The Formation of Cracks in Cast-Iron Molds during the Casting of Zinc Blocks

2015 ◽  
Vol 729 ◽  
pp. 119-124
Author(s):  
Mikhail Alekhsandrovich Ivanov
Keyword(s):  
Cast Iron ◽  
Thermal Shock ◽  
Directional Solidification ◽  
Crack Formation ◽  
Thermal Cycles ◽  
Molten Zinc ◽  
Casting Technology ◽  
Formation Of Cracks ◽  
Iron Mold

The article considers the problem of cracks formation in cast-iron molds during the casting of zinc blocks. The analysis of casting technology for manufacturing of cast-iron molds is performed. Changes of the construction of cast-iron molds is implemented to ensure the directional solidification. The analysis of thermal cycles of cast-iron molds during its operation is performed. It is established that the most dangerous moment of crack formation is the beginning of the pouring of molten zinc in the cold cast-iron mold. The new composition of the separation insulating coating, which reduces thermal shock and the probability of crack formation is developed.

scholarly journals The crack formation of concrete slabs embedded along two sides with minimum area of steel reinforcement

2020 ◽  
Vol 310 ◽  
pp. 00059
Author(s):  
Sergej Priganc
Keyword(s):  
Laboratory Test ◽  
Crack Formation ◽  
Concrete Slab ◽  
Steel Reinforcement ◽  
Concrete Slabs ◽  
Transverse Reinforcement ◽  
Minimum Area ◽  
Four Point Bending ◽  
Formation Of Cracks ◽  
Two Sides

The article deals with crack formation of concrete slabs embedded along two sides, after monitoring the shrinking of concrete slabs under laboratory conditions. The paper presents result of laboratory test focused on monitoring the crack formation of concrete slabs. The concrete slabs were reinforced asymmetrically only on one side. The slabs were loaded by four-point bending. The formation and development of cracks was monitored during loading of concrete slabs. The deflections on the concrete slab were measured and the formation of cracks and the width of the cracks were monitored. The position of the cracks on the concrete slab was checked and compared with the position of the transverse reinforcement.

scholarly journals Thermal Shock and Thermal Fatigue of Cast Iron

1963 ◽  
Vol 12 (114) ◽  
pp. 184-189 ◽  
Author(s):  
Shuji TAIRA ◽  
Masateru OHNAMI ◽  
Tadashi SHIRAISHI
Keyword(s):  
Cast Iron ◽  
Thermal Shock ◽  
Thermal Fatigue

Influence of Processing Methods on Number and Form of Cracks of Bionic Units on Vermicular Cast Iron

2012 ◽  
Vol 499 ◽  
pp. 350-354
Author(s):  
Yan Liu ◽  
Hong Zhou ◽  
Jing Yan Cheng ◽  
Lu Quan Ren
Keyword(s):  
Cast Iron ◽  
Network Structure ◽  
Thermal Cycles ◽  
Processing Methods ◽  
Laser Process

This paper focuses on the influence of processing methods on the cracks’ number and form of bionic units on the vermicular cast iron. The results show that there have already been cracks on the bionic units’ surface, and the crack number increases with the thermal cycles. The crack’s form on bionic units processed in air is tree-like structure, and that of bionic units processed in water is network structure. The twice laser process and the electro-pulsing treatment can effectively reduce the crack number of the bionic units processed in water, without changing the form.

scholarly journals Formation of Cracks in Ice Plates by Thermal Shock

Nature ◽  
1961 ◽  
Vol 192 (4798) ◽  
pp. 130-131 ◽  
Author(s):  
L. W. GOLD
Keyword(s):  
Thermal Shock ◽  
Formation Of Cracks

Cyclic Fracture Analysis of Semi-Natural Cast Iron Plate with Metallurgical Defects Layer

2010 ◽  
Vol 165 ◽  
pp. 61-65
Author(s):  
Marius Gutauskas ◽  
Jonas Bacevičius ◽  
Mindaugas Kazimieras Leonavičius
Keyword(s):  
Cast Iron ◽  
Cyclic Load ◽  
Fracture Process ◽  
Crack Formation ◽  
Fracture Analysis ◽  
Electronic Microscopy ◽  
Pure Bending ◽  
Iron Plate ◽  
Metallurgical Defects ◽  
Total Fracture

Fatigue fracture of the semi-natural cast iron plate with dross and carbon float defects was analyzed. Crack formation and propagation were traced under the programmable cyclic load of the pure bending. The focuses of the crack and their consistent pattern up to the total fracture were determined. Fracture analysis was performed by using optical and electronic microscopy methods. High-cycle fracture mechanism was established when the number of the cycles exceeded 108. The influence of the microstructure upon fracture process was investigated.

