Computational Modeling for Coarsening of (Fe,Cr)&lt;sub&gt;2&lt;/sub&gt;B in Borated Stainless Steel

Won, Chi-Hyoung; Jang, Jae Hoon; Lee, Chang‐Hoon; Lee, Tae‐Ho; Kang, Ning

doi:10.2320/matertrans.m2018336

Cited by 4 publications

(2 citation statements)

References 11 publications

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“…The generation and growth of the precipitation in austenitic steels during heat deformation has had a significant impact on its properties [ 14 ]. The precipitation of borides in BSS is M 2 B [ 15 ], therefore the DRX of the austenitic matrix phase, the behaviors of the boride and the diffusion of boron are critical for the hot deformation of BSS. In the past, the hot deformation behaviors of 304 stainless steel has been studied.…”

Section: Introductionmentioning

confidence: 99%

Study on the Hot Deformation Characterization of Borated Stainless Steel by Hot Isostatic Pressing

Pei

et al. 2021

Materials

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Borated stainless steel (BSS) specimens have a boron content of 1.86 wt%, and are prepared by hot isostatic pressing (HIP) conducted at different temperatures, ranging from 1000 to 1100 °C and a constant true strain rate (0.01, 0.1, 1 and 10 s−1). These tests, with observations and microstructural analysis, have achieved the hot deformation characteristics and mechanisms of BSS. In this research, the activation energy (Q) and Zener–Hollomon parameter (Z) were contrasted against the flow curves: Q = 442.35 kJ/mol. The critical conditions associated with the initiation of dynamic recrystallization (DRX) for BSS were precisely calculated based on the function between the strain hardening rate with the flow stress: at different temperatures from 1000 to 1100 °C: the critical stresses were 146.69–254.77 MPa and the critical strains were 0.022–0.044. The facts show that the boron-containing phase of BSS prevented the onset of DRX, despite the saturated boron in the austenite initiated DRX. The microstructural analysis showed that hot deformation promoted the generation of borides, which differed from the initial microstructure of HIP. The inhomogeneous distribution of elements in the boron-containing phase was caused by hot compression.

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Section: Introductionmentioning

confidence: 99%

Study on the Hot Deformation Characterization of Borated Stainless Steel by Hot Isostatic Pressing

Pei

et al. 2021

Materials

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“…The 18Cr-8Ni austenitic stainless steel containing boron has higher mechanical properties and corrosion resistance [2], so American Society of Testing Materials (ASTM) issued standard A 887 (2004, ASTM International, West Conshohocken, PA, USA), which covers chromium-nickel stainless steel plate, sheet, and strip for nuclear application [3]. Both powder metallurgy (PM) [4][5][6] and casting processes [7][8][9] can produce borated stainless steel (BSS) alloys, but the former has more uniform distribution of boron and higher mechanical properties than the latter.…”

Section: Introductionmentioning

confidence: 99%

Evolution of Microstructure and Elements Distribution of Powder Metallurgy Borated Stainless Steel during Hot Isostatic Pressing

Pei

et al. 2021

Metals

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prepared by powder metallurgy process incorporating atomization and hot isostatic pressing (HIP) sintering at six different temperatures from 600 to 1160 °C, borated stainless steel (BSS) containing boron content of 1.86 wt% was studied. The phase of BSS, relative density of different temperature, microstructure, elemental distribution, and mechanical properties were tested and analyzed. The phases of the alloy were calculated by the Thermo-Calc (2021a, Thermo-Calc Software, Solna, Sweden) and studied by quantitative X-ray diffraction phase analysis. The distributions of boron, chromium, and iron in grains of the alloy were analyzed by scanning electron microscopy and transmission electron microscope. The grain size distributions and average grain sizes were calculated for the boron-containing phases at 900, 1000, 1100, and 1160 °C, as well as the average grain size of the austenite phase at 700 and 1160 °C. After undergoing HIP sintering at 900, 1000, 1100, and 1160 °C, respectively, the tensile strength and ductility of the alloy were tested, and the fracture surfaces were analyzed. It was found that the alloy consisted of two phases (austenite and boron-containing phase) when HIP sintering temperature was higher than 900 °C, and the relative density of the prepared alloys was higher than 99% when HIP temperature was higher than 1000 °C. According to the boron-containing phase grain size distribution and microstructure analysis, the boron-containing phase precipitated both inside the austenite matrix and at the grain boundaries and its growth mechanism was divided into four steps. The tensile strength and elongation of alloy were up to 776 MPa and 19% respectively when the HIP sintering was at 1000 °C.

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Enhancement of the resistance to localized corrosion of type 304 borated stainless steels through hot rolling

Jang

Lee

et al. 2021

Corrosion Science

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Computational Modeling for Coarsening of (Fe,Cr)<sub>2</sub>B in Borated Stainless Steel

Cited by 4 publications

References 11 publications

Study on the Hot Deformation Characterization of Borated Stainless Steel by Hot Isostatic Pressing

Study on the Hot Deformation Characterization of Borated Stainless Steel by Hot Isostatic Pressing

Evolution of Microstructure and Elements Distribution of Powder Metallurgy Borated Stainless Steel during Hot Isostatic Pressing

Enhancement of the resistance to localized corrosion of type 304 borated stainless steels through hot rolling

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