional layers that have increased hardness, on a low alloyed steel substrate, so as to ensure maximum lifespan in exploitation. Welded layers deposited on active areas has a thickness of 3 mm and have high hardness (about 50-60 HRC) in order to ensure a good resistance to wear by abrasion, possibly combined with fatigue, erosion or corrosion. The modulated elements sizes are equal to or higher than the wear additions, up to 10%, being dimensioned on the principles of preventive-repetitive maintenance. The interchangeable bi-metal elements are welded on the steel components of machines, used for hot or cold processing of parts and semi-finished products manufactured in series.

AFCOMET 40

Alloy Digest ◽  
1953 ◽  
Vol 2 (9) ◽  
Keyword(s):  
Fracture Toughness ◽  
Shear Strength ◽  
Cast Iron ◽  
Physical Properties ◽  
Tensile Properties ◽  
Heat Treating ◽  
Good Resistance ◽  
Resistance To Wear

Abstract AFCOMET 40 is a dense, close-grained nickel-molybdenum cast iron with good resistance to wear and abrasion. This datasheet provides information on composition, physical properties, hardness, elasticity, tensile properties, and compressive and shear strength as well as fracture toughness and fatigue. It also includes information on casting, heat treating, machining, and joining. Filing Code: CI-2. Producer or source: Atlas Foundry Company.

AMPCO 483

Alloy Digest ◽  
1978 ◽  
Vol 27 (4) ◽  
Keyword(s):  
Corrosion Resistance ◽  
Physical Properties ◽  
Tensile Properties ◽  
Base Alloy ◽  
High Hardness ◽  
High Strength ◽  
Heat Treating ◽  
Good Resistance ◽  
Copper Base ◽  
Copper Base Alloy

Abstract AMPCO 483 is a copper-base alloy that can be used in the cast or wrought form. It provides high strength, high hardness, excellent resistance to corrosion and good resistance to fatigue and wear. It is well suited for service at temperatures up to 750 F and for applications such as pickling equipment, nuts and marine hardware. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties. It also includes information on corrosion resistance as well as casting, forming, heat treating, machining, and joining. Filing Code: Cu-352. Producer or source: Ampco Metal Inc..

BERYLCO 25S

Alloy Digest ◽  
1952 ◽  
Vol 1 (3) ◽  
Keyword(s):  
Mechanical Properties ◽  
High Performance ◽  
Precipitation Hardening ◽  
Elevated Temperatures ◽  
Heat Treating ◽  
Good Resistance ◽  
Subzero Temperatures ◽  
Endurance Strength ◽  
Wear And Corrosion ◽  
Resistance To Wear

Abstract Berylco 25S alloy is the high-performance beryllium-copper spring material of 2 percent nominal beryllium content. It responds to precipitation-hardening for maximum mechanical properties. It has high elastic and endurance strength, good electrical and thermal conductivity, excellent resistance to wear and corrosion, high corrosion-fatigue strength, good resistance to moderately elevated temperatures, and no embrittlement or loss of normal ductility at subzero temperatures. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties. It also includes information on corrosion resistance as well as forming, heat treating, machining, and joining. Filing Code: Cu-3. Producer or source: Beryllium Corporation.

AL TECH MIAMI

Alloy Digest ◽  
1983 ◽  
Vol 32 (11) ◽  
Keyword(s):  
Stainless Steel ◽  
Corrosion Resistance ◽  
Heat Treating ◽  
Good Resistance ◽  
Aisi Type ◽  
Steel Aisi ◽  
Resistance To Wear ◽  
Specialty Steel ◽  
Stainless Steel Aisi ◽  
Plastic Mold

Abstract AL TECH MIAMI is both a hardenable stainless steel (AISI Type 420) and a tool steel for making molds for plastic. A major requirement for plastic mold steel is corrosion resistance. Certain plastics, such as poly-vinyl chlorides, are very corrosive and stored molds often rust from sweating water lines and/or humid environments. AL TECH MIAMI has good resistance to wear. It is melted and AOD refined to assure the mold-maker of cleanliness and freedom from internal imperfections. It provides exceptionally good polishability for lens-quality molds. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties. It also includes information on corrosion resistance as well as forming, heat treating, and machining. Filing Code: SS-435. Producer or source: AL Tech Specialty Steel Corporation.

scholarly journals Investigation of Multiparameter Laser Stripping of AlTiN and DLC C Coatings

Materials ◽  
2021 ◽  
Vol 14 (4) ◽  
pp. 951
Author(s):  
Tomáš Primus ◽  
Josef Hlavinka ◽  
Pavel Zeman ◽  
Jan Brajer ◽  
Martin Šorm ◽  
...  
Keyword(s):  
Surface Roughness ◽  
High Efficiency ◽  
Steel Substrate ◽  
Cutting Tools ◽  
High Hardness ◽  
Working Time ◽  
Nanosecond Laser ◽  
Altin Coating ◽  
Successful Removal ◽  
Frequency Laser

The lifetime and properties of cutting tools and forming moulds can be prolonged and enhanced by the deposition of hard, thin coatings. After a certain period of usage, the coating will deteriorate. Any remaining coating must be removed prior to successful recoating. Laser stripping is a fast and environmentally friendly coating removal method. In this paper, we present laser removal of two types of coatings deposited on a 1.2379 tool steel substrate, namely, an AlTiN coating with high hardness and a DLC C coating with a small coefficient of friction (COF). A powerful nanosecond laser was employed to remove the coating from the substrate with high efficiency, along with suitable residual surface roughness. Measurements were taken of surface roughness, removed depth, and working time on a stripped area of 1 cm2. The samples were evaluated under a microscope, with a 3D profilometer, and by EDS chemical analysis. Successful removal of the coating was confirmed by optical analysis, but detailed chemical characterisation showed that about 30% of the coating element may remain on the surface. Moreover, a working time of less than 7.5 s per cm2 was obtained in this study. In addition, it was shown that the application of a second low energy, high frequency laser beam pass leads to remelting of the peaks of the material and reduced surface roughness.

