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Article
Mechanical Properties of Tempered Nanobainite Steel
الخواص الميكانيكية لصلب النانو بايانايت والمراجع حرارياّ

Authors: Dhafir S. Al-Fattal --- Najmuldeen Y. Mahmood
Journal: Engineering and Technology Journal مجلة الهندسة والتكنولوجيا ISSN: 16816900 24120758 Year: 2013 Volume: 31 Issue: 1 Part (A) Engineering Pages: 107-119
Publisher: University of Technology الجامعة التكنولوجية

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Abstract

The mechanical properties of 62 SiMnCr 4 steel transformed isothermally at 280ºC for 5-hours were investigated. The hardness of nanobainite steel was equivalent to tempered martensite steel. The hardness decreases significantly at high tempering temperatures in excess of 500ºC. Yield strength of about 2GPa and ultimate tensile strength of 2.3GPa have been achieved for nanobainite steel. Furthermore, the high strength is frequently accompanied by relatively good percentage elongation of 8.25%. The strength decreases and the ductility increases with increasing tempering temperature. Nanobainite steel has a high charpy impact energy of 170 J which decreases linearly with increasing tempering temperature. Fatigue strength of nanobainite steel is higher than tempered martensite, its decreases with increasing tempering temperature.

تم دراسة الخواص الميكانيكية للصلب62 SiMnCr 4 المتحول بدرجة حرارية ثابتة هي 280ºCولمدة خمس ساعات الى طور البايانايت الدقيق جداّ (Nanobainite). ان صلادة البايانايت كانت مكافئة لصلادة المارتنسايت المراجع (Tempered martensite). تتناقص صلادة البايانايت بشكل واضح اثناء المراجعة الحرارية في درجات الحرارة التي تتجاوز 500ºC. تم الحصول على مقاومة خضوع ومقاومة شد بحدود (2 GPa) و (2.3 GPa)على التوالي,وإضافة لهذه المقاومة العالية فقد تم الحصول على نسبة استطالة جيدة نسبياّ(8.25%). تتناقص المقاومة وتزداد المطيلية بزيادة درجة حرارة المراجعة. للبايانايت طاقة صدمة عالية بحدود (170 J) وتتناقص خطيا بزيادة درجة حرارة المراجعة. لصلب البايانايت مقاومة كلال اعلى من المارتنسايت المراجع وتتناقص مقاومة الكلال مع زيادة درجة حرارة المراجعة.


Article
Effect of Annealing Treatment on the Anisotropy Behavior of Cold Rolled Stainless Steel 304 Sheets

Authors: Ahmed A. Zainulabdeen احمد عميد زين العابدين --- Jabbar H. Mohmmed --- Najmuldeen Y. Mahmood
Journal: DIYALA JOURNAL OF ENGINEERING SCIENCES مجلة ديالى للعلوم الهندسية ISSN: 19998716/26166909 Year: 2018 Volume: 11 Issue: 2 Pages: 84-89
Publisher: Diyala University جامعة ديالى

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Abstract

Anisotropy of materials has harmful effects during deep drawing operations and reduce it will strongly enhance the productivity and quality of deep drawing yields. In this work the effect of annealing treatment on texture and anisotropy behavior of cold rolled stainless steel 304 sheets were investigated. Uniaxial tensile test samples cut at 0o, 45o and 90o to the rolling direction were prepared in order to measure the anisotropy parameters (normal anisotropy, r_n, and planar anisotropy, ∆r). Two annealing temperatures (1050, and 1150) °C were used to study their effects on anisotropy behavior. The results show that the normal anisotropy value of annealed samples at 1150°C increases by (31%) as compared to the received samples. This indicates that the annealed samples at 1150 °C have the highest formability. Also, results show significant reduction (about 88.7%) in planar anisotropy value for 1150°C annealed samples. This gave rise to an increase in deep drawing yield.


Article
Designing an Integrated Systematic Excavator for Agricultural Land
تصميم منظومة متكاملة تعمل كحفارة (عازقة)ارض زراعية

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Abstract

In this research a complete design of a plough for agricultural land has been achieved. This is atheoretical study, design and invention, for it is considered like the ones available now. Precisely, it is aborne type which can be carried on a vehicle. The optimal design has been reached through making someprimary designs for the research on well excavated land by using spiral digging blades which unearths theearth on both sides. These blades are fixed on a subjacent system raised by a hydraulic tool when thedigging process finishes. This hydraulic tool enables to obtain a digging successive course by controllingthe process of lowering the lower system gradually to perform the digging processby a control system connected to the hydraulic tool.Throughout observation of the previous researches related to plowing [2, 3], it has been found that loadsare put on the most digging blades of the ploughs to increase the digging efficiency and to reach deeperpoints. This has been taken into account in our presented research by designing springs between the lowersystem mentioned above and the upper fixed system.From this we get a downward force which will be observed by detailed drawings. Besides, hinderingdigging blades by solid materials in the earth has been given attention for they penetrate the earth to a depthof (30 cm) by our designing the springs to raise the lower system when hindered and later to reach a systemdesign as a whole

In this research a complete design of a plough for agricultural land has been achieved. This is a theoretical study, design and invention, for it is considered like the ones available now. Precisely, it is a borne type which can be carried on a vehicle. The optimal design has been reached through making some primary designs for the research on well excavated land by using spiral digging blades which unearths the earth on both sides. These blades are fixed on a subjacent system raised by a hydraulic tool when the digging process finishes. This hydraulic tool enables to obtain a digging successive course by controlling the process of lowering the lower system gradually to perform the digging process by a control system connected to the hydraulic tool. Throughout observation of the previous researches related to plowing [2, 3], it has been found that loads are put on the most digging blades of the ploughs to increase the digging efficiency and to reach deeper points. This has been taken into account in our presented research by designing springs between the lower system mentioned above and the upper fixed system. From this we get a downward force which will be observed by detailed drawings. Besides, hindering digging blades by solid materials in the earth has been given attention for they penetrate the earth to a depth of (30 cm) by our designing the springs to raise the lower system when hindered and later to reach a system design as a whole

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