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Stacking fault energy of cryogenic austenitic steels

Chinese Physics B 2002年第6期11卷 596-600页

作者：戴起勋王安东等 SchoolofMaterialsScienceandEngineering JiangsuUniversityZhangjiang212013China

Stacking fault energy and stacking fault nucleation energy are defined in terms of the physical nature of stacking faults and stacking fault energy, and the measuring basis for stacking fault energy. Large quantities of experimentalresults are processed with the aid of a computer and an expression for calculating stacking fault energy has been obtainedasγSF300 (mJ @ m-2) =γSF0 + 1.59Ni - 1.34Mn + 0.06Mn2-1.75Cr + 0.01Cr2 + 15.21Mo - 5.59Si - 60.69(C + 1.2N)1/2 + 26.27(C + 1.2N)(Cr + Mn + Mo)1/2 + 0.61[Ni @ (Cr + Mn)]1/2.

关键词： austenitic steels stacking fault energy alloying element

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Effects of interstitial cluster mobility on dislocation loops evolution under irradiation of austenitic steel

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Nuclear Science and Techniques 2024年第8期35卷 69-78页

作者： Xin‑Hua Yan Lu Sun Du Zhou Teng Xie Chang Peng Ye‑Xin Yang Li Chen Zhen‑Feng Tong North China Electric Power University Beijing 102206China China Nuclear Power Operations Co. LtdShenzhen 518000China

The evolution of dislocation loops in austenitic steels irradiated with Fe~+is investigated using cluster dynamics(CD)simulations by developing a CD *** CD predictions are compared with experimental results in the *** number density and average diameter of the dislocation loops obtained from the CD simulations are in good agreement with the experimental data obtained from transmission electron microscopy(TEM)observations of Fe~+-irradiated Solution Annealed 304,Cold Worked 316,and HR3 austenitic steels in the *** CD simulation results demonstrate that the diffusion of in-cascade interstitial clusters plays a major role in the dislocation loop density and dislocation loop growth;in particular,for the HR3 austenitic steel,the CD model has verified the effect of temperature on the density and size of the dislocation loops.

关键词： Cluster dynamics Dislocation loops In-cascade interstitial clusters austenitic steels

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EBSD investigation of the crystallographic features of deformation-induced martensite in stainless steel

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Journal of Materials Science & Technology 2021年第10期69卷 148-155页

作者： Jinliang Wang Minghao Huang Jun Hu Chenchong Wang Wei Xu State Key Laboratory of Rolling and Automation Northeastern UniversityShenyang 110819China

Variant selection during the martensitic transformation in steels may play an important role in determining the transformation kinetics and the resulting mechanical *** this study,the variant selection and crystallographic features of deformation-induced martensite were investigated by quasi in situ electron backscatter diffraction(EBSD) in grade SUS321 during tensile *** differences in variant selection between austenite(γ)→hcp-martensite(ε)→bcc-martensite(α’) and γ→α’transformation routes were observed and reported in detail,which demonstrated that s-martensite plays an important role in the variant selection of α’.Variant selection at diffe rent deformation stages was also analysed and revealed that α’ variants with the highest priority and variant pairs were preferred at the initial and last deformation stages in the γ→ε→α’sequence,***,the single α’ variant nucleated at the thin slip band keeps its crystallography feature upon further deformation in the γ→α’*** addition,the strain work of the martensitic transformation for applied loads was quantitatively estimated to explain the variant selection and associated *** these calculations are compared to the experimental results it is found that they are not able to predict which α’ variant is forming pre ferentially during either during the γ→α’ or the ε→α’ sequences,while only accurate predictions are obtained for the γ→ε-transformation which indicates that the γ→α’ variant selection is more complex.

关键词： Deformation-induced martensitic transformation austenitic steels Variant selection Crystallographic orientation

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Hot deformation mechanism and microstructure evolution of an ultra-high nitrogen austenitic steel containing Nb and V

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International Journal of Minerals,Metallurgy and Materials 2015年第10期22卷 1043-1049页

作者： Rong-hua Zhang Ze-an Zhou Ming-wei Guo Jian-jun Qi Shu-hua Sun Wan-tang Fu State Key Laboratory of Metastable Materials Science and Technology Yanshan University College of Metallurgy and Energy Hebei United University

The flow curves of an ultra-high nitrogen austenitic steel containing niobium(Nb) and vanadium(V) were obtained by hot compression deformation at temperatures ranging from 1000°C to 1200°C and strain rates ranging from 0.001 s-1 to 10 s-1. The mechanical behavior during hot deformation was discussed on the basis of flow curves and hot processing maps. The microstructures were analyzed via scanning electron microscopy and electron backscatter diffraction. The relationship between deformation conditions and grain size after dynamic recrystallization was obtained. The results show that the flow stress and peak strain both increase with decreasing temperature and increasing strain rate. The hot deformation activation energy is approximately 631 k J/mol, and a hot deformation equation is proposed.(Nb,V)N precipitates with either round, square, or irregular shapes are observed at the grain boundaries and in the matrix after deformation. According to the discussion, the hot working should be processed in the temperature range of 1050°C to 1150°C and in the strain rate range of 0.01 to 1 s-1.

关键词： austenitic steels hot deformation microstructural

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Modeling the flow curve of hot deformed austenite under industrial rolling conditions

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Baosteel Technical Research 2010年第S1期4卷 30-页

作者： John J JONAS Xavier QUELENNEC McGill University Materials Engineering 3610 University StMontrealQuebecH3A 2B2Canada

A 0.02%C plain carbon steel and a 0.11%C Nb-modified steel were tested in compression in the austenite temperature *** critical strains for the initiation of dynamic recrystallization were determined from the 41 stress-strain curves obtained,using the double differentiation *** work hardening behavior up to the critical strain was analyzed with the aid of a dislocation density model and the work hardening parameters r and h were derived in this *** parameters were used to model the austenite flow curves beyond the critical strain, *** the absence of dynamic *** net softening attributable to dynamic recrystallization was defined as the difference between the calculated work hardening curve and the experimental flow *** softening data are expressed in the form of Avrami *** the dependences of the work hardening parameters and Avrami kinetic parameters on Z,the Zener-Hollomon parameter,it is shown how the flow curves pertaining to industrial rolling conditions can be modeled.

关键词： austenitic steels dynamic recrystallization work hardening parameters Avrami kinetics

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