کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7972412 | 1514619 | 2018 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Influence of dynamic strain aging on the mechanical properties and microstructural evolution for Alloy 800H during hot deformation
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
دانش مواد (عمومی)
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Influence of dynamic strain aging on the mechanical properties and microstructural evolution for Alloy 800H during hot deformation Influence of dynamic strain aging on the mechanical properties and microstructural evolution for Alloy 800H during hot deformation](/preview/png/7972412.png)
چکیده انگلیسی
Two types of hot compression tests, namely, constant strain rate and strain rate jump, were carried out for Alloy 800â¯H within a wide temperature range of 450-900â¯Â°C and strain rate range of 0.001-1â¯sâ1. Following the above tests, we studied the effect of dynamic strain aging (DSA) on the mechanical properties and microstructure features to reveal the underlying mechanism responsible for DSA. The results indicated that three kinds of serrated yielding behavior (Type A, B and C) can be observed in the stress-strain curves of the DSA regime. The DSA temperature (TDSA) is located in the temperature range of 500-750â¯Â°C at a strain rate of 0.001â¯sâ1, in 550-790â¯Â°C at 0.01â¯sâ1, and in 600-840â¯Â°C at 0.1â¯sâ1. The activation energy for the appearance of negative strain rate sensitivity was calculated to be 194â¯kJ/mol, and pipe diffusion of substitutional solutes (i.e. Cr, Ni and Ti) is regarded as the mechanism of DSA. TEM observations further elucidated a tendency of linear microstructure within the DSA regime, which also restricts the cross-slip of dislocations and promotes the strain localization along deformation bands.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Science and Engineering: A - Volume 724, 2 May 2018, Pages 37-44
Journal: Materials Science and Engineering: A - Volume 724, 2 May 2018, Pages 37-44
نویسندگان
Yu Cao, Chenghang Zhang, Cheng Zhang, Hongshuang Di, Guangjie Huang, Qing Liu,