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Paslanmaz çelikler özellikle ferritik olanlar, yüksek korozyon direnci, yüksek ve düşük sıcaklık dayanımı, mekanik mukavemet ve uzun süre dayanıklılık sebebiyle ısıya dayanıklı cihazlar, ev aletleri ve inşaat malzemelerinde kullanılmaktadır. Bu çalışmada, AISI 430 ferritik paslanmaz çeliğin malzeme yapısal denklem parametrelerinin (Johnson-Cook-JC), geyç uzunluğu değişimine bağlı olarak belirlenmesi ve istatistiksel olarak doğrulanması amaçlanmıştır. Yedi farklı geyç uzunluğu (0.5, 1, 2, 5, 10, 20, 50 mm) ile çekme numuneleri hazırlandıktan sonra, numuneler aynı deformasyon hızında (2 mm / sn) gerilme testlerine tabi tutulmuştur. Burada, gerinim hızına bağlı olarak akma gerilmesinin değişimi incelenmiştir, çünkü deformasyon hızı sabit tutulmuştur ve geyç uzunluğu değiştirilmiştir. Aynı cihaz üzerinde yarı statik ve dinamik çekme testleri yapılmıştır. Malzemeler ayrıca, yüksek sıcaklıklarda akma gerilmelerinin değişimini gözlemlemek için referans gerinim hızında farklı sıcaklıklarda çekme deneylerine tabi tutulmuştur. Aynı sıcaklıkta, gerinim hızının 0,2’den 0,4 s -1 ’e artırılması ile akma gerilmesi değerinin yaklaşık %5 arttığı tespit edilmiştir. Ayrıca, aynı çekme hızında fırın sıcaklığının 300 °C‘den 600 °C‘ye çıkarılmasıyla akma gerilmesinin %27 azaldığı belirlenmiştir. Bu testler sonucunda malzemenin JC parametreleri belirlenmiştir ve son olarak bu parametreler istatistiksel olarak kanıtlanmıştır.
Stainless steel is used in heat-resistant devices, household tools and construction materials due to high corrosion resistance, high and low temperature resistance, mechanical strength and long durability. This study aims to determine and statistically verify the material structural equation parameters (Johnson-Cook-JC) of the AISI 430 ferritic stainless steel, depending on the variation of the length of the shell. After the preparation of the drawing samples with seven different slurry lengths (0.5, 1, 2, 5, 10, 20, 50 mm), the samples were subjected to drawing tests at the same deformation rate (2 mm / s). Here, the variation of the flow voltage depending on the voltage speed has been studied, as the deformation rate has been kept stable and the length of the curve has been changed. Half-static and dynamic drawing tests were performed on the same device. Materials were also subjected to drawing tests at different temperatures at reference demand speed to observe the change of flow tensions at high temperatures. At the same temperature, it was found that with the rise of the freezing speed from 0.2 to 0.4 s -1 the flow freezing value increased by approximately 5%. Furthermore, it was determined that the flow voltage was reduced by 27% with the elevation of the oven temperature from 300 °C to 600 °C at the same drawing rate. The results of these tests have determined the JC parameters of the material and ultimately these parameters have been statistically proven.
Stainless steels; especially ferritic ones are used in heat resistant devices, home appliances, construction materials due to their high corrosion resistance, high and low temperature availability, mechanical strength and long-time durability. In this study, it was aimed to identify the material constitutive equation parameters (Johnson Cook-JC) of the AISI 430 ferritic stainless steel depending on the gage length variation and to verify the parameters statistically. After preparing tensile samples with seven different gage lengths (0.5, 1, 2, 5, 10, 20, 50 mm), the samples were subjected to tensile tests at the same deformation speed (2 mm/sec). Here, the variation of the yield stress depending on the strain rate was investigated because the deformation speed was kept constant and the gage length was changed. Both quasi-static and dynamic tensile tests were conducted on the same setup. The materials were also subjected to tensile tests at different temperatures on reference strain rate to observe the change of the yield stresses at elevated temperatures. At the same temperature, when the strain rate was increased from 0.2 to 0.4 s-1 , the yield stress was found to increase by about 5%. Furthermore, it was determined that the yield stress decreased by 27% by increasing the furnace temperature from 300 ° C to 600 ° C at the same tensile speed. As a result of these tests, the JC parameters of the material were determined and finally, the validity of these parameters was proved statistically.
Alan : Fen Bilimleri ve Matematik
Dergi Türü : Ulusal
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