scholarly journals Optimization of Ni-Based WC/Co/Cr Composite Coatings Produced by Multilayer Laser Cladding

2013 ◽  
Vol 2013 ◽  
pp. 1-7 ◽  
Author(s):  
Andrea Angelastro ◽  
Sabina L. Campanelli ◽  
Giuseppe Casalino ◽  
Antonio D. Ludovico
Keyword(s):  
Laser Cladding ◽  
Steel Substrate ◽  
Composite Coatings ◽  
Metallic Matrix ◽  
Optimization Procedure ◽  
High Hardness ◽  
Fatigue Properties ◽  
Metal Composite ◽  
Tungsten Carbides ◽  
Cobalt Chromium

As a surface coating technique, laser cladding (LC) has been developed for improving wear, corrosion, and fatigue properties of mechanical components. The main advantage of this process is the capability of introducing hard particles such as SiC, TiC, and WC as reinforcements in the metallic matrix such as Ni-based alloy, Co-based alloy, and Fe-based alloy to form ceramic-metal composite coatings, which have very high hardness and good wear resistance. In this paper, Ni-based alloy (Colmonoy 227-F) and Tungsten Carbides/Cobalt/Chromium (WC/Co/Cr) composite coatings were fabricated by the multilayer laser cladding technique (MLC). An optimization procedure was implemented to obtain the combination of process parameters that minimizes the porosity and produces good adhesion to a stainless steel substrate. The optimization procedure was worked out with a mathematical model that was supported by an experimental analysis, which studied the shape of the clad track generated by melting coaxially fed powders with a laser. Microstructural and microhardness analysis completed the set of test performed on the coatings.

Coating of Austentic Stainless Steel with Ti/O Compositionally Gradient Film by Reactive DC Sputtering

2006 ◽  
Vol 45 ◽  
pp. 1218-1223
Author(s):  
Tsutomu Sonoda ◽  
Akira Watazu ◽  
Kiyotaka Katou ◽  
Tadashi Asahina
Keyword(s):  
Stainless Steel ◽  
Titanium Oxide ◽  
Oxygen Content ◽  
Abrasion Resistance ◽  
Steel Substrate ◽  
High Hardness ◽  
Oxide Coating ◽  
Mixing Condition ◽  
Compositional Gradient ◽  
Dc Sputtering

Coating of austentic stainless steel substrates with Ti/O compositionally gradient film was examined using reactive DC sputtering technique, in order to improve not only the abrasion resistance of the stainless steel but also the adhesion between the deposited film and the substrate with preserving the high hardness of such a hard ceramic coating as titanium oxide coating. The deposition of Ti/O compositional gradient films were realized by varying continuously the oxygen content in Ar-O2 sputter-gas during the reactive sputtering. The obtained films were appeared to be uniform and adhesive, while Ti-O compositional constant (i.e. non-gradient) films which were deposited by reactive DC sputtering under the same sputtering conditions except for the Ar-O2 gas mixing condition, i.e., with the oxygen content in the gas mixture constant, peeled off partly. According to AES in-depth profiles, the oxygen (O) concentration in the obtained film gradually decreased in depth direction from the surface toward the substrate, confirming that Ti/O compositional films had formed on the stainless steel. On the basis of XRD, it was found that not only hcp alpha-titanium and titanium oxide (anatase) but also some types of suboxides had formed in the gradient films. Furthermore the gradient films approximately indicated Hv600 which was much higher than that of the stainless steel substrate. Therefore the abrasion resistance of the stainless steel and the adhesion at the interface were expected to be improved at the same time.

Equal Resistant to Wear Blades Used in Rough Exploitation Conditions

2018 ◽  
Vol 1146 ◽  
pp. 22-26
Author(s):  
Daniel Tihanov Tanasache ◽  
Daniela Dinica ◽  
Emilia Florina Binchiciu ◽  
Horia Binchiciu
Keyword(s):  
Working Conditions ◽  
Mechanical Fatigue ◽  
Base Materials ◽  
Wear Protection ◽  
Welded Structure ◽  
Protection Systems ◽  
Resistance To Wear ◽  
Low Alloyed Steel ◽  
Welding Procedure ◽  
Self Protection

The paper presents representative aspects of the blades and the characterisation of excavator blades, namely frontal loader in the quall resistance to wear version. In exploitation the active surfaces of the blades are subjected to wear through abrasion under high and medium pressure, combined with mechanical fatigue with variable cycles. Retiring the blades is determined by significant degradation of the side zones. The solution developed in order to confront the mentioned phenomena is of modular type, namely equipping the blades with intelligent protection and self-protection systems to wear, which are deposited by cladding with welding on the supports. The blades support is made out of low alloyed steel, which have a controlled hardness and are micro alloyed with boron. The rods used to develop the wear protection systems are type Fe-25%Cr-4%W-Ti-V-La which deposit layers that have a minimum hardness of 55HRC. The challenges solved are related to welding compatibility, in working conditions, of the base materials and the welding ones, through manual electric welding procedure and respective deformation due to residual tensions in the welded structure.

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.

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