Dissolution Behavior of δ-ferrite in Continuously Cast Slabs of SUS304 during Heat Treatment

Fukumoto, Shigeo; Iwasaki, Yuji; Motomura, Hiroshi; Fukuda, Y.

doi:10.2355/isijinternational.52.74

Cited by 12 publications

(5 citation statements)

References 16 publications

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“…To reduce the amount of the delta-ferrite phase in the steels, the steels were heat-treated at 1273 K for 96 h, hot-rolled at 1473 K from 20 mm down to ca. 12 mm in thickness, and finally reheated at 1273 K for 96 h. 20,21 Afterward, the steels were solution-treated at 1323 K for 0.5 h. After heattreatment, the steels were cut into specimens with dimensions of 15 mm × 25 mm × 5 mm. The specimens were ground with a series of SiC papers up to 1500 grit and then polished by a diamond paste down to 1 μm.…”

Section: Methodsmentioning

confidence: 99%

Morphological Characteristics of Trenching around MnS Inclusions in Type 316 Stainless Steel: The Role of Molybdenum in Pitting Corrosion Resistance

Nishimoto

Muto

Sugawara

et al. 2019

J. Electrochem. Soc.

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The role of Mo alloying in the pit initiation process at MnS inclusions in stainless steels was investigated by measuring polarization curves, depassivation pH, and scanning electron microscopy. Molybdenum existed in the steel matrix but was not detected in the MnS inclusions in Type 316 stainless steel. While Mo alloying did not inhibit the dissolution of the MnS inclusions in a NaCl solution, neither a metastable nor a stable pit occurred in the small areas with the MnS inclusions in the Mo-added specimen. The MnS/steel matrix boundary preferentially dissolved in the Mo-free specimen, with deep trenches formed. However, no deep trench was observed in the Mo-added specimen at low potentials. The depassivation pH of the Mo-added specimen in a 0.1 M NaCl-1 mM Na 2 S 2 O 3 solution was lower than that of the Mo-free specimen, suggesting that Mo alloying prevents the depassivation of the steel matrix at the boundary and inhibits the formation of trenches. In a 1 M HCl-1 mM Na 2 S 2 O 3 solution, the active dissolution rate of the steel was suppressed by Mo alloying. This suggests that, even after trenching at high potentials, Mo alloying inhibits the initiation of pitting inside the trenches.

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Section: Methodsmentioning

confidence: 99%

Morphological Characteristics of Trenching around MnS Inclusions in Type 316 Stainless Steel: The Role of Molybdenum in Pitting Corrosion Resistance

Nishimoto

Muto

Sugawara

et al. 2019

J. Electrochem. Soc.

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“…The control of the residual ferrite amount in stainless steel castings is of great importance when aiming at a good product quality. Table 10 shows the calculated (SOL), experimental, [22,31,85,97,[133][134][135][136] and predicted [137] residual ferrite amounts in numerous stainless steels. As shown at the bottom of Table 10, the average deviation between the calculations and the experimental measurements is 1.12 pct and that deviation between the calculations and the predictions [137] is 2.40 pct.…”

Section: Residual Ferrite Amounts Of Stainless Steelsmentioning

confidence: 99%

“…In both calculation algorithms for the SDAS as well as the austenite grain size, Table 10. Calculated (SOL), experimental, [22,31,85,97,[133][134][135][136] and predicted [137] residual ferrite amounts in stainless steels. CRT denotes the cooling rate.…”

Section: Microstructure Datamentioning

confidence: 99%

Simulation of the Solidification and Microstructural Evolution in Steel Casting Processes Using the InterDendritic Solidification Tool

Miettinen

Somani

Visuri

et al. 2022

steel research int.

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InterDendritic Solidification (IDS) is a thermodynamic-kinetic software combined with a microstructure tool developed to simulate the nonequilibrium solidification (non-EQS) of steels. Herein, its main calculation module, solidification (SOL), is introduced, and some essential results of that module, such as the formation of ferrite and austenite in different types of steels during their solidification, and the formation and dissolution of precipitates during subsequent cooling and heating processes, respectively, following solidification, are presented. The non-EQS is compared with equilibrium and poor-kinetics solidification to demonstrate the effect of kinetics on the results using finite solute diffusion and microstructure data. The poor-kinetics solidification is comparable with the modified Scheil simulation ignoring the solid-state diffusion of slowly moving metallic elements. A particular emphasis is made on demonstrating how to use a postprocessing treatment to control the residual ferrite amounts in stainless steels and the extent of precipitation in particular steel. In this context, the phenomena occurring behind the results are discussed. Finally, to validate the simulations of the SOL module, its calculations are compared with numerous solidification measurements, such as the liquidus and solidus temperatures of different steels and the residual ferrite amounts in stainless steels.

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“…It was observed that the DRX would progressively rise as the deformation temperature increased, and an increase in strain rate was identified as result in a significant reduction in both the DRX grain size and DRX fraction. Fukumoto et al [ 19 ] conducted a systematic study on the dissolution behavior of δ ‐ferrite in SUS304 stainless steel during heat treatment. And the results showed that the annealing temperature and secondary dendrite arm spacing influence the dissolution rate.…”

Section: Introductionmentioning

confidence: 99%

Hot Deformation Behavior of 301L Stainless Steel and Dissolution Behavior of δ‐Ferrite During Heat Treatment

Liu

Wang

et al. 2023

steel research int.

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The hot deformation behavior of 301 L stainless steel is investigated at 1000–1250 °C and 0.1–50 s−1. Deformation characteristics are studied through compressive stress–strain curves and constitutive equations. According to the dynamic material model and a series of diffusion annealing experiments, the hot processing map of 301 L stainless steel is established to determine the suitable processing domain. The results show that the stable domain is located in 1085–1240 °C and high strain rate range of 4.5–50 s−1, and the strain rate is the main factor affecting the machinability. Based on the hot compression tests, δ‐ferrite gradually forms a network structure with the increase of temperature; however, it can be inhibited at high strain rate. Therefore, it is necessary to reduce the temperature and increase the strain rate in the actual processing of the machinable area. It is found that diffusion annealing can reduce the content of δ‐ferrite from 12% to 0.67%, and the dissolution of δ‐ferrite is controlled by the diffusion of Cr and Ni, especially noticeable at the interface between γ and δ phase. Finally, the optimum diffusion annealing process parameter is determined at 1300 °C and 10 min.

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Dissolution Behavior of δ-ferrite in Continuously Cast Slabs of SUS304 during Heat Treatment

Cited by 12 publications

References 16 publications

Morphological Characteristics of Trenching around MnS Inclusions in Type 316 Stainless Steel: The Role of Molybdenum in Pitting Corrosion Resistance

Morphological Characteristics of Trenching around MnS Inclusions in Type 316 Stainless Steel: The Role of Molybdenum in Pitting Corrosion Resistance

Simulation of the Solidification and Microstructural Evolution in Steel Casting Processes Using the InterDendritic Solidification Tool

Hot Deformation Behavior of 301L Stainless Steel and Dissolution Behavior of δ‐Ferrite During Heat Treatment

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