Derin Kriyojenik İşlemin Farklı Bekletme Sürelerinin AISI 4140 (42CrMo4) Çeliğin Mekanik Özelliklerine Etkisi

Yıl 2018, Cilt:6 Sayı:3 (2018) (Özel Sayı: UMAS 2017), 553 - 564, 10.04.2018

Menderes Kam Hamit Saruhan

Öz

Bu çalışmada, özellikle otomotiv endüstrisinde yaygın olarak
kullanılan AISI 4140 (42CrMo4) çeliğinin mekanik özellikleri üzerinde farklı
bekletme süreli derin kriyojenik işlemin etkisi incelenmiştir. Bu amaçla
hazırlanan AISI 4140 çeliğinden imal edilen numunelere geleneksel ısıl işlem
uygulanmış ve geleneksel ısıl işlemi tamamlayıcı bir işlem olan derin
kriyojenik işlem farklı bekletme sürelerinde (12, 24, 36 ve 48 saat)  - 140 °C sıcaklıkta uygulanmıştır. Derin
kriyojenik işlem sonrasında numunelere 200 °C’ de temperleme işlemi
uygulanmıştır. AISI 4140 çeliğin mekanik özelliklerinin belirlenebilmesi için
sertlik ölçüm ve çekme testleri gerçekleştirilmiştir. Bu testlerden elde edilen
bulgular analiz edilmiş ve karşılaştırılmıştır. Sonuçlar, farklı bekletme
süreli derin kriyojenik işlemin ve derin kriyojenik işlem sonrası uygulanan
temperleme işleminin AISI 4140 çeliğin mekanik özellikleri üzerinde önemli
etkileri olduğunu göstermiştir. Derin kriyojenik işlemli numunelerde önemli
sertlik artışları ve çekme dayanımlarında kayda değer iyileşmeler olmuştur.
Ayrıca, mekanik özelliklere etkisi yönünden derin kriyojenik işlemin en uygun
bekletme süresinin 36 saat olduğu tespit edilmiştir.

Anahtar Kelimeler

AISI 4140, Derin kriyojenik işlem, Mekanik özellikler, Sertlik

The Effect of Deep Cryogenic Treatment with Different Holding Times on the Mechanical Properties of AISI 4140 (42CrMo4) Steel

Öz

In this study, the effect of Deep Cryogenic Treatment with different holding times on the mechanical properties of AISI 4140 steel was investigated. For this purpose; AISI 4140 steel samples were subjected to quenched treatment, deep cryogenic treatment and deep cryogenic treatment - tempering. The samples were cooled down from room temperature to -140 °C and holded for different holding times (12, 24, 36 and 48 hours) for the deep cryogenic treatment. The tensile and hardness tests were performed to investigate the effect on the mechanical properties of the AISI 4140 steel. The results showed that different holding times of Deep Cryogenic Treatment have significant effect on the mechanical properties of AISI 4140 steel. Deep Cryogenic Treatment was shown to have a positive effect on the hardness. It was also found that the optimum holding time of the deep cryogenic treatment was 36 hours. The results showed that tensile strength was found to improve about 10 % and hardness value about 5 %.

Anahtar Kelimeler

AISI 4140, Deep cryogenic treatment, Mechanical properties, Hardness

Kaynakça

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