Role of applied stress on the changes of precipitation and phosphorus segregation behavior in a TP347H austenitic stainless steel

Hong, Chang-Wan; Heo, Yoon-Uk; Kim, Sung-Joon

doi:10.1016/j.matchar.2021.111212

Cited by 6 publications

(1 citation statement)

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“…Phosphorus is widely regarded as one of the most harmful elements in austenite stainless steel. [1][2][3][4][5] It is well known that P is a trace element, and it has a strong segregation tendency because of its limited solubility in austenite at low temperatures. [6] Therefore, phosphorus tends to segregate in high-energy regions (such as grain boundaries, phase interfaces, and surfaces) to reduce the total Gibbs free energy of the system.…”

Section: Introductionmentioning

confidence: 99%

Effects of Electric Current Pulse Treatment on Phosphide Precipitation Behavior in 304 Stainless Steel

Jia

Zhong

et al. 2023

steel research int.

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The precipitation behavior of phosphides in melting and solidification of 304 stainless steel under treatment using an electric current pulse (ECP) is studied. The composition and crystal structure of phosphides are confirmed and analyzed via scanning electron microscope and transmission electron microscope (TEM). The results show that the phosphides are composed of Cr, Mn, S, and P in the sample that is quenched at 1773 K without ECP treatment. From the high-resolution TEM images and selected area electron diffraction, the crystal lattice structure of phosphides is the same as that of Cr 3 P. Mn and S replace some of the Cr and P in the Cr 3 P lattice because of the replacement solution. Phosphides are hardly detected in the samples that are treated using ECP. ECP treatment inhibits the formation of Cr 3 P. Phosphide is mainly presented in the form of CrP 4 in the samples that are quenched at 1583 K, which contain a large number of nanoaustenite grains. Meanwhile, ECP treatment inhibits the growth of phosphides because of differences in the conductivity between molten steel and phosphides during solidification. The size of phosphides decreases with an increase in current density.

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Section: Introductionmentioning

confidence: 99%

Effects of Electric Current Pulse Treatment on Phosphide Precipitation Behavior in 304 Stainless Steel

Jia

Zhong

et al. 2023

steel research int.

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Kinetic Model to Investigate the Effect of Cooling Rate on δ-Ferrite Behavior and Its Application in Continuous Casting of AISI 304 Stainless Steel

et al. 2021

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The prediction of M-shaped δ-ferrite content along the thickness direction of continuously cast 304 austenitic stainless steel slab was performed using a diffusion-controlled phase transformation module of Thermo-Calc software. The surface and center of the slab, which solidified with different cooling rates and secondary dendrite arm spacing, were used for kinetic calculations. Comparison between observations and calculations for slab specimens demonstrated that the moving-boundary model could predict retained δ-ferrite content according to various thermal histories. After this validation, the effects of different cooling rates at liquid and solid-state were analyzed to understand the importance of each stage on the diffusioncontrolled δ → phase transformation. Decrease in solid-state cooling rate generally had a larger effect on the reduction of δ-ferrite during cooling when the solidification rate was fast (27.75 °C/s) than when it was slow (0.075 °C/s). This model can be used to predict and control δ-ferrite behavior under different thermal histories during slab casting and welding practices.

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Stress Relaxation Behavior of a Nb-Stabilized Austenitic Stainless Steel at 550 ℃

Zhang,

Shi,

et al. 2023

Acta Metall. Sin. (Engl. Lett.)

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Role of applied stress on the changes of precipitation and phosphorus segregation behavior in a TP347H austenitic stainless steel

Cited by 6 publications

References 50 publications

Effects of Electric Current Pulse Treatment on Phosphide Precipitation Behavior in 304 Stainless Steel

Effects of Electric Current Pulse Treatment on Phosphide Precipitation Behavior in 304 Stainless Steel

Kinetic Model to Investigate the Effect of Cooling Rate on δ-Ferrite Behavior and Its Application in Continuous Casting of AISI 304 Stainless Steel

Stress Relaxation Behavior of a Nb-Stabilized Austenitic Stainless Steel at 550 ℃

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