Determination and Verification of Material Constitutive Equation Parameters of Ferritic Stainless Steel

Yıl 2019, , 628 - 639, 31.01.2019

Mehmet Erdi Korkmaz

https://doi.org/10.29130/dubited.485087

Cited By: 1

Öz

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.

Anahtar Kelimeler

AISI 430, Gage length, Tensile test, Johnson-Cook

Ferritik Paslanmaz Çeliğin Malzeme Yapısal Denklem Parametrelerinin Belirlenmesi ve Doğrulanması

Öz

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.

Anahtar Kelimeler

AISI 430, Geyç uzunluğu, Çekme testi, Johnson-Cook

Kaynakça

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