scholarly journals STRUCTURAL INVESTIGATION OF THE INTERMEDIATE LAYER IN A BIMETAL MILL ROLLER PRODUCED BY THE METHOD OF VERTICAL AXIS CENTRIFUGAL CASTING

2021 ◽  
Vol 1 ◽  
pp. 255-258
Author(s):  
Angel Velikov ◽  
Ivanov Ivanov ◽  
Ivan Georgiev
Keyword(s):  
Cast Iron ◽  
Structural Changes ◽  
Structural Investigation ◽  
Diffusion Processes ◽  
Centrifugal Casting ◽  
Vertical Axis ◽  
Ductile Cast Iron ◽  
High Chromium ◽  
Supporting Layer ◽  
Mill Roller

Subject of the investigation is a bimetallic mill roller with external, working layer from high chromium material and inner, supporting layer from ductile cast iron. The processes, accompanying the formation of a transition layer in bimetallic castings, produced by centrifugal casting have been investigated. Attention has paid to the structural changes in the transition zone, caused by the diffusion processes occurring during the casting and crystallization.

scholarly journals STRUCTURAL INVESTIGATION OF A HIGH-CHROMIUM MATERIAL USED AS AN EXTERNAL, WORKING LAYER OF A BIMETALLIC MILL ROLLER

2021 ◽  
Vol 1 ◽  
pp. 91-94
Author(s):  
Peter Ivanov ◽  
Ivan Georgiev ◽  
Angel Velikov
Keyword(s):  
Mathematical Model ◽  
Software Package ◽  
Structural Investigation ◽  
Centrifugal Casting ◽  
Vertical Axis ◽  
High Chromium ◽  
Working Layer ◽  
Mill Roller

The bimetallic mill roller has been produced by the method of vertical axis centrifugal casting. The processes, accompanying the formation of the structure of the external (working) layer from high chromium material of the bimetallic roller have been investigated. A mathematical model for the geometry of the working layer was created. By using the MAGMA Soft software package, simulations of the processes of casting and crystallization have been made. A metallographic assessment of the microstructure has been made. 

Interfacial Characteristics and Wear Resistance of WCp/White-Cast-Iron Composites

2007 ◽  
Vol 26-28 ◽  
pp. 293-296 ◽  
Author(s):  
Guo Shang Zhang ◽  
Yi Min Gao ◽  
Jian Dong Xing ◽  
Shi Zhong Wei ◽  
Xi Liang Zhang
Keyword(s):  
Wear Resistance ◽  
Cast Iron ◽  
White Cast Iron ◽  
Centrifugal Casting ◽  
Casting Process ◽  
Iron Matrix ◽  
High Chromium ◽  
X Ray ◽  
High Chromium Cast Iron ◽  
Wear Tests

To improve the wear resistance of high chromium white cast iron under severe abrasive conditions, a composites layer was designed for wear surface, which were locally reinforced with WC particles. And the local composites were successfully fabricated by optimized centrifugal casting process. Then the interface between WC and iron matrix was analyzed with scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX) and X-ray diffraction (XRD). And three body wear tests were carried out on a self-made rig to investigate the wear resistance of the composites. For comparison, the wear tests of high chromium white cast iron were also carried out under the same conditions. The results show that: There are no defects such as inclusion, crack, gas pore and so on in the obtained composites layer, which with a uniform thickness of 10 mm. WC particles are homogeneously distributed in the composites layer and tightly bonded with the iron matrix. The WC particles are partially dissolved in the iron matrix during centrifugal casting. The elements W, C and Fe react to form new carbides such as Fe3W3C or M23C6, which precipitate around former WC particles during subsequent solidification. So the interface between WC particles and the iron matrix is a strong metallurgical bonding. WC particles in the composites layer can effectively resist cutting by the abrasive, and then protect the matrix. The wear resistance of the composites layer is 7.23 times of that of high chromium cast iron.

