کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7970657 | 1514389 | 2014 | 10 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
High-temperature low cycle fatigue behavior of a gray cast iron
ترجمه فارسی عنوان
رفتار خستگی چرخه کم دمای پایین چدن خاکستری
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
دانش مواد (عمومی)
چکیده انگلیسی
The strain controlled low cycle fatigue properties of the studied gray cast iron for engine cylinder blocks were investigated. At the same total strain amplitude, the low cycle fatigue life of the studied material at 523Â K was higher than that at 423Â K. The fatigue behavior of the studied material was characterized as cyclic softening at any given total strain amplitude (0.12%-0.24%), which was attributed to fatigue crack initiation and propagation. Moreover, this material exhibited asymmetric hysteresis loops due to the presence of the graphite lamellas. Transmission electron microscopy analysis suggested that cyclic softening was also caused by the interactions of dislocations at 423Â K, such as cell structure in ferrite, whereas cyclic softening was related to subgrain boundaries and dislocation climbing at 523Â K. Micro-analysis of specimen fracture appearance was conducted in order to obtain the fracture characteristics and crack paths for different strain amplitudes. It showed that the higher the temperature, the rougher the crack face of the examined gray cast iron at the same total strain amplitude. Additionally, the microcracks were readily blunted during growth inside the pearlite matrix at 423Â K, whereas the microcracks could easily pass through pearlite matrix along with deflection at 523Â K. The results of fatigue experiments consistently showed that fatigue damage for the studied material at 423Â K was lower than that at 523Â K under any given total strain amplitude.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Characterization - Volume 98, December 2014, Pages 37-46
Journal: Materials Characterization - Volume 98, December 2014, Pages 37-46
نویسندگان
K.L. Fan, G.Q. He, M. She, X.S. Liu, Q. Lu, Y. Yang, D.D. Tian, Y. Shen,