Microstructural evolution of Inconel 625 during hot rolling

Tehovnik, Franc; Burja, Jaka; ..., Bojan Podgornik

doi:10.17222/mit.2015.274

Cited by 13 publications

(12 citation statements)

References 15 publications

(15 reference statements)

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“…A distinctive feature of annealed conventional manufactured face-centered cubic (FCC) materials is the formation of annealing twins [56,57]. Such a microstructural feature was highlighted in this study by light optical microscopy for SLM manufactured IN 625.…”

Section: Discussionmentioning

confidence: 86%

Microstructural and Tensile Properties Anisotropy of Selective Laser Melting Manufactured IN 625

et al. 2020

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The present study was focused on the assessment of microstructural anisotropy of IN 625 manufactured by selective laser melting (SLM) and its influence on the material’s room temperature tensile properties. Microstructural anisotropy was assessed based on computational and experimental investigations. Tensile specimens were manufactured using four building orientations (along Z, X, Y-axis, and tilted at 45° in the XZ plane) and three different scanning strategies (90°, 67°, and 45°). The simulation of microstructure development in specimens built along the Z-axis, applying all three scanning strategies, showed that the as-built microstructure is strongly textured and is influenced by the scanning strategy. The 45° scanning strategy induced the highest microstructural texture from all scanning strategies used. The monotonic tensile test results highlighted that the material exhibits significant anisotropic properties, depending on both the specimen orientation and the scanning strategy. Regardless of the scanning strategy used, the lowest mechanical performances of IN 625, in terms of strength values, were recorded for specimens built in the vertical position, as compared with all the other orientations.

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Section: Discussionmentioning

confidence: 86%

Microstructural and Tensile Properties Anisotropy of Selective Laser Melting Manufactured IN 625

et al. 2020

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“…[16][17][18] As the solubility of oxygen in the matrix is determined by the chemical stability of the oxide, a significant resistance of chemically reported very stable yttrium particles against coarsening. [19][20][21][22] The high-temperature applications of ODS steels are thus rather limited by the existence of grain boundaries allowing diffusional creep and intergranular damage. That is why the creep properties of fine grained ODS steels are usually much worse than those of coarse-grained ones and the existence of grain boundaries and high processing costs seem to be the biggest disadvantages of ODS steels.…”

Section: Introductionmentioning

confidence: 99%

Improving the high-temperature properties of a new generation of Fe-Al-O oxide-precipitation-hardened steels

Khalaj¹,

Jirková²,

Janda³

et al. 2019

Mater. Tehnol.

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Increasing efficiency in power engineering is conditional on the improvement of the high-temperature properties of structural materials. A new Fe-Al-O Oxide-Precipitation-Hardened (OPH) steel was developed by the authors to dissolve the required amount of O in the matrix during mechanical alloying and let a fine dispersion of Al oxides precipitate during the hot consolidation. Compared to oxide-dispersion-strengthened (ODS) ferritic steels, excellent oxidation resistance is guaranteed by using 10 % Al in the matrix. To improve the high-temperature properties of OPH, a series of thermomechanical tests was performed to investigate the recrystallization and grain growth of the microstructures by metallographic analysis. The results show that the heat treatment has a significant influence on the mechanical properties of OPH as well as the microstructure and recrystallization of the grains. It decreased the UTS to almost 25 % of the initial state, while causing plastic deformation. Also, grain growth was observed up to 16 %, even with no annealing and applied deformation, which shows a good structure-oriented material.

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“…and process parameters such as strain, strain rate and the deformation temperature [13][14][15]. The narrow forgeability window of IN625 poses technological challenges for hot working, which affect the final microstructure and hence the mechanical properties [16][17][18]. Typically, variations in temperature (e.g., due to temperature gradient), strain and strain rate due to non-uniform plastic deformation result in microstructural heterogeneity such as variation in grain size and localised carbide precipitation, and even surface cracks.…”

Section: Graphical Abstract Introductionmentioning

confidence: 99%

An innovative constitutive material model for predicting high temperature flow behaviour of inconel 625 alloy

et al. 2022

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Inconel 625 nickel alloy with its attractive high-temperature strength, excellent corrosion and oxidation resistance is mainly used for critical applications in demanding environments, in both as-cast and wrought conditions. Hot processing of this alloy is crucial for achieving its tailored mechanical properties due to the significant variation in microstructural changes with varying process parameters like temperature, strain, and strain rate. In this study, isothermal hot compression tests were carried out at temperatures ranging from 900 to 1100 °C, and under strain rates ranging from 0.01 to 1 s−1. The flow curves revealed three stages of deformation, including a substantial work-hardening stage followed by dynamic recovery and flow softening. Microstructural observations showed the occurrence of discontinuous dynamic recrystallisation (DDRX) as the dominant recrystallisation mechanism during the flow softening. Microstructural analysis suggested that the DRX was more sensitive to the test temperature as compared to the strain rate. An innovative material's constitutive model was developed, by combining Johnson–Cook (JC) and Avrami approaches, to predict work-hardening, dynamic recovery, and flow softening stages of deformation. The predicted flow behavior was in a good agreement with the experimentally measured data. The developed material model was integrated into DEFORM® 3D finite element (FE) simulation software as a user subroutine for the prediction of deformation behaviour in a double truncated cone (DTC) sample. Comparison between the experimentally measured data and the results of FE simulation on the DTC sample showed a very good convergence, indicating the suitability of the proposed material’s constitutive model for large scale simulations. Graphical Abstract

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Microstructural evolution of Inconel 625 during hot rolling

Cited by 13 publications

References 15 publications

Microstructural and Tensile Properties Anisotropy of Selective Laser Melting Manufactured IN 625

Microstructural and Tensile Properties Anisotropy of Selective Laser Melting Manufactured IN 625

Improving the high-temperature properties of a new generation of Fe-Al-O oxide-precipitation-hardened steels

An innovative constitutive material model for predicting high temperature flow behaviour of inconel 625 alloy

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