scholarly journals Fatigue Properties of Nodular Cast Iron at Low Frequency Cyclic Loading

2017 ◽  
Vol 62 (4) ◽  
pp. 2205-2210 ◽  
Author(s):  
A. Vaško
Keyword(s):  
Cast Iron ◽  
Cyclic Loading ◽  
High Frequency ◽  
Stress Ratio ◽  
Low Frequency ◽  
Nodular Cast Iron ◽  
Fatigue Tests ◽  
Fatigue Properties ◽  
Charge Composition ◽  
Cast Irons

Abstract Three melts of ferrite-pearlitic nodular cast iron with different charge composition were used for fatigue tests. Wöhler fatigue curves and fatigue strength were obtained, and microstructure and fracture surfaces were investigated. The aim of the paper is to determine the influence of charge composition on microstructure, mechanical and fatigue properties of synthetic nodular cast irons and their micromechanisms of failure. Fatigue tests were realised at low frequency sinusoidal cyclic push-pull loading (stress ratio R = −1) at ambient temperature (T = 20 ±5°C). They were carried out with using the fatigue experimental machine Zwick/Roell Amsler 150HFP 5100 at frequency f ≈ 120 Hz. The results of fatigue tests at low frequency cyclic loading are compared with fatigue properties at high frequency cyclic loading.

scholarly journals Study of the fatigue behaviour of synthetic nodular cast irons at low and high frequency cyclic loading

2018 ◽  
Vol 157 ◽  
pp. 07014 ◽  
Author(s):  
Alan Vaško ◽  
Juraj Belan ◽  
Eva Tillová
Keyword(s):  
Cyclic Loading ◽  
High Frequency ◽  
Fatigue Testing ◽  
Low Frequency ◽  
Nodular Cast Iron ◽  
Fatigue Behaviour ◽  
Fatigue Tests ◽  
Cast Irons ◽  
Ultrasonic Fatigue ◽  
The Relationship

The paper presents the results of low and high frequency fatigue tests carried out on nodular cast iron. The specimens of synthetic nodular cast irons from three different melts were studied in the high cycle fatigue region (from 105 to 108 cycles) using fatigue experimental equipments for low and high frequency cyclic loading. Low frequency fatigue tests were carried out at frequency f ≈ 120 Hz using the fatigue experimental machine Zwick/Roell Amsler 150HFP 5100. High frequency fatigue tests were carried out at frequency f ≈ 20 kHz using the ultrasonic fatigue testing device KAUP-ZU. Both of them were carried out at sinusoidal cyclic push-pull loading (stress ratio R = -1) at ambient temperature (T ≈ 20 °C). The relationship σa = f (N) and fatigue strengths were determined experimentally; mechanical properties, microstructures and fracture surfaces were investigated.

scholarly journals Fatigue Properties Of Nodular Cast Irons Alloyed By Si, Mo And Cu

2019 ◽  
Vol 1 (1) ◽  
pp. 738-744
Author(s):  
Alan Vaško ◽  
Marek Krynke
Keyword(s):  
Cast Iron ◽  
Low Frequency ◽  
Hardness Test ◽  
Nodular Cast Iron ◽  
Fatigue Behaviour ◽  
Fatigue Tests ◽  
Bending Test ◽  
Fatigue Properties ◽  
Cast Irons ◽  
Number Of Cycles

AbstractIn recent years, the research of nodular cast iron has been focused on increasing fatigue resistence. In the paper, two types of alloyed nodular cast irons have been investigated – SiMo-nodular cast iron alloyed by 4% of silicon and 1% of molybdenum and SiCu-nodular cast iron alloyed by 4% of silicon and 1.5% of copper. SiMo-nodular cast iron is suitable for high-temperature applications, for example the exhaust manifolds of the combustion engines. SiCu-nodular cast iron is used in various components of tribotechnical units. These components are often loaded by fatigue. The mechanical and fatigue behaviour of both nodular cast iron types has been studied by means of tensile test, impact bending test, hardness test and fatigue tests. Fatigue tests were realised at low frequency cyclic push-pull loading up to 10 million cycles. The relationship between the amplitude of stress and number of cycles to failure was investigated and the fatigue strength was determined. Mechanical and fatigue properties of both nodular cast iron types are correlated with the microstructure of specimens.

scholarly journals Comparison of Fatigue Properties of Nodular Cast Iron at Low and High Frequency Cyclic Loading

2017 ◽  
Vol 177 ◽  
pp. 576-581 ◽  
Author(s):  
Alan Vaško ◽  
Milan Vaško ◽  
Juraj Belan ◽  
Eva Tillová
Keyword(s):  
Cast Iron ◽  
Cyclic Loading ◽  
High Frequency ◽  
Nodular Cast Iron ◽  
Fatigue Properties

Influence of Charge Composition on the Structure and Fatigue Properties of Nodular Cast Irons

2014 ◽  
Vol 782 ◽  
pp. 295-300
Author(s):  
Alan Vaško ◽  
Libor Trško ◽  
Mária Chalupová
Keyword(s):  
High Frequency ◽  
Load Ratio ◽  
Fatigue Tests ◽  
Fatigue Properties ◽  
Steel Scrap ◽  
Charge Composition ◽  
Loading Frequency ◽  
Cast Irons ◽  
Metallurgical Silicon ◽  
A Charge

The contribution deals with comparison of microstructure and fatigue properties of synthetic nodular cast irons with a different ratio of steel scrap in a charge. Chemical composition of individual meltages was regulated alternatively by ferrosilicon (FeSi) and carburizer or metallurgical silicon carbide (SiC). The fatigue tests were run at high-frequency sinusoidal cyclic push-pull loading (frequency f 20 kHz, load ratio R = 1, temperature T = 20 ± 5 °C) using the ultrasonic testing equipment KAUP-ZU. The paper shows the influence of charge composition on microstructure, fatigue properties and micromechanisms of failure.

