Microstructures and properties of tungsten carbide particle-reinforced high-speed composites fabricated by spray forming

1999 ◽  
Vol 104 (1) ◽  
pp. 100-104 ◽  
Author(s):  
Yuan Wei ◽  
Daobin Mu ◽  
Liying Zhang ◽  
Chengyi Wu
Keyword(s):  
Tungsten Carbide ◽  
High Speed ◽  
Carbide Particle ◽  
Spray Forming

NIROSTA 4305

Alloy Digest ◽  
2002 ◽  
Vol 51 (5) ◽  
Keyword(s):  
Corrosion Resistance ◽  
Physical Properties ◽  
Tungsten Carbide ◽  
Tensile Properties ◽  
High Speed ◽  
High Speed Steel ◽  
Heat Treating ◽  
Austenitic Steels ◽  
High Sulfur Content ◽  
Machined Parts

Abstract NIROSTA 4305 is an austenitic alloy with a high sulfur content. The alloy is typically used for machined parts. As with other austenitic steels, it is necessary to machine with good-quality high-speed steel or tungsten carbide tools. This datasheet provides information on composition, physical properties, elasticity, and tensile properties. It also includes information on corrosion resistance as well as forming, heat treating, machining, and joining. Filing Code: SS-854. Producer or source: ThyssenKrupp Nirosta GmbH.

Composite cladded powders for spraying of protective coatings

2019 ◽  
pp. 59-64
Author(s):  
E. Yu. Gerashchenkova ◽  
T. I. Bobkova ◽  
E. A. Samodelkin ◽  
B. V. Farmakovsky
Keyword(s):  
Tungsten Carbide ◽  
Gas Phase ◽  
High Speed ◽  
Protective Coatings ◽  
Powder Materials ◽  
Nanosized Particles

The paper presents results of the development of technology for producing cladded and surfacealloyed powder materials. High-speed mechanosynthesis of matrix powders of FeCrAl and solid nanosized particles of tungsten carbide occurs in a disintegrator in the presence of an active gas phase (nitrogen).

Study on CPM9V High Speed Steel Ring Prepared by Spray Forming

2011 ◽  
Vol 311-313 ◽  
pp. 624-630
Author(s):  
Yi Xu ◽  
Chang Chun Ge
Keyword(s):  
High Speed ◽  
Technological Parameter ◽  
Preparation Method ◽  
High Speed Steel ◽  
Alloy Element ◽  
Spray Forming ◽  
Regular Shape ◽  
Carbide Morphology ◽  
Carbide Particles ◽  
Deposition Substrate

CPM9V high speed steel(HSS) ring billet was prepared by spray forming(SF), the yield is 83.5%, porosity is 0.8%, spray forming preparation method and technological parameter were illustrated. The microstructure and carbide morphology on the different position of billet were observed. The results show that carbide particles have small size, regular shape and uniform distribution, alloy element without segregation. There are some pores and defects in the position of ring billet closed to deposition substrate, come from spray forming instability beginning stage.

Microstructures and Properties of Tungsten Carbide Particle-Reinforced Composites Fabricated by Overlaying Welding with Flux-Cored Wire

2011 ◽  
Vol 228-229 ◽  
pp. 548-551
Author(s):  
Lian Jie Li ◽  
Le Dai
Keyword(s):  
Wear Resistance ◽  
Tungsten Carbide ◽  
Carbide Particle ◽  
Reinforced Composites ◽  
Small Particles ◽  
Cored Wire ◽  
Steel Microstructure ◽  
Surface Iron ◽  
The Matrix ◽  
Surface Rigidity

The wire was made by Tungsten Carbide(WC) particles as core. MIG welding was used to surface iron-based WC wearable composite coating of different size and content of WC particles on mild steel. Microstructure was investigated. Surface rigidity and wear resistance were tested. The results indicate that the small particles are dissolved seriously, which separate out with reticulation. The hardness and wear resistance of the matrix are relative higher. The big particles are dissolved less, tree crystal separates out along particles. The particles are easy to fall off when wearing. So the hardness and wear resistance of the substrate are relative lower. The admixture with 80% big particles and 20% small particles has the best wear resistance, its wear resistance can achieve quintupling of quenching 45 steel. The hardness and wear resistance increase with content of WC increasing.