Study on the (Fe,Cr)7C3 Particles Reinforced Iron-Based Composite Coating

2014 ◽  
Vol 809-810 ◽  
pp. 569-572
Author(s):  
Li Bin Niu ◽  
Zhen Xu ◽  
Jian Hong Peng
Keyword(s):  
Cast Iron ◽  
Composite Coating ◽  
Composite Coatings ◽  
Centrifugal Casting ◽  
Energy Dispersive Spectrum ◽  
Optical Microscope ◽  
Ductile Cast Iron ◽  
In Situ Techniques ◽  
Pin On Disc ◽  
Iron Based

An iron based composite coating reinforced by (Fe,Cr)7C3particles, with a thickness of 4.0 mm, was fabricated on the ductile cast iron substrate by means of a centrifugal casting and in situ techniques. The microstructure and properties of the composite coatings were investigated by optical microscope, X-ray diffraction, scanning electron micrograph, energy dispersive spectrum, microhardness tester and pin-on-disc wear tester. Results show that the composite coatings consists of primary (Fe,Cr)7C3carbides as the reinforcing phase and interdendritic (Fe,Cr)7C3/γ eutectics accompanied by negligible graphite nodules as the matrix. The reinforcements are metallurgical bonded to the ductile cast iron substrate. Compared with unreinforced ductile cast iron, the composite coatings offer virtually a unique wear resistant behaviour under the condition of dry sliding with loads.

Nondestructive Inspection of Ductile Cast Iron by Measurement of Minor Magnetic Hysteresis Loops

2010 ◽  
Vol 659 ◽  
pp. 355-360
Author(s):  
Gábor Vértesy ◽  
Tetsuya Uchimoto ◽  
Toshiyuki Takagi ◽  
Ivan Tomáš
Keyword(s):  
Cast Iron ◽  
Structural Changes ◽  
Magnetic Hysteresis ◽  
Hysteresis Loops ◽  
Adaptive Testing ◽  
Ferromagnetic Materials ◽  
Ductile Cast Iron ◽  
Magnetic Hysteresis Loops ◽  
Magnetic Adaptive Testing ◽  
Non Destructive

Systematic measurement of minor magnetic hysteresis loops of traditional hysteresis tests requires substantially lower magnetization of samples and offers higher sensitivity of detection of changes in the ferromagnetic materials’ microstructure. The keynote idea of this method, called Magnetic Adaptive Testing (MAT) is utilization of sensitive correlations between the varied microstructure of the magnetized material and the corresponding, highly sensitive modifications of some of the minor hysteresis loops. The paper presents some of the recent results of the MAT measurement performed on specially prepared series of cast iron samples. Results of the non-destructive magnetic tests were compared with the destructive mechanical measurements of Brinell hardness and linear correlation was found between them. A very good correlation was also found between magnetic descriptors and conductivity and chill/ferrite area fraction. Based on these results, Magnetic Adaptive Testing is suggested as a highly promising non-destructive method for monitoring structural changes in different types of ferromagnetic materials.

Failure Analysis and Research Progress of Resurfacing Welding Material of Coal Mill Roller

2013 ◽  
Vol 873 ◽  
pp. 514-518
Author(s):  
Li Ping Gu ◽  
Shao Guang Liu ◽  
Dong Liang Gu ◽  
Yu Song Xu
Keyword(s):  
Cast Iron ◽  
Low Cost ◽  
Research Progress ◽  
Cored Wire ◽  
High Chromium ◽  
High Chromium Cast Iron ◽  
Key Word ◽  
Chromium Cast Iron ◽  
Research Situation ◽  
Mill Roller

Failure mode of coal mill roller was comprehensively analyzed and current situation of mill roller repair was elaborated. Process characteristic and application effect of metal cerement and high chromium cast iron building-up materials were expounded in the article. Owing to excellent wear resistant and low cost, high chromium cast iron building-up materials have been applied widely. The current research situation of self-shielded flux-cored wire with high chromium cast iron was summarized and the existing problem and probable solution were pointed. Key word: Coal mill roller, Abrasive wear, Flux-cored wire, Resurfacing welding

Effect of the structural changes on the mechanical properties of the sintered films

2016 ◽  
Vol 12 (1) ◽  
pp. 4141-4144
Author(s):  
Garima Jain
Keyword(s):  
Crystallite Size ◽  
Lattice Constant ◽  
Structural Changes ◽  
Structural Investigation ◽  
Energy Gap ◽  
Lattice Parameter ◽  
Metal Chalcogenides ◽  
Optical Energy Gap ◽  
Tin Telluride ◽  
Physical Quantities

Polycrystalline films of tin telluride were prepared by sintering technique. The structural investigation of the films with different thicknesses enables to determine lattice parameter, crystallite size and strain existing in the films. The XRD traces showed that strain was tensile in nature. The crystallite size increases with thickness while strain decreases. Higher the value of tensile strain, larger is the lattice constant. The optical energy gap shows a descending nature with increasing strain and so with the lattice constant. Such an attempt made to delve into interdependence of basic physical quantities helps to explore the properties of SnTe and utilize it as an alternative to heavy metal chalcogenides in various technological applications.  

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