Thermal fatigue of cast iron brake disk materials

Goo, Byeong-Choon; Lim, Choong-Hwan

doi:10.1007/s12206-012-0435-2

Cited by 26 publications

(7 citation statements)

References 10 publications

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“…CGI, as shown in [12], better resists the formation of macroscopic cracks in brake discs made of gray cast iron, from thermal fatigue and thermomechanical loads during braking. This can be explained by the greater cutting effect of the inclusions of lamellar graphite on the metal base to reduce which [13], two improved cast irons with modification of graphite morphology have been proposed.…”

Section: Analysis Of Literature Data and Problem Statementmentioning

confidence: 98%

The Influence of Titanium as a Desferoidizing Element on the Stability of Production of Magnesium Cast Irons with Compacted Graphite

Аулин¹,

Kropivny²,

Kuzyk³

et al. 2021

Tribol. Ind.

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The thermodynamic calculations and the obtained dependence of the Gibbs energy of the reactions of formation of titanium oxide, titanium sulfide, titanium nitride and titanium carbide in the melt of magnesium cast iron on their concentrations and melt temperature have been presented in the article. It has been shown that titanium, regardless of the concentration in melt, will primarily perform a deoxidizing effect, interacting with the oxygen. The lower negative values of the Gibbs energies are characterized by the reactions of the interaction of titanium with sulfur, at a concentration of the latter 0.01%, which indicates a decrease in the probability of such reaction occurrence. From a thermodynamic point of view, the reactions of titanium nitride and carbide formation are less probable. The values of the Gibbs energy of the interaction reaction of titanium depend to a large extent on the melt temperature. It has been found that for a more complete realization of the desulfurizing properties of titanium, it is advisable to enter the composition of cast iron during melting and overheating, when the melt temperature reaches maximum values. The optimal conditions for obtaining magnesium cast irons with compacted graphite has been determined. It has been found that the addition of titanium to magnesium cast iron, as a desferoidizing element containing 0.035% S, has a positive effect on stabilizing the formation of compacted graphite.

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Section: Analysis Of Literature Data and Problem Statementmentioning

confidence: 98%

The Influence of Titanium as a Desferoidizing Element on the Stability of Production of Magnesium Cast Irons with Compacted Graphite

Аулин¹,

Kropivny²,

Kuzyk³

et al. 2021

Tribol. Ind.

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“…In a typical braking mechanism, huge kinetic energy is transformed into frictional heat and the subsequent temperature escalates up to 700 ℃ or even higher, which eventually causes plastic strain on the friction surface of the brake disc [ 2 , 3 ]. Essentially, substantial cyclic loading and subsequent localized thermomechanical phenomena inaugurate crack initiation and propagation and gradually leads to failure of the brake disc material in severe braking [ 4 , 5 , 6 ]. Therefore, it is necessary to study the thermal fatigue properties of potential brake disc material to overcome postulated cracks and corresponding damage mechanisms [ 7 , 8 ].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Thermal Fatigue Life and Crack Morphology in Brake Discs of Low-Alloy Steel for High-Speed Trains

Wang

Chen²,

Zuo³

et al. 2022

Materials

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Effective braking in high-speed trains is one of the major bottlenecks in expediting the technology and possibilities to improve speed. Although substantial progress has been made to increase operating speed, perhaps, thermal fatigue cracking in brake discs is a primary constraint so far. Thermal fatigue cracking is the major cause of brake disc failure in high-speed trains, especially trains with a speed of 350 km/h or above. In this study, new material composition is proposed for brake discs of high-speed trains. A comprehensive investigation is presented based on fatigue crack initiation and propagation, along with wear and micro-hardness characterization. Thermal fatigue tests at various thermal cycles between 20 ℃ and 700 ℃ were performed and the experimental results are compared with fatigue properties of a commercial brake disc material. An experimental trial revealed that thermal cracks normally initiate and propagate along the oxidized grain boundaries; nevertheless, crack propagation is restricted by the fine precipitates and lath structure of martensitic. Moreover, crack length at the initiation and propagation stage is predicted through crack growth rate and favorable grain size in the crack vicinity. Thermal fatigue life can be improved by dictating the microstructure and precipitate morphology of cast steel by tailoring the alloying composition.

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“…Many efforts have been made to identify the causes of thermal fatigue damage to nodular iron brake discs and repair thermal fatigue cracks on brake disc surfaces. Goo et al [7] found that the graphite in ductile iron was the source of thermal fatigue cracks and improved the thermal fatigue resistance by regulating its composition and metallurgical structures. Traditionally, during brake disc repair, cracks are first melted with metals using welding equipment and then refilled with liquid metals through spontaneous flow, which completely welds the cracks together.…”

Section: Introductionmentioning

confidence: 99%

Bionic Repair of Thermal Fatigue Cracks in Ductile Iron by Laser Melting with Different Laser Parameters

Zhou

et al. 2020

Metals

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Nodular iron brake discs typically fail due to serious thermal fatigue cracking, and the presence of graphite complicates the repair of crack defects in ductile iron. This study presents a novel method for remanufacturing ductile iron brake discs based on coupled bionics to repair thermal fatigue cracks discontinuously using bio-inspired crack blocking units fabricated by laser remelting at various laser energy inputs. Then, the ultimate tensile force and thermal fatigue crack resistance of the obtained units were tested. The microhardness, microstructure, and phases of the units were characterized using a digital microhardness meter, optical microscopy, scanning electron microscopy, and X-ray diffraction. It was found that the units without defects positively impacted both the thermal fatigue resistance and tensile strength. The unit fabricated at a laser energy of 165.6 − 15 + 19 J/ mm 2 had sufficient depth to fully close the crack, and exhibited superior anti-cracking and tensile properties. When the unit distance is 3 mm, the sample has excellent thermal fatigue resistance. In addition, the anti-crack mechanism of the units was analysed.

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Thermal fatigue of cast iron brake disk materials

Cited by 26 publications

References 10 publications

The Influence of Titanium as a Desferoidizing Element on the Stability of Production of Magnesium Cast Irons with Compacted Graphite

The Influence of Titanium as a Desferoidizing Element on the Stability of Production of Magnesium Cast Irons with Compacted Graphite

Evaluation of Thermal Fatigue Life and Crack Morphology in Brake Discs of Low-Alloy Steel for High-Speed Trains

Bionic Repair of Thermal Fatigue Cracks in Ductile Iron by Laser Melting with Different Laser Parameters

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