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Register a new userتأثير متغيرات اللحام على الدخل الحراري و الدورة الحرارية في لحام صفائح من الفولاذ المقاوم للصدأ
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يهدف هذا البحث الى دراسة تأثير متغيرات اللحام على الدخل الحراري و المردود الحراري و على الدورة الحرارية عند لحام صفائح من الفولاذ المقاوم للصدأ. تم في هذا البحث التعرف على مفاهيم الدخل الحراري و الدورة الحرارية و الاطلاع على النماذج التي توصف انتقال الحرارة في أثناء عملية اللحام. تم اجراء دراسة على طرائق تحصيل الدخل الحراري شملت المسعرات المائية (البسيط، و المصعدي التدفقي، و المصعدي المغمور) و قد تبين من نتائج القياس التي تم الحصول عليها أن المسعر المائي المصعدي المغمور هو النسب في قراءة قيمة الدخل الحراري.
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References used
Handbook of Stainless Steel. Outokumpu Oyj, 2013
McGuire, Michael F. Stainless steels for design engineers. Asm International, 2008
O'Brien, Annette. Welding Handbook. Welding Processes: Part 1. Ninth ed., vol. 2, American Welding Society, 2004
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In this research, a study of the influence of arc welding
parameters on the thermal cycle was conducted, where the thermal
cycle within the welded plate of stainless steel 304L by plasma arc
welding (PAW) with weld-on-plate was measured using
the
rmocouples for several welding parameters (intensity of the
welding current, welding velocity, flow rate of plasma gas) and
comparing the influence of this parameters on the thermal cycle
within the plate.
Design of experiments (DOE)
had been used in the study, and the results had been evaluated by the
surface response method. The results showed that the welding
current is the main parameter by its effect on the mechanical studied
properties and the parameters values which give the best responses
had been determined.
يهدف البحث إلى دراسة قابلية اللحام للصلب المقاوم للصدأ المــزدوج نوع (S31803-2205-SAF) ، و مقارنته بسلوك الصلب الاوستينايتي(304 AISI-S30400) عند اللحام أولاً بطريقة لحام القوس الكهربائي لقطب التنكستن باستعمال الغاز الواقي(TIG) اليدوية بتسليط حرارات د
اخلة تتراوح ما بين (110-450) جول/ملم دون استخدام حشوات لحام.
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 a
t 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.
The influence of thermomechanical treatments on the microstructural properties of stainless steel D9 alloy
steel was studied.
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