scholarly journals Increase of strength of cast-iron cylinder liners of engines of road construction vehicles

2020 ◽  
Vol 1 (3) ◽  
pp. 36-40
Author(s):  
V.E. Ovsyannikov ◽  
◽  
G.N. Shpitko ◽  
R.Yu. Nekrasov ◽  
D.E. Vas'kov ◽  
...  
Keyword(s):  
Cast Iron ◽  
Thermal Treatment ◽  
Gray Cast Iron ◽  
Experimental Studies ◽  
Road Construction ◽  
Hardened Layer ◽  
Gray Cast ◽  
Urgent Problem ◽  
Ansys Software ◽  
Cylinder Liners

Cylinder liners made of gray cast iron are quite widespread in the design of engines of road con-struction vehicles. The negative properties of this structural material include relatively low strength and high fragility. This increases the probability of both manufacturing and operational defects. Therefore, improving the performance of the considered parts is an urgent problem. A promising direction in this case is the use of chemical-and-thermal treatment. The aim of the work is to study the effect of chemical-and-thermal treatment of gray cast iron on strength. The paper investigates the strength of cast iron subjected to chemical-and-thermal treatment (thermal diffusion surface al-loying). On the basis of experimental studies, the effect of the thickness of the hardened layer on the strength was studied. A numerical model is created in the Ansys software. The effect of the hardened layer on the strength of cylinder liners of engines of road-building vehicles is investigated.

Cylinder Liner in Ductile Cast Iron for High Loaded Combustion Diesel Engines

2011 ◽  
Author(s):  
Edney Deschauer Rejowski ◽  
Edmo Soares ◽  
Ingo Roth ◽  
Steffen Rudolph
Keyword(s):  
Mechanical Properties ◽  
Cast Iron ◽  
Wall Thickness ◽  
Diesel Engines ◽  
Ductile Iron ◽  
Gray Cast Iron ◽  
Young Modulus ◽  
Gray Cast ◽  
Cast Material ◽  
Cylinder Liners

With the increase of combustion loading and the trend to reduce engine size, there is a need for thinner but stronger wet cylinder liners. While most of the current cylinder liners are made of gray cast iron, due to its good tribological behavior, machinability performance and competitive price, alternative casting materials like compact graphite iron, ductile iron and even steel are being considered to cover the future engine demands. In this paper, a new ductile iron (DI) cast material for wet cylinder liners is presented. The material has about 60 and 70% higher limits respectively for tensile stress and fatigue resistance as compared to conventional gray cast irons, but without penalty on the tribological properties. There is also a potential improvement to avoid cavitation on the outside surface due to its higher young modulus, which also equates to a higher stiffness. The tested cylinder liners were induction hardened on the running surface and a slide hone process was used to improve wear and scuffing resistance. The liners were tested in a HDD engine with PCP of 245 bar and showed similar wear as observed with conventional cylinder liners of gray cast iron material. The DI cylinder liners were also tested in an abusive scuffing engine test without any concern. The improved mechanical properties of the described new DI material introduce possibilities to reduce liner wall thickness or increase specific output. The preliminary evaluation in this paper showed that this new material is feasible for HDD diesel engines with PCP up to 250 bar. In cases that the customer needs to increase the bore diameter for output reasons there is the potential to reduce the liner wall thickness up to 25% based on high mechanical properties (UTS, Young Modulus and fatigue strength). In both cases, it’s recommended a FEA analysis to support the new component design.

