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Article
Influence of Machining Parameters on Surface Roughness in Chemical Machining of Stainless Steel 304
تأثير عوامل التشغيل على خشونة السطح في التشغيل الكيميائي

Authors: Saad K. Shather --- Ali Ibrahim
Journal: Engineering and Technology Journal مجلة الهندسة والتكنولوجيا ISSN: 16816900 24120758 Year: 2015 Volume: 33 Issue: 6 Part (A) Engineering Pages: 1377-1388
Publisher: University of Technology الجامعة التكنولوجية

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Abstract

Chemical machining is a well-known nontraditional machining process and is the controlled chemical dissolution of the machined work piece material by contact with a strong acidic or alkaline chemical reagent. It is also called as chemical etching. The present work is aimed at studying the effect of machining time, machining temperature, etching solution concentration on the surface finish of stainless steel 304 using mixed of acids (HCL+HNO3+HF+ H2SO4+H2O). Alloy samples are of (33×33×6) mm dimensions. Three machining temperatures (45, 50 and 55 ºC) for each of which three machining times (3, 6, and 9 min) were used as machining conditions. Surface roughness increases with the machining temperature and machining time. An assessment of CHM was achieved by empirical models for selecting the appropriate machining conditions of the required surface finish. The models were designed based on multiple regression method via Mtb 16 software.

يعد التشغيل الكيميائي احد طرق عمليات التشغيل اللاتقليدية, وهي عملية كيميائية مسيطر عليها لتشغيل قطعة معدنية بواسطة التماس مع حوامض قوية او محاليل كيميائية قلوية, وتسمى ايضا بالحفر الكيميائي. الغرض من هذا البحث هو دراسة تاثير زمن التشغيل , درجة حرارة التشغيل وتركيز المحلول المستخدم على عملية الانهاء السطحي لمعدن مقاوم للصدأ 304 بأستخدام محاليل مختلطة ( HCL+HNO3+HF+ H2so4+H2O) .العينات تمتلك ابعاد (33×33×6) mm مع ثلاث انماط من درجات الحراة(45, 50 and 55) مº عند ازمان تشغيل مختلفة (3, 6, and 9 min) حيث تستخدم كشروط للقطع. بينت الدراسة ان الانهاء السطحي يزداد مع زيادة درجة حرارة التشغيل وزمن التشغيل, وقد تحقق تقييما للعملية من خلال نماذج تجريبية لاختيار شروط التشغيل المثالية للانهاء السطحي المطلوب. النماذج صممت على اساس اسلوب الانحدار المتعدد باستخدام برنامج Mtb 16.


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.

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