Influence of Powder Structure on Decarburization and Microstructure of HVOF Sprayed WC-12wt.%Co Coatings

2013 ◽  
Vol 834-836 ◽  
pp. 609-612 ◽  
Author(s):  
Ning Ma ◽  
Zhen Xiong Cheng ◽  
Huan Tao Wu ◽  
Fu Xing Ye
Keyword(s):  
Particle Size ◽  
Tungsten Carbide ◽  
Carbide Particle ◽  
Volume Fraction ◽  
Xrd Analysis ◽  
X Ray Diffraction ◽  
Spray System ◽  
Hvof Spray ◽  
Steel Substrates ◽  
Sprayed Coatings

In order to examine the influences of tungsten carbide particle size on decarburization behavior and microstructure of HVOF sprayed WC-Co coating, four kinds of agglomerated WC-12wt.%Co powders were deposited on mild steel substrates by using a high velocity oxy-fuel (HVOF) spray system. The phase compositions and microstructure of the feedstock powders and sprayed coatings were investigated by X-ray diffraction (XRD) analysis and scanning electron microscopy (SEM), respectively. The results showed that the decarburization became more serious with the decreasing of tungsten carbide particle size in the starting powder. W phase was detected in the as-sprayed nanocomposite WC-12wt.%Co coating. All the coatings showed very compact microstructure with the hard phases embedded in Co matrix. The microstructure of HVOF sprayed WC-12wt.%Co coatings depended on the feedstock powder structure. The shape of tungsten carbide particles was rounder and the volume fraction of carbide phase decreased in coatings as the tungsten carbide particle size decreased.

Spray forming high speed steel—properties and processing

2004 ◽  
Vol 383 (1) ◽  
pp. 87-95 ◽  
Author(s):  
Rafael Agnelli Mesquita ◽  
Celso Antonio Barbosa
Keyword(s):  
High Speed ◽  
High Speed Steel ◽  
Spray Forming ◽  
Steel Properties

scholarly journals Enamel Quality after Debonding: Evaluation by Optical Coherence Tomography

2015 ◽  
Vol 26 (4) ◽  
pp. 384-389 ◽  
Author(s):  
Jorge César Borges Leão Filho ◽  
Ana Karla Souza Braz ◽  
Renato Evangelista de Araujo ◽  
Orlando Motohiro Tanaka ◽  
Matheus Melo Pithon
Keyword(s):  
Optical Coherence Tomography ◽  
Tungsten Carbide ◽  
High Speed ◽  
Adhesive Layer ◽  
Optical Coherence ◽  
Low Speed ◽  
Ceramic Brackets

<p>The aims of this study were to evaluate quantitatively the enamel fractures, adhesive remnants and bracket fragments on enamel after debonding of metal and ceramic brackets, and to quantify the layer of adhesive remnants in depth after two different cleanup procedures. Metal and ceramic brackets were bonded on 120 human incisors and then debonded using two different techniques with Side Cutter (SC) and Anterior Bracket Removal plier (ABR). After this, a high-speed tungsten carbide finishing bur or a low-speed tungsten carbide finishing bur was used. The debonded samples were submitted to enamel assessment with optical coherence tomography (OCT). In sequence, two different methods of removing the remaining adhesive (tungsten carbide burs at high and low speed) were performed and at the end of these procedures, the remaining adhesive layer was measured with OCT. The results demonstrated that enamel fractures were observed only in the samples bonded with ceramic brackets, and the type of pliers did not influence the incidence and extent of enamel damage. Moreover, the type of debonding technique (with side-cutting pliers or anterior bracket removal pliers) and the type of bracket did not influence the amount of adhesive remaining after debonding. The burs at low speed removed the remaining adhesive more effectively during cleanup procedures.</p>

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