scholarly journals Microstructure and Fatigue Properties of Nodular Cast Iron at Low Frequency Cyclic Loading

2016 ◽  
Vol 16 (5) ◽  
pp. 1188-1193 ◽  
Author(s):  
Alan Vaško ◽  
Juraj Belan ◽  
Lenka Markovičová ◽  
Eva Tillová
Keyword(s):  
Cast Iron ◽  
Cyclic Loading ◽  
Low Frequency ◽  
Nodular Cast Iron ◽  
Fatigue Properties

Correlation between Charge Composition and Fatigue Properties of Nodular Cast Irons

2014 ◽  
Vol 474 ◽  
pp. 291-296 ◽  
Author(s):  
Milan Vaško ◽  
Alan Vaško
Keyword(s):  
Mechanical Properties ◽  
Silicon Carbide ◽  
Cast Iron ◽  
Nodular Cast Iron ◽  
Fatigue Properties ◽  
Steel Scrap ◽  
Charge Composition ◽  
Cast Irons ◽  
Metallurgical Silicon ◽  
A Charge

The contribution deals with comparison of microstructure, mechanical properties and fatigue properties of synthetic nodular cast irons with a different ratio of steel scrap in a charge. Chemical composition of individual meltages was regulated alternatively by ferrosilicon (FeSi) and carburizer or metallurgical silicon carbide (SiC). The paper shows that SiC additive positively influences the microstructure, mechanical properties as well as fatigue properties of nodular cast iron, especially in the meltages with higher ratio of steel scrap in the charge. Moreover, production of synthetic nodular cast irons with SiC additive is economically advantageous.

Fatigue Properties of Synthetic Nodular Cast Irons

2014 ◽  
Vol 635 ◽  
pp. 5-8 ◽  
Author(s):  
Alan Vaško
Keyword(s):  
Mechanical Properties ◽  
Silicon Carbide ◽  
Cast Iron ◽  
Nodular Cast Iron ◽  
Positive Influence ◽  
Fatigue Properties ◽  
Steel Scrap ◽  
Cast Irons ◽  
Metallurgical Silicon ◽  
A Charge

The contribution deals with comparison of microstructure, mechanical properties and fatigue properties of synthetic nodular cast irons with a different ratio of steel scrap in a charge. Chemical composition of individual melts was regulated alternatively by ferrosilicon (FeSi) and carburizer or metallurgical silicon carbide (SiC). The paper shows positive influence of SiC additive on the microstructure, mechanical properties as well as fatigue properties of nodular cast iron. The additive of metallurgical silicon carbide in analysed specimens increases the content of ferrite in the matrix, decreases the size of graphite and increases the average count of graphitic nodules per unit of area. Consequently, the mechanical and fatigue properties of nodular cast iron are improved.

Influence of Stress Mode on Failure Micromechanisms of Nodular Cast Iron

2014 ◽  
Vol 693 ◽  
pp. 382-387 ◽  
Author(s):  
Alan Vaško ◽  
Milan Vaško
Keyword(s):  
Cast Iron ◽  
Nodular Cast Iron ◽  
Mechanical Tests ◽  
Fatigue Tests ◽  
Bending Test ◽  
Metallographic Analysis ◽  
Cast Irons ◽  
Fracture Surfaces ◽  
Static Tensile ◽  
Different Content

The paper deals with comparison of the failure micromechanisms of nodular cast iron at static, impact and fatigue stress. Several specimens of ferrite-pearlitic nodular cast irons with different content of ferrite in a matrix were used for metallographic analysis, mechanical tests and microfractographic analysis. Mechanical properties were found out by static tensile test, impact bending test and fatigue tests. The microfractographic analysis was made with use of scanning electron microscope on fracture surfaces of the specimens fractured by these mechanical tests. Fracture surfaces of analysed specimens are characteristic of mixed mode of fracture. Failure micromechanism of nodular cast irons is dependent on mode of stress.

scholarly journals Corrosion Resistance of SiMo- and SiCu-Types of Nodular Cast Iron in NaCl Solution

2020 ◽  
Vol 2 (1) ◽  
pp. 191-198
Author(s):  
Alan Vaško ◽  
Viera Zatkalíková ◽  
Václav Kaňa
Keyword(s):  
Corrosion Resistance ◽  
Cast Iron ◽  
Sea Water ◽  
Nodular Cast Iron ◽  
Industrial Applications ◽  
Bending Test ◽  
Fatigue Properties ◽  
Nacl Solution ◽  
Cast Irons ◽  
Wide Range

AbstractNodular cast irons are used in a wide range of industrial applications, especially in the automotive industry. SiMo-type of nodular cast iron is suitable for high-temperature applications, for example the exhaust manifolds of the combustion engines; SiCu-type of nodular cast iron is used in various components of tribotechnical units. These automotive components often work in a corrosive environment. Therefore, the aim of this paper is to compare the corrosion resistance of two types of the nodular cast irons (SiMo-type and SiCu-type). Corrosion resistance was determined by the exposure immersion test at ambient temperature. Specimens of both types of nodular cast iron were immersed in 3.5 % NaCl solution (to simulate sea water) and gradually removed from the solution after 1, 2, 4 and 8 weeks. Subsequently, the weight loss (g) and the average corrosion rate (g m−2 day−1) were calculated. Experimental results show that nodular cast iron alloyed by Si and Mo has higher corrosion resistance than the nodular cast iron alloyed with Si and Cu. Moreover, the mechanical properties (evaluated by tensile test, impact bending test and hardness test) and fatigue properties of both types of nodular cast iron has been compared in the paper.

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