Importance and role of grain size in free surface cracking prediction of heavy forgings

Wang, Zhenhua; Sun, Shuhui; Wang, Bo; Shi, Zhijun; Fu, Weijie

doi:10.1016/j.msea.2014.12.022

Cited by 31 publications

(14 citation statements)

References 27 publications

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“…6a) confirm that oxides are formed and grow through grain boundaries, with different intensities, depending on the crack size and the distance from the surface. The obtained results are in agreement with those reported by other authors [34,35]. The fragilization brought to the material by the formation of these oxides is probably one of the root causes for crack growth in the investigated steel.…”

Section: Discussionsupporting

confidence: 92%

Cracking mechanisms in large size ingots of high nickel content low alloyed steel

Bitterlin

Loucif

Charbonnier

et al. 2016

Engineering Failure Analysis

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This study is focused on determining the possible root causes for cracking after open die forging of large size ingots made of high nickel medium carbon low alloy steels. Optical and scanning electron microscopies as well as Energy Dispersion Spectroscopy (EDS) were used to examine the microstructure of the samples taken out of a cracked forged ingot. The large size of the samples permitted to investigate microstructure at different locations at the surface and in depth. Chemical analysis revealed chromium and oxygen enrichment at the grain boundaries. Grain size measurement indicated clear differences between "clean" surface zones and cracked ones, and between surface and in depth regions. The analyses indicated that fracture phenomena may be due to abnormal grain size which promotes oxide penetration into grain boundaries, resulting in their embrittlement and cracking upon cooling.

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Section: Discussionsupporting

confidence: 92%

Cracking mechanisms in large size ingots of high nickel content low alloyed steel

Bitterlin

Loucif

Charbonnier

et al. 2016

Engineering Failure Analysis

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show abstract

“…These tests consists in the use of specimens with specially designed shapes (axisymmetric or flat) in order to accelerate fracture of the material. The research conducted by many scientists demonstrates that fracture depends not only on grain size, temperature and strain rate [1,[9][10][11], but on the state of stress described by a strain history as well [3,[12][13][14][15]. The main conclusion drawn from the results is that the ductile fracture criterion is well-suited for the modelling of material fracture when the stresses are similar in the test and the investigated process alike.…”

Section: Introductionmentioning

confidence: 96%

Preliminary Analysis of a Rotary Compression Test

Pater¹,

Walczuk²,

Lis³

et al. 2018

Adv. Sci. Technol. Res. J.

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The paper addresses the problem of material fracture in cross rolling processes. A new test based on rotary compression for determining limit values of the damage function after the Cockroft-Latham criterion is proposed. A FEM analysis is performed to determine the stress and strain states in a workpiece subjected to this test. The numerical results demonstrate that the axial region of the workpiece is characterized by the presence of alternating tensile and compressive stresses conducive to fracture. The distribution of the Cockroft-Latham integral in the axial region of the workpiece is determined.

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“…An overview of the literature [3][4][5][6][7][8][9][10] reveals that there is a number of ductile fracture criteria that are based on the function Φ(σ). The most important of these criteria are listed in Table 1, of which the last two (11) and (12) refer to the problem of ductile fracture in the aspect of stress and strain.…”

Section: Introductionmentioning

confidence: 99%

The Problem of Material Fracture Prediction in Cross Rolling Processes

Pater¹,

Tomczak²,

Bulzak³

et al. 2018

Adv. Sci. Technol. Res. J.

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The paper deals with the problem of material fracture prediction in metal forming processes. It was found that the application of well-established solutions for ductile fracture prediction to the modelling of cross rolling processes leads to serious errors. These errors result from the fact that the limit value of the damage function determined via uniaxial tensile and compression tests is too low. Therefore, it is necessary to devise a new test in which the state of stress is similar to that in a cross wedge rolling process characterized by the occurrence of alternating compressive and tensile stresses.

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Importance and role of grain size in free surface cracking prediction of heavy forgings

Cited by 31 publications

References 27 publications

Cracking mechanisms in large size ingots of high nickel content low alloyed steel

Cracking mechanisms in large size ingots of high nickel content low alloyed steel

Preliminary Analysis of a Rotary Compression Test

The Problem of Material Fracture Prediction in Cross Rolling Processes

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