Investigation and a Statistical Analysis of Abrasive Wear Behaviors of Cryogenically Treated Cold Work Tool Steels

Abstract

In this study, the abrasive wear resistance of the cryotreated DIN 1.2379 cold work tool steel has been investigated. Therefore, untreated and different cryotreated specimens having dimensions of 6x50 mm were prepared. Samples austenised at 1030˚C for 1 hour were quenched in oil. The cryogenic process was applied for 12 hours at -140˚C. The tempering process was carried out at 200˚C for 2 hours. The process applied to the material, the load parameters (10, 20 and 30 N) and the abrasive grid size (800, 1000 and 1200 mesh were determined as the experimental parameters. On the other hand other parameters like sliding speed and sliding distance were kept constant. In order to determine the effect ratios of the parameters on the data obtained from test results, analysis of variance technique was applied. As a result, all three parameters are found to be effective on wear rate, while the most important parameter on wear is applied load. The effect of the load parameter on abrasion was determined as 57.9%, the effect of the abrasive as 19.7% and the effect of the process as 15.6%.

Keywords

• DIN 1. 2379
• cryogenic process
• heat treatment
• analysis of variance
• minitab

Kriyojenik İşlem Yapılmış Soğuk İş Takım Çeliklerinin Abrasif Aşınma Davranışlarının İncelenmesi ve İstatistiksel Analizi

Abstract

Bu çalışmada, kriyojenik işlem uygulanmış olan DIN 1.2379 soğuk iş takım çeliğinin, abrasif aşınma direnci araştırılmıştır. Bu amaçla herhangi bir işlem uygulanmamış ve farklı kriyojenik ısıl işlem uygulanmış 6x50 mm ebatlarındaki deney numuneleri hazırlanmıştır. 1030 ͦ C’de 1 saat östenitlenmiş olan numunelere yağda su verilmiştir. Kriyojenik işlem -140 ͦ C’de 12 saat süre ile uygulanmıştır. Temperleme işlemi, 200 ͦ C sıcaklıkta ve 2 saat süre ile gerçekleştirilmiştir. Deney parametreleri, malzemeye uygulanan işlem, yük (10, 20 ve 30 N) ve aşındırıcı zımpara boyutu (800, 1000 ve 1200 mesh) olarak belirlenmiştir. Diğer taraftan kayma hızı ve kayma mesafesi gibi parametreler sabit tutulmuştur. Deneyler sonunda elde edilen veriler üzerinde, parametrelerin etki oranlarının belirlenmesi için varyans analizi tekniği uygulanmıştır. Sonuç olarak, aşınma üzerinde en önemli parametre yük olarak belirlenirken, her üç parametrenin de aşınma oranı üzerinde etkin olduğu tespit edilmiştir. Aşınma üzerinde yük parametresinin etkisi %57.9, zımparanın etkisi %19.7 ve işlemin etkisi ise %15.6 olarak belirlenmiştir.

Keywords

• DIN 1. 2379
• Kriyojenik işlem
• ısıl işlem
• varyans analiz
• minitab

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