Effect of non-equilibrium grain-boundary segregation of phosphorus on the intermediate-temperature ductility minimum of an Fe–17Cr alloy

Wang, Kai; Yang, Chun; Si, Hong

doi:10.1016/j.msea.2013.09.008

Cited by 7 publications

(1 citation statement)

References 25 publications

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“…In the austenite-ferrite dual-phase region, the HD may be degenerated by a thin ferrite layer precipitated along the austenite GB since the hot deformation can be concentrated in this thin ferrite area, resulting in failure with a small overall deformation [9,13,14,34]. In the austenite single-phase region, the HD can be deteriorated by the GB sliding or substantially enhanced by the DR [9,12,14,[35][36][37][38]. As the GB strength decreases with the increase of temperature, the GB sliding will become more serious at a higher temperature (i.e., the GB sliding increases with the increase of temperature), thereby reducing the HD of the steel.…”

Section: Discussionmentioning

confidence: 99%

Highly Enhanced Hot Ductility Performance of Advanced SA508-4N RPV Steel by Trace Impurity Phosphorus and Rare Earth Cerium

Guo

Zhao

Song

2020

Metals

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Advanced SA508-4N RPV steel samples, unadded, P-added, and P+Ce-added, are investigated on their hot ductility behavior. Hot tensile tests are carried out in the temperature range of 750 to 1000 °C through a Gleeble 1500D machine. It is demonstrated that the deformation temperatures of all the three steels are located in the austenite single-phase region. There is no ductility trough present for the P+Ce-added steel, but the unadded one exhibits a deep ductility trough. The reduction of area (RA) of the former is always higher than 75% and increases with rising temperature until reaching ~95% at 900 °C or above, whereas the lowest RA value of the latter is only ~50% at 850 °C. Microanalysis indicates that the grain boundary segregation of P and Ce takes place in the tested P+Ce-added steel. This may restrain the boundary sliding so as to improve the hot ductility behavior of the steel. Furthermore, the addition of P and Ce is able to facilitate the occurrence of the dynamic recrystallization (DR) of the steel, lowering the initial temperature of DR from ~900 to ~850 °C and thereby enhancing the hot ductility performance. Consequently, the combined addition of P and Ce can significantly improve the hot ductility of SA508-4N RPV steel, thereby improving its continuous casting performance and hot workability.

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Section: Discussionmentioning

confidence: 99%

Highly Enhanced Hot Ductility Performance of Advanced SA508-4N RPV Steel by Trace Impurity Phosphorus and Rare Earth Cerium

Guo

Zhao

Song

2020

Metals

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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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Modelling equilibrium grain boundary segregation, grain boundary energy and grain boundary segregation transition by the extended Butler equation

Kaptay

2015

J Mater Sci

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Effect of non-equilibrium grain-boundary segregation of phosphorus on the intermediate-temperature ductility minimum of an Fe–17Cr alloy

Cited by 7 publications

References 25 publications

Highly Enhanced Hot Ductility Performance of Advanced SA508-4N RPV Steel by Trace Impurity Phosphorus and Rare Earth Cerium

Highly Enhanced Hot Ductility Performance of Advanced SA508-4N RPV Steel by Trace Impurity Phosphorus and Rare Earth Cerium

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

Modelling equilibrium grain boundary segregation, grain boundary energy and grain boundary segregation transition by the extended Butler equation

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