کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7832776 | 1503513 | 2018 | 36 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Residual stress and microstructure evolutions of SAF 2507 duplex stainless steel after shot peening
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی تئوریک و عملی
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Residual stress and microstructure evolutions of SAF 2507 duplex stainless steel after shot peening Residual stress and microstructure evolutions of SAF 2507 duplex stainless steel after shot peening](/preview/png/7832776.png)
چکیده انگلیسی
In this study, the SAF 2507 duplex stainless steel was subjected to surface shot peening (SP) treatment. The characteristics of processed samples such as surface morphology, residual stress distribution and microstructure were analyzed by scanning electron microscopy, X-ray diffractometry and transmission electron microscopy techniques. Results showed that SP had deleterious side effect on the surface roughness. After SP, high compressive residual stresses were induced on surface layer of the SAF 2507 alloy. The maximum stresses located at subsurface were approximately â930 and â715â¯MPa in γ and α phase. SP introduced satisfied surface nanocrystallization and microstructure refinement into the material. The minimum grain size located at the top surface was about 25â¯nm, the thickness of nanocrystalline layer with crystallites smaller than 100â¯nm reached to â¼125â¯Î¼m. Moreover, a mass of dislocations and dislocation cells was formed in γ phase, but was rarely observed in α phase. The quantified dislocation density at surface was about 2.29â¯Ãâ¯1015â¯mâ2 and 1.28â¯Ãâ¯1015â¯mâ2 in γ and α phase, respectively. SP leaded to the martensitic transformation, and the transformation sequence was considered to be: γâ¯ââ¯austenite twinsâ¯ââ¯Î±â²-martensite. SP treatments resulted in work hardening and increased the microhardness of the near surface material, which was mainly ascribed to the grain refinement effects and the formation of the strain-induced αâ²-martensite.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Applied Surface Science - Volume 459, 30 November 2018, Pages 155-163
Journal: Applied Surface Science - Volume 459, 30 November 2018, Pages 155-163
نویسندگان
Ming Chen, Huabing Liu, Liaobo Wang, Zhou Xu, Vincent Ji, Chuanhai Jiang,