Precipitate formations with self-adaptive elemental diffusion and segregation in T92 steel

Wang, Shuangbao; Liu, J.Z.; Qi, Quan You; Chang, Xiaofeng; Gao, Song; Zhang, Weihua; Wang, P.

doi:10.1016/j.jallcom.2016.09.190

Cited by 10 publications

(3 citation statements)

References 40 publications

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“…The spherical NbN particles are the main precipitates in the conventional hot rolled strip, while in the as-cast strip, the Nb-bearing precipitate shows a short rod shape and contains certain S element. Wang et al [23] calculated the formation enthalpy of NbS with face-centered cubic structures by the first-principles method and reported that the formation enthalpy of NbS is slightly less than that of NbC and NbN. This result indicates that the NbS may be formed in steel from a thermodynamic point of view.…”

Section: The Conventional Hot Rolled Strip and Twin-roll As-cast Stripmentioning

confidence: 99%

Comparison of Precipitates and Texture Evolution in Nb-Bearing Grain-Oriented Silicon Steel Produced by Conventional Processing and Novel Twin-Roll Casting

Wang

Zhang

Fang

et al. 2020

Metals

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The Nb-bearing grain-oriented silicon steel sheets were produced by conventional route and novel twin-roll casting route, respectively. The microstructure, texture and precipitate evolution were comparatively investigated by using electron backscattered diffraction (EBSD) and transmission electron microscope (TEM). The findings revealed that the precipitation behavior and the texture evolution were totally different between the two processing routes. In the conventional route, a great number of nanoscale niobium nitride particles (NbN), which acted as mainly grain growth inhibitors were precipitated during hot rolling, while in the twin-roll casting route, due to the rapid solidification, the precipitation of NbN were suppressed and a new type Nb-bearing precipitate enriched with sulfur element was observed in the as-cast strip. Besides, the primary recrystallized texture of conventional specimens was characterized by strong γ-fiber with a peak at {111} <110>, together with very few Goss components. While in the case of twin-roll casting specimens, the strongest primary recrystallized texture was {111} <112> texture and the area fraction of Goss component was much higher than that of conventional specimens. After final high temperature annealing, complete secondary recrystallization was obtained in twin-roll casting specimens and the magnetic induction of B8 was 0.1 T higher than that of conventional specimens.

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Section: The Conventional Hot Rolled Strip and Twin-roll As-cast Stripmentioning

confidence: 99%

Comparison of Precipitates and Texture Evolution in Nb-Bearing Grain-Oriented Silicon Steel Produced by Conventional Processing and Novel Twin-Roll Casting

Wang

Zhang

Fang

et al. 2020

Metals

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“…The main aim of Y 2 O 3 addition is to improve the dispersion strengthening effect and irradiation resistance of the ODS steel. Besides the formation of Y-Ti-O nanoparticles, Ti can also act as a stabilizer that prevents the formation of Cr carbides via the generation of TiC [40,41]. Since Ti atoms have higher affinity with C than Cr, TiC precipitates are preferentially formed, which effectively prevents the Cr depletion.…”

Section: Spsed Microstructurementioning

confidence: 99%

Inhibition Effect of Ti on the Formation of Martensite Lath in 14Cr Oxide Dispersion Strengthened Steel

Zhao

et al. 2018

Metals

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Three model powders defined as MP powders (milled pre-alloyed powders), mixed powders (MX, 50 wt.% MP powders + 50 wt.% Oxide-Dispersion Strengthened powders) and Oxide Dispersion Strengthened (ODS) powders (alloyed pre-alloyed powders with the addition of Ti and Y2O3) are obtained under identical ball milling parameters. These powders are then consolidated under same sintering condition by spark plasma sintering (SPS) in order to investigate the formation mechanism of martensite lath in the MP steel and the effect of Ti on the stability of ferrite. The results indicate that the addition of Y2O3 and Ti powders can act as friction material during the mechanical alloying process, thus promoting the refinement effect. The formation of martensite lath in the MP steel is attributed to the local Cr depletion resulted from the large amounts of M23C6 precipitation. Ti possesses a strong affinity to C and long range diffusion ability, which efficiently prevents the martensite lath formation and local Cr depletion. Present study supports the conclusion that the lack of martensite in the MX and ODS steel is due to the addition of Ti. Secondary phases in these steels are identified and analyzed as well.

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“…The degradation process starts typically with the formation of precipitates and creep micropores (voids), continues with the production of microcracks and ends with the materials destruction. An important basis for the description and explanation of the degradation processes running in these steels is their microstructure examination in certain periods of the operation time [9][10][11][12][13][14][15]. For this reason, numerous analytical methods are used that include X-ray diffraction (XRD) analysis [2], optical microscopy (OM) [16,17], scanning electron microscopy (SEM) [16,17], atomic force microscopy (AFM) [4,18,19] and transmission electron microscopy (TEM) [12,20].…”

Section: Introductionmentioning

confidence: 99%

Microstructure changes responsible for the degradation of the 10CrMo9-10 and 13CrMo4-5 steels during long-term operation

Gwoździk

Motylenko

Rafaja

2019

Mater. Res. Express

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The paper presents results of microstructure and mechanical testing examinations performed using optical and transmission electron microscopy, tensile tests and Charpy tests on 10CrMo9-10 and 13CrMo4-5 steels, before and after they were long-term operated at elevated temperatures in a steam heater. In the 10CrMo9-10 steel, the optical microscopy detected a degradation of original bainite that was accompanied by the formation of ferrite, precipitates and micropores. The transmission electron microscopy revealed that the precipitates are M 23 C 6 and M 7 C 3 type carbides, which are located mainly at the boundaries of former austenite grains, and M 3 C type carbides, which appear inside the grains. The 13CrMo4-5 steel contained a relatively high amount of ferrite in the ferritic-bainitic/perlitic microstructure already in the originally state. The degradation of the microstructure was less serious than for the 10CrMo9-10 steel. The thermal treatment of the 13CrMo4-5 steel led mainly to the precipitation of carbides. The M 23 C 6 and M 7 C 3 type carbides form in perlitic-bainitic areas, while M 3 C and M 6 C type carbides precipitate in ferrite. The higher density of the grain boundary precipitates in the long-term operated 10CrMo9-10 steel facilitated the formation of creep-induced micropores and contributed to the hardness reduction.

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Precipitate formations with self-adaptive elemental diffusion and segregation in T92 steel

Cited by 10 publications

References 40 publications

Comparison of Precipitates and Texture Evolution in Nb-Bearing Grain-Oriented Silicon Steel Produced by Conventional Processing and Novel Twin-Roll Casting

Comparison of Precipitates and Texture Evolution in Nb-Bearing Grain-Oriented Silicon Steel Produced by Conventional Processing and Novel Twin-Roll Casting

Inhibition Effect of Ti on the Formation of Martensite Lath in 14Cr Oxide Dispersion Strengthened Steel

Microstructure changes responsible for the degradation of the 10CrMo9-10 and 13CrMo4-5 steels during long-term operation

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