Influence of chemical composition and microstructure of gray cast iron on wear of heavy duty diesel engines cylinder liners

Wear ◽  
2007 ◽  
Vol 263 (7-12) ◽  
pp. 1158-1164 ◽  
Author(s):  
J. Keller ◽  
V. Fridrici ◽  
Ph. Kapsa ◽  
S. Vidaller ◽  
J.F. Huard
Keyword(s):  
Cast Iron ◽  
Chemical Composition ◽  
Diesel Engines ◽  
Gray Cast Iron ◽  
Gray Cast ◽  
Heavy Duty ◽  
Heavy Duty Diesel ◽  
Cylinder Liners

scholarly journals Increasing wear resistance of the protective sleeve of the centrifugal pump made of gray cast iron by surface hardening

2021 ◽  
pp. 103
Author(s):  
Nataliia Lalazarova ◽  
Оlga Afanasieva ◽  
Olena Popova ◽  
Oleksiy Dmytrenko
Keyword(s):  
Wear Resistance ◽  
Cast Iron ◽  
High Frequency ◽  
Gray Cast Iron ◽  
Operating Time ◽  
Hardened Layer ◽  
Gray Cast ◽  
Centrifugal Pumps ◽  
Surface Quenching ◽  
Surface Induction

One of the weak spots that reduce the guaranteed operating time of centrifugal pumps is the assembly that includes the seal and protective sleeves. The main purpose of the bushings in the rotor kit is to protect the shaft from corrosion, erosion and wear. The sleeve operates under abrasive wear conditions by packing elements and abrasive particles that get into the liquid pumped by the pump. The protective sleeves made of gray cast iron do not meet the service life in connection with accelerated surface wear. Goal. The purpose of the work is to ensure high wear resistance of cast iron pump parts by heat treatment. Method. The chemical composition was determined on a portable laser analyzer Laser Z200 C +. The structure was studied using an optical microscope. The wear was investigated by the roller-block method on a friction machine. Surface quenching was carried out with a high-frequency lamp generator in a single-turn inductor. Results. The microstructure of gray cast iron as cast consists of pearlite, ferite, double phosphide eutectic and inclusions of lamellar graphite. Microhardness of small-lamellar pearlite is Н50 = 1550–2220 MPa, microhardness of phosphide eutectic is Н50 = 6500–8000 MPa. Surface induction quenching by high-frequency currents followed by low tempering is an effective way to increase the wear resistance of cast iron products of small cross-section and does not cause warping. Cast iron for surface quenching should have a pearlite structure, and graphite should be contained in the form of small inclusions. The optimal heating temperature for induction hardening was determined as 900 °С, which made it possible to obtain the microstructure of the hardened layer – martensite, double phosphide eutectic and graphite. Scientific novelty. The developed modes of surface quenching make it possible to preserve a double phosphide eutectic in the structure of the surface layer, which makes it possible to obtain high hardness and wear resistance of the hardened layer. Practical significance. Surface induction quenching with low tempering of cast gray iron increased its wear resistance by 2,4 times. The previous normalization had practically no effect on the durability of cast iron, since its structure contains less than 10% ferrite.

scholarly journals Revealing the technological modes range for ultrasonic surface hardening of cast iron

2018 ◽  
Vol 224 ◽  
pp. 03001
Author(s):  
Yulia Semenova ◽  
Yuri Nikitin ◽  
Andrey Rakhimyanov
Keyword(s):  
Mathematical Modeling ◽  
Cast Iron ◽  
Surface Hardening ◽  
Gray Cast Iron ◽  
Hardened Layer ◽  
Maximum Intensity ◽  
Gray Cast ◽  
Processing Conditions

Prospects of using the ultrasonic surface hardening of different materials as a way of achieving a simultaneous strengthening and finishing effects are presented. It is shown that this method is applicable for non-rigid and brittle parts. Thus, it allows processing gray cast iron. Therefore, the paper is devoted to establishing technologically significant parameters of ultrasonic surface hardening of particular gray cast iron. Research was conducted using mathematical modeling of the process. According to the calculations, the application of the modes revealed makes it possible to achieve the depth of the hardened layer up to 2 mm. Moreover, the parameters of the hardened layer, such as the diameter of a single imprint and the maximum intensity of deformation for specified processing conditions are calculated.

