AISI M2 Takım Çeliğinin Mikroyapısı ve Mekanik Davranışları Üzerine Derin Kriyojenik İşlemin ve Temperlemenin Etkisi

Bu çalışmada, AISI M2 takım çeliğinin farklı ısıl işlemler sonucunda mikroyapı ve tribolojik özelliklerindeki değişimi incelenmiştir. Bu amaçla, su verme + temperleme, s u v erme + d erin kriyojenik işlem + temperleme, su verme + temperleme + derin kriyojenik işlem + temperleme şeklinde üç farklı ısıl işlem prosesi uygulanmıştır. Mikroyapı sonuçlarına göre derin kriyojenik işlem sonrasında mikroyapıdaki karbür tanelerinin boyut ve dağılımlarında iyileşme olduğu belirlenmiştir. Üç farklı ısıl işlem sonrasında elde edilen sertlik değerlerinde ise belirgin farklılıklara rastlanmamıştır. Ayrıca triboloji testleri sonrasında ise kriyojenik işlemli malzemelerin aşınma oranlarında ve sürtünme katsayılarında düşüş gözlenmiştir. Kriyojenik işlemden hemen önce uygulanan temperleme işleminin sürtünme katsayısını düşürücü etkisi olduğu belirlenmiştir.

Effect of Deep Cryogenic Treatment and Tempering on Microstructure and Mechanical Behaviors of AISI M2 Tool Steel

In this study, the change of AISI M2 tool steel in microstructure and tribological properties as a result of different heat treatments were investigated. For this purpose, three different heat treatment processes were applied: quenching + tempering, quenching + deep cryogenic treatment + tempering, quenching + tempering + deep cryogenic treatment + tempering. According to the microstructure results, after deep cryogenic heat treatment, it was determined that the size and distribution of the carbide grains in the structure improved. No significant differences were observed in the hardness values obtained after three different heat treatments. In addition, according to the results of tribology tests, a d ecrease i n w ear r ates a nd f riction c oefficients of cryogenic heat treated materials was observed. It was determined that the tempering process applied just before the cryogenic process reduces the coefficient of friction.

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