کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5455338 | 1514640 | 2017 | 21 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Mechanical response and dislocation substructure of a cast austenitic steel under low cycle fatigue at elevated temperatures
ترجمه فارسی عنوان
واکنش مکانیکی و زیر ساخت ساختار فولاد آستنیتی در زیر خستگی چرخه کم در دمای بالا
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کلمات کلیدی
ساختار تغییر شکل خستگی چرخه کم، بهبود، سلولهای جابجایی، بازیگران فولاد آستنیتی،
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
دانش مواد (عمومی)
چکیده انگلیسی
With the increase of exhaust temperature in automobiles resulting from the stricter environmental and fuel consumption regulations, high temperature fatigue failure of exhaust manifolds is being a significant issue for safety concern. In this research, low cycle fatigue behavior of a Nb-bearing cast austenitic steel with the "Chinese-script" type primary Nb(C,N), was investigated in the temperature range of 600-950 °C. It is indicated that the fatigue lifetime was predominantly dependent on the inelastic strain amplitude, in spite of fatigue temperature. However, the change of deformation substructure from dislocation cells, slip bands to subgrains was observed from 600 °C to 950 °C, which was induced by the increased thermal recovery. Correspondingly, the cyclic stress amplitude changed from cyclic hardening at 600 °C to cyclic softening and cyclic stress saturation at 800 °C and 950 °C, respectively. Besides, strain heterogeneity was also noted between the dendrite core and the interdendritic region, thus regarded as a promotion for crack initiation. The generated data and the understanding will be helpful for alloy design and fatigue lifetime prediction next.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Science and Engineering: A - Volume 703, 4 August 2017, Pages 422-429
Journal: Materials Science and Engineering: A - Volume 703, 4 August 2017, Pages 422-429
نویسندگان
Hailong Zhao, Carlos C. Jr., Jinyan Tong, Larry A. Godlewski, Jacob W. Zindel, Longfei Li, Mei Li, Qiang Feng,