Bilyalı dövme ve plazma nitrürleme işlemlerinin AISI 4140 çeliğinin aşınma dayanımına etkisi

Year 2024, , 1126 - 1135, 29.04.2024

Azmi Erdoğan , Okan Ünal , Mustafa Gök , Soner Özdemir , Sabri Alkan

https://doi.org/10.29130/dubited.1225813

Abstract

Mevcut çalışmada endüstriyel uygulamalarda sıklıkla kullanılan AISI 4140 çeliğinin yüzey özelliklerinin geliştirilmesi ile aşınma dayanımının nasıl değiştiğinin belirlenmesi amaçlanmıştır. Bu kapsamda AISI 4140 çeliği farklı iki şiddette bilyalı dövme işlemine ve plazma nitrasyon işlemlerine tabi tutulmuştur. Mikroyapıda meydana gelen değişimler SEM ve XRD aracılığıyla belirlenirken yüzey dayanımında meydana gelen değişim mikrosertlik ölçümü ile belirlenmiştir. Plazma nitrürleme sonucunda yüzeyde oluşan ilave katmanın demir nitrür fazları olduğu görülmüş bununla beraber bilyalı dövme işlemlerinden sonra herhangi bir faz değişimi meydana gelmemiştir. Tüm işlemlerle birlikte numunelerin yüzey sertliklerinde artış sağlanmış ve plazma nitrürleme ile yüzeyde 700 HV0.2’ye varan sertlik artışı görülmüştür. Buna bağlı olarak en iyi aşınma dayanımı plazma nitrürleme işlemi ile sağlanmıştır. Aşırı bilyalı dövme de aşınma kayıplarının kayda değer miktarda azaltırken geleneksel bilyalı dövme işlemi aşınma dayanımı üzerinde sınırlı bir etki göstermiştir. Uygulanan yüzey modifikasyon işlemlerinin sağladığı sertlik artışı aşınma dayanımında görülen artışa neden olarak gösterilmiştir. Bilyalı dövmede beklenen etkinin görülmemesi ise yüzeyde oluşan pürüzlülüğe atfedilmiştir.

Keywords

AISI 4140, Bilyalı Dövme, Plazma Nitrürleme, Shot Peening, Plasma Nitriding

Supporting Institution

Bartın Üniversitesi

Project Number

2021-FEN-CY-005

Effect of shot peening and plasma nitriding processes on wear resistance of AISI 4140 steel

Abstract

It is aimed to determine how the wear resistance changes by improving the surface properties of AISI 4140 steel, which is frequently used in industrial applications. In this context, AISI 4140 steel was subjected to two different intensities of shot peening and plasma nitration processes. While the changes in the microstructure were determined by SEM and XRD, the change in the surface strength was determined by the microhardness measurement. It was observed that the extra layer formed on the surface as a result of plasma nitriding was iron nitride phases, however, no phase change occurred after the shot peeening processes. All processes increased the surface hardness of the samples and an increase of up to 700 HV was observed on the surface with plasma nitriding. Accordingly, the best wear resistance was achieved by plasma nitriding process. Conventional shot peening had a limited effect on wear resistance, while severe shot peening reduced wear losses considerably. The increase in hardness provided by the applied surface modification processes has been shown to cause the increase in wear resistance. The lack of the expected effect in shot peening is attributed to the roughness on the surface.

Keywords

AISI 4140, Shot Peening, Plasma Nitriding

Project Number

2021-FEN-CY-005

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