Decomposition of Two Phase WC and W2C in Casting Tungsten Carbide Particles in Steel/Iron Substrate Composites

2011 ◽  
Vol 109 ◽  
pp. 120-124 ◽  
Author(s):  
Quan Shan ◽  
Zu Lai Li ◽  
Ye Hua Jiang ◽  
Rong Zhou ◽  
Yu Dong Sui
Keyword(s):  
Physical Properties ◽  
Tungsten Carbide ◽  
Significant Role ◽  
Carbide Particle ◽  
Decomposition Process ◽  
Experimental Result ◽  
Two Phase ◽  
Heat Gain ◽  
Two Phases ◽  
Carbide Particles

The interface between matrix and casting tungsten carbide particle is produced by the the particles’ decomposition. Casting tungsten carbide particle is a kind of eutectic product，which is composed of two phases: WC and W2C. The two phases have differing chemical and physical properties, and thus follow different paths to achieve their decomposition process. By observing the decomposition of the particle, a hypothesis was put forward about how the casting tungsten carbide particle decomposes in steel/iron composites. An experiment was then designed to prove this hypothesis. The experimental result shows that heat gain plays a significant role in the decomposition process of casting tungsten carbide particles.

COLMONOY No. 75

Alloy Digest ◽  
1996 ◽  
Vol 45 (2) ◽  
Keyword(s):  
Physical Properties ◽  
Tungsten Carbide ◽  
Base Alloy ◽  
Nickel Base Alloy ◽  
Powder Metal ◽  
Nickel Base ◽  
Carbide Particles

Abstract Colmonoy No.75 is a hard surfacing alloy with tungsten carbide particles dispersed in a matrix of a nickel-base alloy containing chromium borides. It is supplied as a powder for application with Wall Colmonoy’s SPRAYWELD. This datasheet provides information on composition, physical properties, microstructure, and hardness. It also includes information on machining and powder metal forms. Filing Code: Ni-500. Producer or source: Wall Colmonoy Corporation.

COLMONOY 750

Alloy Digest ◽  
1998 ◽  
Vol 47 (10) ◽  
Keyword(s):  
Physical Properties ◽  
Tungsten Carbide ◽  
Matrix Alloy ◽  
Powder Metal ◽  
Carbide Particles

Abstract Colmonoy 750 is a tough Ni-Cr-W matrix alloy used to hold extremely hard tungsten-carbide particles. It is best used for the most severe abrasive conditions and is finished by grinding. This datasheet provides information on composition, physical properties, microstructure, hardness, and elasticity. It also includes information on machining, joining, and powder metal forms. Filing Code: Ni-546. Producer or source: Wall Colmonoy Corporation.

Flow Pattern Transition During Gas Liquid Upflow Through Vertical Concentric Annuli—Part II: Mechanistic Models

1999 ◽  
Vol 121 (4) ◽  
pp. 902-907 ◽  
Author(s):  
G. Das ◽  
P. K. Das ◽  
N. K. Purohit ◽  
A. K. Mitra
Keyword(s):  
Experimental Data ◽  
Physical Properties ◽  
Liquid Films ◽  
Mechanistic Models ◽  
Two Phase ◽  
Model Predictions ◽  
Flow Pattern Transition ◽  
Mathematical Equations ◽  
Phase Mixture ◽  
Two Phases

In this paper the transition boundaries between different flow regimes during cocurrent upflow of gas liquid two-phase mixture through concentric annuli has been predicted theoretically. On the basis of the experimental observations (Das et al., 1999), mechanistic models have been proposed to formulate mathematical equations of the regime boundaries as functions of the annulus dimensions, the physical properties, and velocities of the two phases. The analysis has yielded the bubbly-slug transition to occur at a limiting void fraction of 0.2, and the slug-churn transition to occur due to flooding of the liquid films by the Taylor bubbles. A comparison of the model predictions with experimental data corroborate the suitability of the proposed mechanisms.

COLMONOY 730

Alloy Digest ◽  
1998 ◽  
Vol 47 (11) ◽  
Keyword(s):  
Physical Properties ◽  
Tungsten Carbide ◽  
Matrix Alloy ◽  
Powder Metal ◽  
Fine Particulate ◽  
Carbide Particles

Abstract Colmonoy 730 is a tough Ni-Cr-W matrix alloy that holds extremely hard tungsten-carbide particles with a finer mesh tungsten carbide than Colmonoy 750 (Alloy Digest Ni-546, October 1998). The alloy is used on pump plungers and sleeves for protection from fine-particulate abrasive conditions. Colmonoy 730 minimizes packing wear. The alloy is finished by grinding. This datasheet provides information on composition, physical properties, microstructure, and hardness. It also includes information on machining, joining, and powder metal forms. Filing Code: Ni-547. Producer or source: Wall Colmonoy Corporation.

