Isothermal low-cycle fatigue, fatigue–creep and thermo-mechanical fatigue of SiMo 4.06 cast iron: Damage mechanisms and life prediction

Bartošák, Michal; Horváth, Jakub

doi:10.1016/j.engfracmech.2023.109316

Cited by 9 publications

(1 citation statement)

References 53 publications

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“…SiMo nodular cast iron demonstrates robust mechanical properties up to 500 • C; however, in the temperature range of 500 • C to 750 • C, there is a notable transition from the dominance of elastic strain amplitude to plastic strain amplitude during fatigue cycles [3,5,6]. This phenomenon is also observed in austenitic Ni-Resist (D5S) cast iron, which has slightly higher mechanical properties than SiMo nodular irons above 500 • C, and notably, D5S stands out with its fatigue resistance at temperatures of 700 • C and above [3,6,7]. Another alternative, SiMo1000, shows improved fatigue life over SiMo under different mechanical strain amplitudes in an oxidized environment [6,8].…”

Section: Introductionmentioning

confidence: 91%

High Temperature Oxidation Behavior of High Al-Si Alloyed Vermicular Graphite Cast Iron for Internal Combustion Engine’s Hot-End Exhaust Components

Yilmaz,

Bayata,

Solak

2024

Metals

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This study investigated the influence of high silicon (4.2 wt%) and varying aluminum (3.5–4.8 wt%) content on the high temperature oxidation behavior and thermophysical properties of SiMoAl vermicular graphite cast iron for hot-end exhaust components. Isothermal oxidation tests at 800 °C and nonisothermal oxidation tests in a dry-air atmosphere were conducted on SiMo nodular iron, along with two SiMoAl vermicular graphite cast iron variants alloyed with 3.5 wt% Al and 4.8 wt% Al. The investigations revealed the formation of a thin duplex layer of oxide scale, consisting of an iron-rich external oxide layer and continuous aluminum oxide at the metal/oxide interface. Although aluminum oxide acted as a protective barrier by impeding the solid-state diffusion of oxygen, severe subsurface oxidation was observed due to the interconnected vermicular graphite covered by aluminum oxides after decarburization. Furthermore, based on nonisothermal oxidation experiments, the effective activation energy of oxidation was found to be significantly increased by the addition of aluminum, even though the oxidation activation energies of SiMoAl samples exhibited small changes in comparison to each other. Additionally, thermophysical analysis demonstrated a substantial decrease in the thermal conductivity and a slight increase in the thermal expansion with the addition of aluminum.

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