scholarly journals QUESTION OF APPLICABILITY OF THE CALCULATION ASSESSMENT METHOD OF RESISTANCE FOR DETAILS AFTER THERMAL DIFFUSION HARDENING

2018 ◽  
Vol 15 (3) ◽  
pp. 412-420 ◽  
Author(s):  
V. E. Ovsyannikov ◽  
V. I. Vasilyev
Keyword(s):  
Cast Iron ◽  
Thermal Diffusion ◽  
Gray Cast Iron ◽  
High Strength ◽  
Assessment Method ◽  
Gray Cast ◽  
Specific Work ◽  
Experimental Check ◽  
Steel Disk

Introduction.The article discusses the question of applicability of the calculation assessment method of resistance for details from gray cast iron after thermal diffusion hardening. The purpose of research is to check applicability of the calculated model for determination of intensity in case of the variable blanket hardness.Materials and methods.The model of intensity dependence on contact of two disks of friction gear is used in the research. Calculated determination of parameters is executed in two options: contact of the steel disk and disk from gray cast iron with the strengthened layer, and contact of the steel disk and disk from the tempered high-strength cast iron. Thus, roughness corresponding to the earned extra surface in contact zone is created. Experimental check of received results is carried out by means of specific work of abrasive wear definition for gray cast iron with the strengthened layer and the high-strength tempered cast iron.Results.As a result, it was established that the resistance of details from gray cast iron with the strengthened layer is comparable to high-strength cast iron after hardening. The results of experimental check prove the obtained calculations since the parameters values of resistance received would be well coordinated. Therefore, the possibility of the calculated resistant technique usage for such case could be considered as proved one and, therefore, it could be used at design calculations of the frictional units containing details from gray cast iron with the strengthened layer.Discussion and conclusions.The considered way of superficial hardening needs to be applied depending on features of operation on frictional unit. In such case, when the allowed values of wear change in wide limits (for example, brakes, coupling, etc.) it would be better not to subject a blanket to machining where the formation of optimum parameters of friction surfaces happened in natural way, or it would be necessary to delete an allowance. This suggests that the calculation method of the determination of layer resistance enables to define concrete values of an allowance which needs to be deleted.

ISO 185/JL/350

Alloy Digest ◽  
2021 ◽  
Vol 70 (9) ◽  
Keyword(s):  
Thermal Conductivity ◽  
Tensile Strength ◽  
Cast Iron ◽  
Gray Cast Iron ◽  
High Strength ◽  
Heat Treating ◽  
Gray Cast ◽  
Spheroidal Graphite ◽  
Cast Irons ◽  
Test Pieces

Abstract ISO 185/JL/350 is a higher-tensile-strength gray cast iron that has a pearlitic matrix, and a tensile strength of 350–450 MPa (51–65 ksi), when determined on test pieces machined from separately cast, 30 mm (1.2 in.) diameter test bars. It provides a combination of high strength while still maintaining good thermal conductivity compared with other types of cast iron. This grade approaches the maximum tensile strength attainable in gray cast iron. Applications therefore tend to be confined to those where thermal conductivity requirements in service preclude the use of one of the other higher-strength materials such as spheroidal graphite cast irons, which have inferior thermal properties. This datasheet provides information on composition, physical properties, and tensile properties. It also includes information on wear resistance as well as casting and heat treating. Filing Code: CI-85. Producer or source: International Organization for Standardization.

Study on the Influences on Microstructure and Properties of High-Strength Grey Cast Iron in Addition to Alloying Elements Nb

2013 ◽  
Vol 800 ◽  
pp. 221-224
Author(s):  
Jun Tao Zhang ◽  
Feng Zhang Ren
Keyword(s):  
Cast Iron ◽  
Gray Cast Iron ◽  
Mechanical Performance ◽  
High Strength ◽  
Optical Microscope ◽  
Gray Cast ◽  
Dynamic Strain ◽  
Cast Irons ◽  
Grey Cast ◽  
The Relationship

The increase of the strength of gray cast iron is mainly depended on alloying. However, with the improvement of strength, its processing performance will always decrease. So three different gray cast irons are studied in this experiment, including adding 0.1% Nb elements, adding 0.2% Nb elements and adding 0.3% Nb elements, to investigate the Nbs effect to the mechanical performance of gray cast iron, we adopt Dynamic Strain Amplifier to measure cutting force to evaluate processing performance, use Optical Microscope and Electron Microscopy observe each samples organization, explains the relationship between Nbs content and the mechanical and processing performance of gray cast iron from micro-level. Finally, we draw the conclusion: when the Nb comes to 0.3 percent, the appearance of E-type graphite and Nb carbide durum granular will greatly decrease its processing performance.