COLMONOY No. 635

Alloy Digest ◽  
1996 ◽  
Vol 45 (1) ◽  
Keyword(s):  
Physical Properties ◽  
Tungsten Carbide ◽  
Heat Treating ◽  
Powder Metal ◽  
Nickel Base ◽  
Carbide Particles

Abstract Colmonoy No. 635, a Nickel-base hard surfacing Alloy, contains a formulated mixture of both crushed and atomized powders. It achieves a hardness of RC 58-63 with tungsten carbide particles. Typical applications include hardfacing of pump components and shaft sleeves. It is supplied as a powder for aplication with Wall Colmonoy’s SPRAYWELD Process. This datasheet provides information on composition, physical properties, microstructure, and hardness. It also includes information on heat treating, machining, and powder metal forms. Filing Code: Ni-495. Producer or source: Wall Colmonoy Corporation.

scholarly journals The influence of the WC-Co composite microstructure model on stress field heterogeneity at the microstructure level: FEM based study

2019 ◽  
Vol 26 (1) ◽  
pp. 134-146 ◽  
Author(s):  
Witold Ogierman ◽  
Wojciech Grzegorzek
Keyword(s):  
Finite Element ◽  
Stress Field ◽  
Tungsten Carbide ◽  
Three Dimensional ◽  
Stress Distributions ◽  
Two Phase ◽  
Microstructure Model ◽  
Field Heterogeneity ◽  
Three Dimensional Models ◽  
Carbide Particles

AbstractThe paper is devoted to finite element method based study of stress field heterogeneity at microstructure level of two-phase cemented carbides. Special attention is put on investigation of influence of the microstructure model type on the stress field distributions. Two- and three-dimensional models of the microstructures have been generated. Moreover, two different representations of the microstructure have been considered. The first one assumes uniformly distributed cobalt phase forming continuous boundaries between tungsten carbide particles. The second one assumes that the cobalt phase shape and distribution are created in a way that allows for no differentiation of continuous boundaries between tungsten carbide grains. Finite element analyses have been carried out with different microstructure models. The results of the simulations are stress distributions in each phase of the material. Furthermore, a numerical homogenization has been conducted to investigate the phase properties’ influence on the effective elastic constants of the cemented carbide.

COLMONOY No. 83 PTA

Alloy Digest ◽  
1995 ◽  
Vol 44 (12) ◽  
Keyword(s):  
Wear Resistance ◽  
Compressive Strength ◽  
Physical Properties ◽  
Tungsten Carbide ◽  
Tensile Properties ◽  
Powder Metal ◽  
Application Method ◽  
Plasma Transferred Arc ◽  
Transferred Arc ◽  
Nickel Base

Abstract COLMONOY No. 83 PTA is a nickel-base hard surfacing alloy containing tungsten carbide. The application method is plasma transferred arc and the application is designed to protect extrusion screws. This datasheet provides information on composition, physical properties, microstructure, hardness, tensile properties, and compressive strength. It also includes information on wear resistance as well as machining and powder metal forms. Filing Code: Ni-493. Producer or source: Wall Colmonoy Corporation.

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.

UNILOY 326

Alloy Digest ◽  
1970 ◽  
Vol 19 (7) ◽  
Keyword(s):  
Stainless Steel ◽  
Corrosion Resistance ◽  
Physical Properties ◽  
Stress Corrosion ◽  
Tensile Properties ◽  
High Strength ◽  
Heat Treating ◽  
Distinct Advantage ◽  
Two Phase ◽  
Stress Corrosion Resistance

Abstract UNILOY 326 is a two-phase, ferromagnetic stainless steel characterized by high strength and very good general and stress corrosion resistance. It has distinct advantage for the fastener industry. 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: SS-241. Producer or source: Cyclops.

Big Data Privacy Preservation Using Two Phase Top-Down Specialization Algorithm with Multidimensional Map Reduce Framework on Hadoop

2015 ◽  
Vol 3 (2) ◽  
Author(s):  
Shalin Eliabeth S. ◽  
Sarju S.
Keyword(s):  
Big Data ◽  
Data Privacy ◽  
Privacy Preservation ◽  
Experimental Result ◽  
Map Reduce ◽  
Distributed Environment ◽  
Top Down ◽  
Two Phase ◽  
Data Anonymization ◽  
Big Data Privacy

Big data privacy preservation is one of the most disturbed issues in current industry. Sometimes the data privacy problems never identified when input data is published on cloud environment. Data privacy preservation in hadoop deals in hiding and publishing input dataset to the distributed environment. In this paper investigate the problem of big data anonymization for privacy preservation from the perspectives of scalability and time factor etc. At present, many cloud applications with big data anonymization faces the same kind of problems. For recovering this kind of problems, here introduced a data anonymization algorithm called Two Phase Top-Down Specialization (TPTDS) algorithm that is implemented in hadoop. For the data anonymization-45,222 records of adults information with 15 attribute values was taken as the input big data. With the help of multidimensional anonymization in map reduce framework, here implemented proposed Two-Phase Top-Down Specialization anonymization algorithm in hadoop and it will increases the efficiency on the big data processing system. By conducting experiment in both one dimensional and multidimensional map reduce framework with Two Phase Top-Down Specialization algorithm on hadoop, the better result shown in multidimensional anonymization on input adult dataset. Data sets is generalized in a top-down manner and the better result was shown in multidimensional map reduce framework by the better IGPL values generated by the algorithm. The anonymization was performed with specialization operation on taxonomy tree. The experiment shows that the solutions improves the IGPL values, anonymity parameter and decreases the execution time of big data privacy preservation by compared to the existing algorithm. This experimental result will leads to great application to the distributed environment.

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