کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8004250 | 1516580 | 2017 | 9 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Hot deformation behavior of GH4945 superalloy using constitutive equation and processing map
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
فلزات و آلیاژها
پیش نمایش صفحه اول مقاله

چکیده انگلیسی
The hot deformation behavior of GH4945 superalloy was investigated by isothermal compression test in the temperature range of 1000-1200 °C with strain rates of 0.001-10.000 sâ1 to a total strain of 0.7. Dynamic recrystallization is the primary softening mechanism for GH4945 superalloy during hot deformation. The constitutive equation is established, and the calculated apparent activation energy is 458.446 kJ/mol. The processing maps at true strains of 0.2, 0.4 and 0.6 are generally similar, demonstrating that strain has little influence on processing map. The power dissipation efficiency and instability factors are remarkably influenced by deformation temperature and strain rate. The optimal hot working conditions are determined in temperature range of 1082-1131 °C with strain rates of 0.004-0.018 sâ1. Another domain of 1134-1150 °C and 0.018-0.213 sâ1 can also be selected as the optimal hot working conditions. The initial grains are replaced by dynamically recrystallized ones in optimal domains. The unsafe domains locate in the zone with strain rates above 0.274 sâ1, mainly characterized by uneven microstructure. Hot working is not recommended in the unsafe domains.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Iron and Steel Research, International - Volume 24, Issue 6, June 2017, Pages 625-633
Journal: Journal of Iron and Steel Research, International - Volume 24, Issue 6, June 2017, Pages 625-633
نویسندگان
Zhao-xia Shi, Xiao-feng Yan, Chun-hua Duan, Jin-gui Song, Ming-han Zhao, Jue Wang,