کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7973237 | 1514625 | 2018 | 25 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Effect of strain rate, soaking time and alloying elements on hot ductility and hot shortness of low alloy steels
ترجمه فارسی عنوان
تأثیر میزان فشار، زمان خیس شدن و عناصر آلیاژی بر گرما و گرما داغ و ضعیف بودن آلیاژهای فولادی کم
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کلمات کلیدی
رطوبت گرم، فراکتوگرافی، کوتاه بودن نرخ فشار، اکسیداسیون،
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
دانش مواد (عمومی)
چکیده انگلیسی
Susceptibility to hot shortness and hot cracking of Cu bearing steels is generally minimized with the addition of Ni. However, in this study, attempts have been made to reduce the hot working problems in such steels by the addition of Si, P and either very low content of Ni or no Ni, which will be understood after evaluating their hot ductility and hot shortness properties. The main techniques employed for this study are hot tensile test, analysis of fractography and characterization of scale/steel interface after long exposure at high temperature. The steels having 0.80-0.86% Si exhibited adequate hot ductility at all deformation temperatures ranging from 850â¯Â°C to 1200â¯Â°C during slow strain rate (0.005â¯sâ1) testing conditions and the fracture morphology exhibited both ductile conical dimples and transgranular fracture. On the other hand, ~0.40% Si containing steels exhibited significantly reduced hot ductility at 850â¯Â°C and failed in intergranular brittle fracture mode. The improved hot ductility of high Si containing steels is explained using Fe-P phase diagram along with the proposition of inverse segregation of Si and repulsive interaction between P and Si. On increasing strain rate to 6.5â¯sâ1, ductile failure was observed in all steels. The long duration of soaking at 1200â¯Â°C lead to intergranular decohesion and hot tearing during tensile testing in ~0.12% and ~0.19% P containing steels, respectively. A separate study of oxidation in air at 1200â¯Â°C indicated that presence of ~ 0.12% P in steel is beneficial in reducing hot shortness by keeping Cu enriched phase away from the scale/steel interface. In contrary to this, oxidation of ~0.19%P containing steel is detrimental to hot working as the grain boundaries of this steel were severely oxidized to the depth of few grains. Other alloying elements such as Ni and Cr in experimental steels had no effect on hot ductility and hot shortness properties.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Science and Engineering: A - Volume 718, 7 March 2018, Pages 292-300
Journal: Materials Science and Engineering: A - Volume 718, 7 March 2018, Pages 292-300
نویسندگان
Gadadhar Sahoo, Balbir Singh, Atul Saxena,