Do you want to publish a course? Click here

Effect of Aging Heat Treatment on Pitting Corrosion Resistance of Martensitic Stainless Steel

تأثير المعالجة الحرارية بالتعتيق في مقاومة التآكل الكيميائي النقري للفولاذ المارتنسيتي المقاوم للصدأ

2115   2   50   0 ( 0 )
 Publication date 2015
and research's language is العربية
 Created by Shamra Editor




Ask ChatGPT about the research

The aim of this work is to study the effect of the aging heat treatment on the pitting corrosion resistance of martensitic stainless steel. In this research a number of specimens from martensitic stainless steel were subjected to solution treatment at 1050 for one hour followed by water quenching then aging in the temperatures range (400-750) for different holding times (1-16 hrs). After heat treatment, two types of corrosion tests (accelerated test and immersion test) were conducted. The results obtained in this research showed that the pitting corrosion resistance was affected by Aging temperature and three critical temperatures were found in corrosion test: the specimens aged at 475 0C had maximum corrosion rate. This may be due to the presence of stringer δ- ferrite and precipitation of very fine precipitates which precipitated heterogeneously in the martensitic matrix, which led to an increase in corrosion rate. The specimens aged at temperatures range (550 – 625) 0C had minimum values of corrosion rate, this is attributed to the high volume fraction of retained austenite. The specimens aged at temperatures above 625 had intermediate corrosion rate. The type of pits, which resulted from two pitting corrosion tests, was independent form the form of δ-ferrite and carbides which presence in microstructure.


Artificial intelligence review:
Research summary
تتناول هذه الورقة البحثية تأثير عملية التبريد والتسخين على خصائص الفولاذ المقاوم للصدأ من نوع AISI 403. يتم التركيز على تأثير درجات الحرارة المختلفة على البنية المجهرية والخصائص الميكانيكية للفولاذ. تم استخدام تقنيات مختلفة مثل XRD وSEM لتحليل البنية المجهرية وتحديد التغيرات في تكوين الكربيدات مثل Cr23C6. كما تم اختبار مقاومة التآكل باستخدام محلول FeCl3. ووجد أن درجة حرارة التبريد والتسخين تؤثر بشكل كبير على تكوين الكربيدات وبالتالي على الخصائص الميكانيكية والمقاومة للتآكل للفولاذ المقاوم للصدأ.
Critical review
دراسة نقدية: تقدم الورقة البحثية تحليلاً شاملاً لتأثير درجات الحرارة على الفولاذ المقاوم للصدأ، ولكن كان من الممكن أن تكون الدراسة أكثر شمولية إذا تم تضمين تأثير عوامل أخرى مثل الضغط والبيئة الكيميائية المختلفة. كما أن استخدام تقنيات تحليل إضافية مثل TEM قد يوفر رؤية أعمق للبنية المجهرية. بالإضافة إلى ذلك، كان من الممكن تحسين العرض البياني للنتائج لتكون أكثر وضوحًا وسهولة في الفهم.
Questions related to the research
  1. ما هو الهدف الرئيسي من الدراسة؟

    الهدف الرئيسي هو دراسة تأثير درجات الحرارة المختلفة على البنية المجهرية والخصائص الميكانيكية للفولاذ المقاوم للصدأ من نوع AISI 403.

  2. ما هي التقنيات المستخدمة لتحليل البنية المجهرية؟

    تم استخدام تقنيات XRD وSEM لتحليل البنية المجهرية وتحديد التغيرات في تكوين الكربيدات.

  3. ما هو تأثير درجة حرارة التبريد والتسخين على الفولاذ؟

    تؤثر درجة حرارة التبريد والتسخين بشكل كبير على تكوين الكربيدات مثل Cr23C6 وبالتالي على الخصائص الميكانيكية والمقاومة للتآكل للفولاذ.

  4. ما هي الاختبارات التي تم استخدامها لتقييم مقاومة التآكل؟

    تم استخدام محلول FeCl3 لاختبار مقاومة التآكل للفولاذ المقاوم للصدأ.


References used
B. Tzaneva, “Effect Of pH ON The Corrosion Behaviour Of High Nitrogen Stanless Steel In Chloride Medium,” Journal of Chemical Technology and Metallurgy, 48, 4, 2013,pp 383- 390
R. C. Newman, “Understanding the Corrosion of Stainless Steel,” Corrosion, Vol. 57, No.12, Dec., 2001, pp1030-1041
. B. Miao, et al., “Microstructure of Tempered AISI 403 Stainless Steel,” Material Science and Engineering, A171, 1993, pp 21-33
rate research

Read More

A new group of Z n - Al alloys suitable for casting was developed in the late sixties, These alloys are ZA - 8 , ZA - 12 and ZA – 27, where the numbers represent the approximate percentage of aluminum in the alloy. These alloys compete with cast iro n and copper alloys and aluminum alloys. ZA – 27 alloy is characterized by the biggest strength and lowest density alloy from the rest of ZA alloys. It has good physical and mechanical properties (good strength, good cast ability, ease of machining, good wear properties and high corrosion resistance). This research is aimed to study the effect of heat treatment on mechanical properties as well as to improve the wear properties of ZA-27alloy. Heat treatment of type T4 was applied on ZA-27 alloy (This treatment was done by heating the alloy to a temperature equal to 370 oC for a period of 3 or 5 hours and then immersion in water followed by natural aging for 30 days). Wear testing has been made by using dry sliding test of pin samples on the disk - ZA – 27 alloy after casting without any treatment and wear tests were performed on heat treated ZA – 27 alloy samples. The microstructure of the alloy after casting and after heat treatment was examined and the effect of the microstructure on the wear behavior was studied. The hardness and tensile strength of heat treated samples were reduced while elongation was increased compared with alloy after casting. The rate of decrease of hardness was equal to 34.7 %, which is consistent with solutionizing period. On the contrary, the increase in the solutionizing period decreases strength and increases elongation. The study shows also that the heat treated samples have achieved a significant improvement on wear properties compared to the samples after casting without heat treatment
This research showed the great importance for following studies of the effect of polluted phosphoric acid, produced in General Fertilizer Company, on the high corrosion resisting alloys, to reach suitable alloys for equipments and machines used for its production, because of its high corrosion rates that create many corrosion problems in these equipments and machines.
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 determ ine 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.
In this work, Ck85 carbon steel was subjected to cyclic heat treatment. Process that consisted of cyclic short-duration (3.4 minutes) holding at 800 C (above Ac3 temperature) followed by forced air cooling. After 8 cycles (about a total 1 hour du ration of heating and cooling cyclic), the microstructure mostly contained fine ferrite grains and spheroidzed cementite. This microstructure possessed an excellent combination of strength and ductility. The disintegration of lamellar pearlite through dissolution of cementite at boundaries lamellar during short-duration holding above Ac3 temperature, and the generation of lamellar defects during nonequilibrium forced air cooling were the main reasons of accelerated spheroidization. The strength initially increased mainly due to the presence of finer microconstituents (ferrite and pearlite) and then marginally decreased with the elimination of lamellar pearlite and appearance of spheroid cementite in the microstructure.
comments
Fetching comments Fetching comments
Sign in to be able to follow your search criteria
mircosoft-partner

هل ترغب بارسال اشعارات عن اخر التحديثات في شمرا-اكاديميا