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NH3 Gas Effect of Gaseous Heat Treatment on some Properties Of Spreading (Diffusion) Surface Layer of Steel 20

تأثير المعالجة الحرارية الغازية بغاز الأمونيا على بعض خصائص طبقة الانتشار السطحية في الفولاذ 20

2005   0   14   0 ( 0 )
 Publication date 2015
  fields Physics
and research's language is العربية
 Created by Shamra Editor




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We have studied in this paper the effect of thermal gaseous using NH3 – gas at some diffusion layers properties of tool steel 20 in temperature range (550 ,650 ,750, 850) 0C , 4h at each one . The purpose of this heat treatment is to get and determine the microhardness, fatigue and corrosion resistance. The micro-hardness was determined using Vickers's tester with values ranged between ( 130-435 ) HV. In order to verify these results, we studied the microstructure if the surface layers using metallurgical microscope and SEM (Scanning Electron Microscope). Furthermore the corrosion resistance was studied after immersing it in sea water for two year.


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Research summary
في هذا البحث، تمت دراسة تأثير المعالجة الحرارية الغازية بغاز الأمونيا (NH3) على بعض خصائص طبقة الانتشار السطحية في الفولاذ 20 عند درجات حرارة مختلفة (550، 650، 750، 850) ولمدة 4 ساعات لكل درجة حرارة. الهدف من هذه المعالجة هو زيادة القساوة المجهرية، المتانة، ومقاومة التآكل. تم قياس القساوة المجهرية باستخدام جهاز Vickers حيث تراوحت القيم بين 130HV و 435HV. للتحقق من هذه النتائج، تم دراسة البنية الدقيقة للطبقة السطحية باستخدام المجهر التعديني والماسح الإلكتروني. كما تم دراسة مقاومة العينات للتآكل بغمرها في مياه البحر لمدة عامين. أظهرت النتائج أن المعالجة الحرارية الغازية بغاز الأمونيا تزيد من القساوة المجهرية ومقاومة التآكل بشكل ملحوظ. تم التوصل إلى أن زيادة درجة الحرارة تزيد من سماكة طبقة الانتشار السطحية وتساهم في تحسين خصائص الفولاذ. النتائج تشير إلى أن المعالجة الحرارية الغازية بغاز الأمونيا تعتبر فعالة في تحسين خصائص الفولاذ 20، مما يجعله أكثر مقاومة للتآكل وأكثر صلابة.
Critical review
دراسة نقدية: يعتبر هذا البحث ذو أهمية كبيرة في مجال تحسين خصائص الفولاذ باستخدام المعالجة الحرارية الغازية بغاز الأمونيا. ومع ذلك، هناك بعض النقاط التي يمكن تحسينها. أولاً، لم يتم التطرق بشكل كافٍ إلى تأثير العناصر الإشابية المختلفة على النتائج، مما قد يؤثر على دقة النتائج المستخلصة. ثانياً، كان من الممكن تضمين دراسات مقارنة مع طرق معالجة حرارية أخرى للحصول على رؤية أشمل. ثالثاً، لم يتم توضيح تأثير العوامل البيئية الأخرى، مثل الرطوبة والملوثات، على مقاومة التآكل بشكل كافٍ. على الرغم من هذه النقاط، فإن البحث يقدم مساهمة قيمة في فهم تأثير المعالجة الحرارية الغازية على خصائص الفولاذ.
Questions related to the research
  1. ما هو الهدف الرئيسي من البحث؟

    الهدف الرئيسي هو دراسة تأثير المعالجة الحرارية الغازية بغاز الأمونيا على خصائص طبقة الانتشار السطحية في الفولاذ 20، بهدف زيادة القساوة المجهرية، المتانة، ومقاومة التآكل.

  2. ما هي درجات الحرارة المستخدمة في المعالجة الحرارية؟

    تم استخدام درجات حرارة 550، 650، 750، و850 درجة مئوية في المعالجة الحرارية.

  3. كيف تم قياس القساوة المجهرية؟

    تم قياس القساوة المجهرية باستخدام جهاز Vickers حيث تراوحت القيم بين 130HV و 435HV.

  4. ما هي النتائج الرئيسية التي تم التوصل إليها؟

    النتائج الرئيسية تشير إلى أن المعالجة الحرارية الغازية بغاز الأمونيا تزيد من القساوة المجهرية ومقاومة التآكل بشكل ملحوظ، وتزيد من سماكة طبقة الانتشار السطحية.


References used
Danial H. Herring ., Principles of Gas Nitriding , part 2 ., by: Danial H. Herring ,- Industrial Heating , vol.78 , 2011., Issus 5 , 53
Goodarzi M.; Marashi S.P.H.; Pouranvari M., Dependence of Overload Performance on Weld Attributes For Resistance Spot Welded Galvanized Low Carbon Steel, Journal of Materials Processing Technology , Moscow. T 209.- № 9. 2009 , 4379- 4384.
Buravlev Yu.M.; Kushnir M.P.; Miloslavski A.G., The Peculiarities of Formation The Upper Layers of Steels After Their Gas Chemical And Physical Treatment, Bulletin of Donetsk National University, Series A. Natural Sciences,- Donetsk,- № 1, 2010 , 107-111
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