Cylinder Liner in Ductile Cast Iron for High Loaded Combustion Diesel Engines

2012 ◽  
Vol 134 (7) ◽  
Author(s):  
Edney Deschauer Rejowski ◽  
Edmo Soares ◽  
Ingo Roth ◽  
Steffen Rudolph
Keyword(s):  
Mechanical Properties ◽  
Cast Iron ◽  
Wall Thickness ◽  
Diesel Engines ◽  
Ductile Iron ◽  
Gray Cast Iron ◽  
Gray Cast ◽  
Preliminary Evaluation ◽  
Cast Material ◽  
Cylinder Liners

With the increase of combustion loading and the trend to reduce engine size, there is a need for thinner but stronger wet cylinder liners. While most of the current cylinder liners are made of gray cast iron, due to its good tribological behavior, machinability performance, and competitive price, alternative casting materials such as compact graphite iron, ductile iron, and even steel are being considered to address future engine demands. In this paper, a new ductile iron (DI) cast material for wet cylinder liners is presented. The material has about 60 and 70% higher limits, respectively, for tensile stress and fatigue resistance as compared to conventional gray cast irons, but without a penalty on the tribological properties. There is also a potential improvement to avoid cavitation on the outside surface due to its higher young modulus, which also equates to a higher stiffness. The tested cylinder liners were induction hardened on the running surface and a slide hone process was used to improve wear and scuffing resistance. The liners were tested in a heavy duty diesel (HDD) engine with a peak cylinder pressure (PCP) of 245 bar and showed similar wear as observed with conventional cylinder liners of gray cast iron material. The DI cylinder liners were also tested in an abusive scuffing engine test without any concern. The improved mechanical properties of the described new DI material introduce possibilities to reduce the liner wall thickness or increase specific output. The preliminary evaluation in this paper showed that this new material is feasible for HDD diesel engines with a PCP up to 250 bar. In cases where the customer needs to increase the bore diameter for output reasons there is the potential to reduce the liner wall thickness by up to 25% based on high mechanical properties (UTS, Young’s modulus and fatigue strength). In both cases, a FEA analysis to support the new component design is recommended.

scholarly journals Differentiated welding deposit of soiling parts according to abrasive wear map

2021 ◽  
Vol 291 ◽  
pp. 02030
Author(s):  
Viktor Myalenko ◽  
Olga Sankina
Keyword(s):  
Heat Treatment ◽  
Cast Iron ◽  
Abrasive Wear ◽  
Friction Surface ◽  
Gray Cast Iron ◽  
Physical And Mechanical Properties ◽  
Hardened Layer ◽  
Wear Intensity ◽  
Gray Cast ◽  
Soil Cutting

The paper proposes the use of maps of the expected abrasive wear of the friction surface of a soil-cutting part, which characterize the wear intensity at various points of the friction surface during its movement in the soil environment. The importance of this work is caused by changes in modern technologies for the cultivation of agricultural crops, requiring changes in the geometric shapes of soil-cutting parts with the need to predict their service life. A study of the physical and mechanical properties and structure of the hardened layer was carried out using gray cast iron. Gray cast iron was preliminarily subjected to heat treatment, which made it possible to increase the tensile strength up to 200 … 250 MPa and hardness up to HRC 50 … 55. To increase the wear resistance of soil-cutting parts operating in an abrasive environment, hardening was carried out by the electric spark method using gray cast iron, previously subjected to heat treatment. The microstructure of the deposited layer became pearlite-ledeburite without graphite precipitation. Electro-spark deposition made it possible to form a wear-resistant layer in several passes, while the structure of the cast iron and the base did not undergo any changes. No increase in grain size was observed in the deposited layer, which favorably affects its properties. The hardness of the deposited layer was higher (4800 … 5000 MPa) than that of the base metal (2300 … 2400 MPa), no softening of the base was observed. According to the test results of hardened products, heat-treated gray cast iron can be recommended for use as a material for hardening, since the thickness of the coating does not lead to changes in the initial geometric dimensions of the soil-cutting tool using differentiated surfacing using abrasive wear maps.

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