کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8044261 | 1518917 | 2018 | 9 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Investigation on the thermostability of residual stress and microstructure in shot peened SAF 2507 duplex stainless steel
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
سطوح، پوششها و فیلمها
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چکیده انگلیسی
SAF 2507 duplex stainless steels were treated by shot peening (SP) and then isothermally annealed at elevated temperatures (600-750â¯Â°C). The thermal stability of surface residual stress and microstructure of shot peened material were investigated. Results showed that most of the stress relaxation took place within the initial 30â¯min, and the relaxation behavior could be described by the Zener-Wert-Avrami function. The derived activation energies of stress relaxation for γ and α phase were close to the vacancy-migration-energy in iron. γ phase exhibited higher stress and microstrain relaxation rate than α phase, which was ascribed to the higher stored energy in γ phase. A heavy reduction in dislocations and dislocation cells accompanying with the growth of subgrains was observed in the recrystallized microstructure. The recrystallized grains formed in γ phase were much finer than that in α phase. Moreover, SP accelerated the precipitation kinetics of Ï phase, a mass of Ï phase was precipitated in the deformed layer after isothermal annealing.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Vacuum - Volume 153, July 2018, Pages 145-153
Journal: Vacuum - Volume 153, July 2018, Pages 145-153
نویسندگان
Ming Chen, Huabing Liu, Lianbo Wang, Zhou Xu, Vincent Ji, Chuanhai Jiang,