Subscribe to the gold package and get unlimited access to Shamra Academy
Register a new userAluminizing of Carbon Steel
ألمنة الفولاذ الكربوني
1423
2 36
0
(
0
)
Authors
عبد الله يوسف مجيد( باحث )
Created by
Shamra Editor
Ask ChatGPT about the research
يقدم البحث دراسة آلية انتشار الألمنيوم و البنية المجهرية و التركيب الطوري و الخواص المختلفة لطبقة الطلاء الانتشاري بالألمنيوم (الألمنة) في الفولاذ الكربوني. أظهرت نتائج دراسة المعالجة الانتشارية بالألمنيوم في وسط إشباعي مسحوقي، أنه يؤدي إلى تشكيل طبقة طلاء انتشاري الصلب لعنصر الألمنيوم في الهيكل الشبكي للحديد ناتجة عن تشكل الألمنيوم الذري تحتوي على ألومينيد الحديد و محلول و انتشاره في داخل السطح المعالج. درِس تأثير بارامترات عملية الألمنة في سرعة تشكيل طبقة الطلاء الانتشاري، و خاصة تأثير درجة الحرارة و الزمن، و قد تبين أن زيادة عمق طبقة الألمنة تتعلق بارتفاع درجة الحرارة و زيادة الزمن، و لكن تأثير درجة الحرارة يكون أكبر من تأثير الزمن.
This paper provides a mechanism to study aluminum diffusion microstructure, phase structure and different properties of the aluminized layer in carbon steel. The results of aluminized treatment in saturated medium lead to the formation of diffusion layer coating that contains iron aluminide and a- solid solution of aluminum in the unit cell of iron. The effect of aluminizing process parameters on the aluminizing layer, especially the effect of temperature and time, has been shown to increase the depth of the aluminized layer when temperature and time increase, but the effect of temperature is greater than time.
References used
P.I. Melnik," technology of diffusion coating",pp150.–Kiev1978
A.Y.Majeed, "Study of microhardness and resistance wear of boride layers on steel', KKU Journal, N1-vol.1, pp11-25.-SA 2004
A.P. Epik, A.Y. Majeed," Chemical heat treatment of powder based iron", Powder Metallurgy Journal, N8, pp 42-50.- Kiev1993
rate research
Read More
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.
The corrosion behaviour of plain-carbon steels in water environments has been studied. In
this study, a wide range of carbon steels are used in the most common corrosion environments
which are salt water and drinking water. The specimens were immer
sed in the water media and corrosion rates evaluated, using the weight loss method. The effect of
carbon content, corrosion environments and time of immersing on the specimens corrosion
rates of Hypo-eutectoid plain carbon steels have been studied. The aim of this work is to study
the effect of carbon content on the corrosion rate of carbon steels in different corrosion media
and various time intervals. The obtained results showed that there is a clear correlation with
the microstructure where higher Pearlite show higher corrosion rate, so the corrosion rate
increases with the carbon content. The results also show that the corrosion rate of carbon-steel
in salt water is higher than its value in drinking water. It is also found that longer exposure
time, leads to a lower corrosion rate while weight loss is still increasing.
The effects of induction hardening on mechanical properties of two kinds of carbon
steel (0.59%C , 0.35%C) that are widely used in local industry, were discussed by exposed
specimens that were induction hardened with different values of power and i
nductor's
speed to hardness, tensile, and impact tests.
The results of tests showed that the mechanical properties become greater with slight
decrease in impact energy of carbon steel when induction hardening is used, and showed
the possibility to do control on product's properties by make control on treatment
parameters .
This paper aims at studying the influence of gangue aiid researching in the
theoretical empirical methods in order to limit the formation of such gangue
during the manufacture of steel. Gangues are divided to acids, sulfate and
compound gangue. Su
ch gangues are known for their bad influence on the
mechanical characteristics of steel. Experiments have proved that the
influence of Sulfur gangue especially FeS is worse than that of acids, as the
melting point is 880t. Such gangue form capillary ducts within steel, thus
there will be internal micro cleaves and stress points that will lead to
collapse and break when the metal is exposed to stress less than the flowing
point which is considered within the allowed stress values.
The thickness of the diffusion layers was studied, along with the phases and the microstructure and
composition, across the depth in diffusion zone. The obtained results proved the effect of nitriding
system in the growth of the diffusion layers on
surface of double composite martensitic - austenitic alloy
steel.
Analysis of mechanical and tribological characteristics of treated double composite steel under dry
friction was also studied. It was found that diffusion treatment had a significant influence on work
capacity of tested alloy. Stability of alloy after nitriding was (2.5-4) times higher in magnitude
compared to untreated alloy.
فولاذ سبائكي ذو بنية مركبة
تقسية و إرجاع
نتردة غازية
بنية و تركيب طوري
طبقات انتشارية
قساوة سطحية
خواص ميكانيكية و تريبولوجية
Double composite alloy steel
hardening and tempering
gas nitriding
diffusion layers
microstructure and phase composition
surface hardness
mechanical and tribological properties
المزيد..
Log in to be able to interact and post comments
comments
Fetching comments
Sign in to be able to follow your search criteria
