Experimental characterization of the short crack growth behavior of a ductile cast iron (DCI GJS-500) affected by intergranular embrittlement at temperatures nearby 400 <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline" id="d1e466" altimg="si3.svg"><mml:msup><mml:mrow/><mml:mrow><mml:mo>∘</mml:mo></mml:mrow></mml:msup></mml:math>C

Trelles, Elena Garcia; Eckmann, Stefan; Schweizer, Christoph

doi:10.1016/j.ijfatigue.2021.106573

Cited by 7 publications

(3 citation statements)

References 15 publications

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“…They observed that this brittleness, characterized by a low reduction of area, occurred near temperatures of 810-970 K and found that the brittleness shifted to higher temperatures at higher tensile strain rates. Trelles et al [71] revealed that the material DCI GJS-500 exhibited embrittlement at temperatures nearby 400 • C, leading to a significantly higher fatigue crack growth rate and a reduced lifetime. Zheng et al [72] discovered that the Ni(Bi) alloy exhibited clear intermediate temperature embrittlement with a minimum ductility observed between 700 • C and 750 • C, unlike the high-purity Ni, which did not demonstrate such embrittlement.…”

Section: Role Of Chemical Heterogeneity In Gbs' Deformation Behaviorsmentioning

confidence: 99%

Metastable grain boundaries: the roles of structural and chemical disorders in their energetics, non-equilibrium kinetic evolution, and mechanical behaviors

He,

Wang,

Fan

2024

J. Phys.: Condens. Matter

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Complex environments in advanced manufacturing usually involve ultrafast laser or ion irradiation which leads to rapid heating and cooling and drives grain boundaries (GBs) to non-equilibrium states, featuring distinct energetics and kinetic behaviors compared to conventional equilibrium or near-equilibrium GBs. In this topical review, we provide an overview of both recent experimental and computational studies on metastable GBs, i.e. their energetics, kinetic behaviors, and mechanical properties. In contrast to GBs at thermodynamic equilibrium, the inherent structure energy of metastable GBs exhibits a spectrum instead of single value for a particular misorientation, due to the existence of microstructural and chemical disorder. The potential energy landscape governs the energetic and kinetic behaviors of metastable GBs, including the ageing/rejuvenating mechanism and activation barrier distributions. The unique energetics and structural disorder of metastable GBs lead to unique mechanical properties and tunability of interface-rich nanocrystalline materials. We also discuss that, in addition to structural disorder, chemical complexity in multi-components alloys could also drive the GBs away from their ground states and, subsequently, significantly impact on the GBs-mediated deformation. And under some extreme conditions such as irradiation, structural disorders and chemical complexity may simultaneously present at interfaces, further enriching of metastability of GBs and their physical and mechanical behaviors. Finally, we discuss the machine learning techniques, which have been increasingly employed to predict and understand the complex behaviors of metastable GBs in recent years. We highlight the potential of data-driven approaches to revolutionize the study of disorder systems by efficiently extracting the relationship between structural features and material properties. We hope this topical review paper could shed light and stimulate the development of new GBs engineering strategies that allow more flexibility and tunability for the design of nano-structured materials.

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Section: Role Of Chemical Heterogeneity In Gbs' Deformation Behaviorsmentioning

confidence: 99%

Metastable grain boundaries: the roles of structural and chemical disorders in their energetics, non-equilibrium kinetic evolution, and mechanical behaviors

He,

Wang,

Fan

2024

J. Phys.: Condens. Matter

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“…Ductile cast iron with spherical graphite has good performance and durability at high temperatures, it has good mechanical properties, it is easy to cast and it is inexpensive. These properties have made its field of application widespread [1]. There are many competitive applications for ductile cast iron compared to steel [2].…”

Section: Introductionmentioning

confidence: 99%

Mechanical Properties and Fracture Toughness Prediction of Ductile Cast Iron under Thermomechanical Treatment

Abdellah,

Alharthi,

Alfattani

et al. 2024

Metals

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Temperature has a great influence on the mechanical properties of ductile cast iron or nodular cast iron. A thermomechanical treatment was carried out at various elevated temperatures of 450 °C, 750 °C and 850 °C using a universal testing machine with a tub furnace. Specimens were held at these temperatures for 20 min to ensure a homogeneous temperature distribution along the entire length of the specimen, before a tensile load was applied. Specimens were deformed to various levels of uniform strain (0%, 25%, 50%, 75%, and 100%). These degrees of deformation were measured with a dial gauge attached to a movable cross plate. Three strain rates were used for each specimen and temperature: 1.8×10−4 s−1, 9×10−4 s−1 and 4.5×10−3 s−1. A simple analytical model was extracted based on the CT tensile test geometry and yield stress and a 0.2% offset strain to measure the fracture toughness (JIC). To validate the analytical model, an extended finite element method (XFEM) was implemented for specimens tested at different temperatures, with a strain rate of 1.8×10−4 s−1. The model was then extended to include the tested specimens at other strain rates. The results show that increasing strain rates and temperature, especially at 850 °C, increased the ductility of the cast iron and thus its formability. The largest percentage strains were 1 and 1.5 at a temperature of 750 °C and a strain rate of 1.8×10−4 s−1 and 9×10−4 s−1, respectively, and reached their maximum value of 1.7 and 2.2% at 850 °C and a strain rate of 9×10−4 s−1 and 4.5×10−3 s−1, respectively. In addition, the simple and fast analytical model is useful in selecting materials for determining the fracture toughness (JIC) at various elevated temperatures and different strain rates.

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“…This feature has been designated by different authors as elevated temperature brittleness [7]- [9], 673K embrittlement [10], [11], brittleness at medium temperature [12], and intergranular embrittlement [12], [13]. Different mechanisms have been proposed for the MTB phenomenon.…”

mentioning

confidence: 99%

TEM Study on the Middle Temperature Brittleness of HiSiMo Cast Irons at 400˚C

Zhu

Godlewski

Lekakh

et al. 2022

Microscopy and Microanalysis

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Experimental characterization of the short crack growth behavior of a ductile cast iron (DCI GJS-500) affected by intergranular embrittlement at temperatures nearby 400 ∘C

Cited by 7 publications

References 15 publications

Metastable grain boundaries: the roles of structural and chemical disorders in their energetics, non-equilibrium kinetic evolution, and mechanical behaviors

Metastable grain boundaries: the roles of structural and chemical disorders in their energetics, non-equilibrium kinetic evolution, and mechanical behaviors

Mechanical Properties and Fracture Toughness Prediction of Ductile Cast Iron under Thermomechanical Treatment

TEM Study on the Middle Temperature Brittleness of HiSiMo Cast Irons at 400˚C

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