218 Development of the nanocrystalline carbon iron alloy that has high strength based on the gray cast iron

2006 ◽  
Vol 2006.44 (0) ◽  
pp. 77-78
Author(s):  
Hisashi OGAWA ◽  
Kenji HATANAK ◽  
Nobuaki MIYAO ◽  
Harumatsu MIURA ◽  
Kazuo ODA
Keyword(s):  
Cast Iron ◽  
Gray Cast Iron ◽  
Iron Alloy ◽  
High Strength ◽  
Gray Cast ◽  
Strength Based ◽  
Carbon Iron

On the Problems with Carbide Formation in Gray Cast Iron

1984 ◽  
Vol 34 ◽  
Author(s):  
R. B. Gundlach ◽  
J. F. Janowak ◽  
S. Bechet ◽  
K. Rohrigtt
Keyword(s):  
Cast Iron ◽  
Gray Cast Iron ◽  
Low Cost ◽  
High Strength ◽  
Gray Iron ◽  
Gray Cast ◽  
Carbide Formation ◽  
Past Half Century ◽  
Iron Technology ◽  
Engine Blocks

Gray iron technology has advanced greatly in the past half century. Much has been learned about the mechanisms of nucleation and solidification and about solid state transformations. This information has alloweu gray iron castings to remain competitive for structural components. Low cost and excellent castability make them versatile for a wide variety of industrial components including engine blocks, cylinder heads, housings, manifolds, hydraulic valve bodies and many other castings of similar complexity. Gray cast iron provides the technical advantages of high strength, soundness, good machinability, dimensional stability and uniformity of properties usually required by such cast components. Achieving these characteristics is dependent, however, on achieving proper and uniform structures tnrougnout all sections of the casting. This objective is reaoily attainable in judiciously alloyed gray cast iron.

scholarly journals High-strength gray cast iron exceeding 400MPa.

Materia Japan ◽  
1994 ◽  
Vol 33 (6) ◽  
pp. 791-792
Author(s):  
AKIRA HORIE
Keyword(s):  
Cast Iron ◽  
Gray Cast Iron ◽  
High Strength ◽  
Gray Cast

Effect of Ar Purification on Microstructure and Properties of High Strength Gray Cast Iron

2011 ◽  
Vol 266 ◽  
pp. 241-245
Author(s):  
Juan Yang ◽  
Sheng Xin Liu ◽  
Qi Fei Hou ◽  
Hua Wei Sun ◽  
Yu Fu Sun ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Cast Iron ◽  
Optical Microscopy ◽  
Gray Cast Iron ◽  
High Strength ◽  
Gray Cast ◽  
Metallographic Examination ◽  
Iron Castings ◽  
Graphite Morphology ◽  
Quality Indexes

The effects of Ar purification on the impurity characteristic, graphite morphology and quality indexes of high strength gray cast iron were investigated by microstructures analysis and mechanical properties examination. The results show that there are a large amount of particles and floccule impurities in the specimens without Ar purification. The granular impurities usually have been incorrectly considered as “C-type” graphite observed by optical microscopy in the metallographic examination in the practical production of small and medium high strength gray cast iron castings. The amount of impurities is greatly decreased and the quality indexes of high strength gray cast iron with Ar purification are markedly improved.

scholarly journals Fabrication of High-Strength Gray Cast Iron Using Permanent Magnet Scrap

2017 ◽  
Vol 62 (2) ◽  
pp. 1113-1117
Author(s):  
Seung-Yeon Park ◽  
J.H. Kim ◽  
S.J. Seo ◽  
J.S. On ◽  
K.M. Lim
Keyword(s):  
Tensile Strength ◽  
Cast Iron ◽  
Permanent Magnet ◽  
High Performance ◽  
Gray Cast Iron ◽  
High Strength ◽  
Cost Effective ◽  
Gray Cast ◽  
Cast Irons ◽  
Cast Specimen

AbstractIn this study, we have developed the manufacturing technology for high strength gray cast irons by using the spent permanent magnet scraps. The cast specimen inoculated by using a spent magnet scraps showed the excellent tensile strength up to 306MPa. This tensile strength value is 50MPa higher than that of the specimen cast without inoculation, and is similar to that of the specimen inoculated by using the expensive misch-metal. These superior mechanical properties are attributed to complex sulfides created during solidification that promote the formation and growth of Type-A graphite. It is therefore concluded that spent magnets scrap can provide an efficient and cost-effective inoculation agent for the fabrication of high-performance gray cast iron.

Research of Properties and Microstructure on High-Strength Casting of Turbo-Charger

2011 ◽  
Vol 328-330 ◽  
pp. 1292-1296
Author(s):  
An Xia Pan
Keyword(s):  
Cast Iron ◽  
Gray Cast Iron ◽  
Continuous Production ◽  
High Strength ◽  
Intermediate Frequency ◽  
Gray Cast ◽  
Thin Wall ◽  
Test Results ◽  
Thin Walls ◽  
Turbo Charger

Combining with productive practice, production of intermediate castings in high-strength turbochargers under the condition of intermediate frequency furnaces is analysed in this paper. By adopting measures of compound inoculation and increasing Sulfur, 95% type A graphite and high-strength intermediate castings whose tensile strength is 300 MPa are acquired. Furthermore, moderate amounts of S and Mn as well as CE values are determined according to test results. As for thin-wall gray cast iron with high strength and complicate structure, whenwSis low andwCis high, castings with good graphite form can be produced. But it is not stable and the strength is low. Adding inoculants like Calballoy and Si-Ca-Ba can significantly improve the graphite form on the edge of thin-walls. WhenwCis stabilized at about 4.1, stable and continuous production of high strength gray cast iron with good graphite form can be guaranteed by adding sulfur and controlling the amount of Mn. The proportion of A type graphite and that of pearlite are both more than 90%.When high-strength gray cast iron is produced in intermediate frequency furnaces,wSshould be controlled between 0.1% and 0.12% andwMnshould be controlled between 0.5% and 0.55%.

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