THE MECHANISM OF THE FORMATION OF CRACKS IN THE LASER-DEPOSITED NICKEL ALLOY SYSTEM NI–CR–B–SI ON THE SURFACE OF STRUCTURAL STEEL TYPE 30CGSA

2020 ◽  
pp. 3-10
Author(s):  
V. P. Morozov ◽  
Yu. G. Romanov
Keyword(s):  
High Temperature ◽  
Crack Formation ◽  
Alloy System ◽  
Powder Materials ◽  
High Temperature Region ◽  
Second Stage ◽  
Stage Of Development ◽  
Small Cracks ◽  
Formation Of Cracks ◽  
Technological Strength

The mechanism of crack formation in the deposited layers is investigated. In accordance with this mechanism, cracks are of the nature of “hot” cracks. The reasons that enhance crack formation during surfacing of powder materials of the Ni–Cr–B–Si system are examined and identified. Foci of “hot” small cracks are formed, as a rule, in the high-temperature region. At the second stage, the focus develops, developing into transcrystalline destruction. The second stage of development is associated with the process of accumulation of internal welding stresses in the area of the source. The main parameters that determine the technological strength of the metal during surfacing or welding are: the length of the temperature range of brittleness (TIC), the level of ductility of the metal in the TIC and the intensity of the shrinkage deformation of the metal in the TIC. It was established that it is possible to increase the service life of the restored product several times in comparison with the new part by eliminating cracks in the deposited layer.

Casting Process and Simulation of 50-60017-00 Pulley

2014 ◽  
Vol 1033-1034 ◽  
pp. 1265-1270
Author(s):  
Cheng Cheng Xing ◽  
Jin Ning Yang ◽  
Long De Xie ◽  
Gang Yang ◽  
Yi Yang
Keyword(s):  
Cast Iron ◽  
Liquid Metal ◽  
New Technology ◽  
Casting Process ◽  
Nodular Cast Iron ◽  
Commercial Software ◽  
Casting Technology ◽  
Cold Iron

Currently, the casting process of pulley is a hot and difficult topic in industry. As the production of the nodular cast iron pulley requires chill for final feeding in the traditional casting technology. To avoid the cold iron in casting process, this paper presents a new technology for 50-60017-00 type pulley. Simulated results, obtained from commercial software "MAGMA", indicate that liquid metal fills the sand smoothly, and no porosity is found in the casting. Then, 20 pieces of samples were produced to test the performance, validating the proposed technology. Finally, the results could be applied to other designs of nodular cast iron pulley process.

Thermal Shock on Cylinder Head Induced by High Power Laser

2012 ◽  
Vol 170-173 ◽  
pp. 266-269
Author(s):  
Ming Pang ◽  
Chang Zhen Liu ◽  
Zhi Min Xie ◽  
Guang Hui Xu
Keyword(s):  
Cast Iron ◽  
Thermal Shock ◽  
Cylinder Head ◽  
Ccd Camera ◽  
Optical Microscope ◽  
High Power Laser ◽  
Power Laser ◽  
Fatigue Specimen ◽  
Graphite Cast Iron ◽  
Scanning Electron

Experiment of thermal shock was conducted by laser on cylinder head of graphite cast iron. Infrared pyrometers were mounted on the top of the workbench to sample the transient surface temperatures. The high resolution CCD camera was employed to sample transient images of the cylinder head. Microstructure of thermal shocking specimen was characterized by scanning electron microscopy (SEM) and optical microscope (OM). Mechanical properties of thermal fatigue specimen were evaluated by hardness. Results show that microstructure and hardness are not obviously changed, which mean that cylinder head of graphite cast iron has performance stabilization within the rang of thermal shocking temperature.

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