Finite element prediction of crack formation induced by quenching in a forged valve

Gallina, Davide

doi:10.1016/j.engfailanal.2011.07.020

Cited by 24 publications

(8 citation statements)

References 7 publications

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“…Sugianto et al , for example worked on eccentric holed disks of carbon steel AISI 1045 quenched into water and polymer solution, studying the susceptibility to quench‐cracking by comparing the residual stress, predicted through Finite Element (FE) simulations, against the yield strength during the quenching process. Gallina by means of the extended finite element method (XFEM) simulated a quenching induced crack in a forged valve, showing good agreement between experimental and numerical results. He adopted the maximum principal stress as failure criterion and considered the ultimate tensile strength of the microstructures mixtures in time (during quenching) as failure initiation condition.…”

Section: Introductionmentioning

confidence: 81%

Numerical and experimental investigation of the mesoscale fracture behaviour of quenched steels

Schicchi

Hoffmann

Hunkel

et al. 2016

Fatigue Fract Eng Mat Struct

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During heat treatment processes, especially during quenching, cracks may form because of the presence of high thermal and mechanical stresses and strains. Notwithstanding the fact that increasingly detailed modelling for heat treatment is being performed (considering, i.a., grain size, creep and transformation plasticity), homogeneous microstructures are still normally assumed. Chemical and hence structural inhomogeneities are not commonly explicitly considered, which is especially accentuated in the case of real parts simulation because of the resulting numerical problem's size. Intensive quenching on a cylindrical specimen of 100Cr6 (SAE) steel is proposed here to experimentally investigate the microcrack generation. A finite element based model is proposed to numerically evaluate the fracture behaviour in a two‐step simulation. First, by solving the quenching problem in direct correspondance with the experimental test performed, and second, by studying the mesoscale response taking into account the influence of second phase particles in a representative volume element based approach. The maximum principal stress criterion is used to trigger the fracture by means of the extended finite element method at the mesoscale. The trend to form cracks in the surface region, experimentally observed, has been well captured by the model. The influence of carbides sizes and content on the mesoscale fracture response has been numerically analysed as well. A good agreement has been reached between the simulations and the experimental results, exhibiting the potential of the introduced approach to be used as a failure prediction methodology.

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Section: Introductionmentioning

confidence: 81%

Numerical and experimental investigation of the mesoscale fracture behaviour of quenched steels

Schicchi

Hoffmann

Hunkel

et al. 2016

Fatigue Fract Eng Mat Struct

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Section: Xfem Methodsmentioning

confidence: 99%

“…Crack propagation consists of two steps: crack initiation and crack propagation. The maximum principle stress law (Maxps) has been used as a damage initiation criterion, which can be defined by the following 23 where is the maximum allowable principal stress (MAXPS) and is maximum tensile stress in the model. In this work, was chosen to be equal to the yield stress of the matrix material.…”

Section: Model Descriptionmentioning

confidence: 99%

Finite element analysis of failure mechanisms in HDPE/CaCo₃particulate composite

Arbabi

Anbardan

Hassanifard

2014

Plastics, Rubber and Composites

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A finite element analysis of crack propagation in an HDPE/CaCo3 composite was carried out using a combination of the extended finite element method (XFEM) and the cohesive zone method (CZM). A unit cell of an entire composite consisting of one particle was chosen as the study zone. The interphase was assumed as a cohesive surface between the matrix and the particle. Variable parameters were the interface adhesion, position of initial crack, volume fraction, and size of the particle. The results showed that, the energy release rate increases when increasing the particle size. Increasing the volume fraction from 5 to 10% has positive effects in decreasing the strain energy release rate; however, the effects of 10 and 15% of volume fraction on the energy release rate are almost the same. Increasing the values of interfacial adhesion strength increases the strength of composite.

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“…Above 600 • C, further softening of the material occurs due to the coalescence of carbides and reduction in the dislocation density [20]. For high-temperature metal forming operations, such as die casting for the injection of light alloys (aluminum alloys), forging dies, etc., in particular, steels containing 5% Cr (e.g., AISI H11) have been developed [9,[21][22][23][24][25][26]. These steels are used to produce molds for fixed and movable core parts and for thermoforming tools, such as small-and medium-sized dies and die inserts, mandrels, jaws, and punches, in particular those with a high strength (>1800 MPa).…”

Section: Introductionmentioning

confidence: 99%

Selected Properties of Hardfacing Layers Created by PTA Technology

Brezinová

Viňáš

Guzanová

et al. 2021

Metals

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The paper presents research results on the quality of hardfacing layers made during the renovation of unheated mold surfaces designed for injection of aluminum alloys using the plasma transferred arc (PTA) technology. As mold material, the medium alloy steel X38CrMoV5-1 (H11) was used. For the formation of functional layers, three types of additives in the form of powder were applied: two types on an iron basis with the designation HSS 23 and HSS 30 and one type on a nickel basis with the designation DEW Nibasit 625-P. The hardfacing layers were made on a 120 × 350 × 50 mm plate in two layers on the plasma hardfacing machine PPC 250 R6. The quality of the layers was evaluated by means of nondestructive and destructive tests. The surface integrity of the layers was assessed using visual and capillary tests. The samples passed these tests. The impact of the parameters used and the mixing of the hardfacing metal with base material, as well as the structure analysis, were assessed by means of light and electron microscopy (SEM). The chemical composition of the elements was determined by energy-dispersive X-ray spectroscopy (EDX) analysis using a SEM microscope. The hardness of the individual layers was evaluated. Since, during operation, molds are subjected to significant wear due to friction, the friction coefficients for selected temperatures were determined by the equipment for the evaluation of tribology properties. Based on the experiments conducted, all three types of additives can be used for renovation. However, from a tribology perspective, the additive DEW Nibasit 625-P on a nickel alloy basis is recommended for renovation.

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Finite element prediction of crack formation induced by quenching in a forged valve

Cited by 24 publications

References 7 publications

Numerical and experimental investigation of the mesoscale fracture behaviour of quenched steels

Numerical and experimental investigation of the mesoscale fracture behaviour of quenched steels

Finite element analysis of failure mechanisms in HDPE/CaCo₃particulate composite

Selected Properties of Hardfacing Layers Created by PTA Technology

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Finite element prediction of crack formation induced by quenching in a forged valve

Cited by 24 publications

References 7 publications

Numerical and experimental investigation of the mesoscale fracture behaviour of quenched steels

Numerical and experimental investigation of the mesoscale fracture behaviour of quenched steels

Finite element analysis of failure mechanisms in HDPE/CaCo3particulate composite

Selected Properties of Hardfacing Layers Created by PTA Technology

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Product

Resources

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Finite element analysis of failure mechanisms in HDPE/CaCo₃particulate composite