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

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 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

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.

Preliminary study for flaw detection in nodular cast iron by cyclic loading and thermography

2013 ◽  
Vol 56 ◽  
pp. 28-37 ◽  
Author(s):  
Wolfgang Tillmann ◽  
Xiaoqun Feng ◽  
Gottfried Fischer ◽  
Jens Nellesen
Keyword(s):  
Cast Iron ◽  
Cyclic Loading ◽  
Flaw Detection ◽  
Nodular Cast Iron ◽  
Preliminary Study

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.

scholarly journals Influence of Aluminum on Fatigue Strength of Solution-Strengthened Nodular Cast Iron

Metals ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 311
Author(s):  
Christian Gebhardt ◽  
Johannes Nellessen ◽  
Andreas Bührig-Polaczek ◽  
Christoph Broeckmann
Keyword(s):  
Cast Iron ◽  
Fatigue Strength ◽  
Aluminum Content ◽  
Nodular Cast Iron ◽  
Fatigue Properties ◽  
Matrix Microstructure ◽  
Graphite Morphology ◽  
Wide Range ◽  
Negative Effect ◽  
High Silicon

The fatigue strength of high silicon-alloyed nodular cast iron is influenced by casting defects and graphite precipitates. The literature as well as the findings of this work show that these microstructural constituents can be tailored by controlling silicon microsegregation. In addition, segregations also affect the ferritic matrix microstructure locally. In the present work, silicon segregations in high silicon-alloyed ductile iron are specifically manipulated by small additions of aluminum. It was demonstrated how the aluminum content affects a wide range of microstructural constituents across a variety of length scales. Specimens from alloys with small additions of aluminum were fabricated and tested by rotating bending. Results show that the fatigue strength can be increased compared to a reference alloy with no aluminum. Microstructure analysis as well as fractography were performed concluding that microstructural changes could be attributed to the increased aluminum content, which allows the fatigue properties to be tailored deliberately. However, according to the results of this study, the negative effect of aluminum on castability and graphite morphology limits the maximum content to approximately 0.2 wt.%.

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.

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