Farklı Matrisli Dökme Demirlerde Aşınma Özelliklerinin Gözden Geçirilmesi

Year 2023, Volume: 15 Issue: 1, 297 - 311, 31.01.2023

Ruziye Çamkerten

Abstract

Bu çalışmada, literatürde yer alan farklı matrise sahip dökme demirlerde matris yapı türlerinin aşınma özelliklerine etkileri gözden geçirilmiştir. Dökme demirlerde (DD) matris ferritik olduğunda aşınma kaybı her zaman daha yüksek olmaktadır. Perlitik matrisli DD’lerde aşınma direnci lamellar arası mesafe azaldıkça artmaktadır. Ferritik-perlitik çift matrisli DD’lerde aşınma direnci, perlit hacim oranındaki artışa paralellik göstermektedir. Martensitik matrisli DD’lerde aşındırıcıların kırılma miktarı artarak artan aşınmaya katkıda bulunmaktadır. Ferritik+martensitik çift matrisli DD’lerde martensitik yapı hacim oranı arttıkça aşındırıcı aşınma kaybı azalmaktadır. Östenitik matrisli DD’lerde östenitin daha düşük sertliği ve daha yüksek derecede plastik deformasyonu nedeniyle matrisin güçlü pekleşme sertleşmesi diğer matris yapılarınkini aşan bir sertlikle sonuçlanarak diğer matrislerden daha iyi aşınma direnci sergilemektedir. Ösferritik matrisli DD’lerde aşınma testi sırasında yüksek bölgesel gerilme veya plastik deformasyonun neden olduğu gerilim kaynaklı östenitten martensite dönüşüm (Transformation induced plasticity-TRIP) aşınma direncini artırmaktadır. Ayrıca yüksek aşınma direncine ösferritik yapının pekleşmeside katkıda bulunmaktadır. Ferritik+Ösferritik çift matrisli DD’lerde ösferritik yapı hacim oranı arttıkça aşındırıcı aşınma kaybı azalmaktadır. Literatürdeki çalışmaların sonuçlarına göre, aşınma direnci açısından matris türleri birbirleri ile karşılaştırıldığında genel olarak östenitik matrisler > ösferritik matrisler > martensitik matrisler > perlitik matrisler > ferritik olarak görülebilir. Aşınma direnci açısından çift matris türleri birbirleri ile karşılaştırıldığında ise genel olarak ferritik+ösferritik matrisler > ferritik+martensitik matrisler > ferritik+perlitik matrisler sıralamasını takip etmektedir.

Keywords

Dökme demirler, matris yapı türleri, aşınma özellikleri, Cast irons, matrix structure types, the wear properties

Supporting Institution

Gazi Üniversitesi

Project Number

GÜBAP 07/2019-20

Thanks

Çalışmamızı destekleyen Gazi Üniversitesi Bilimsel Araştırma Projeleri birimine (GÜBAP 07/2019-20) teşekkür ederiz.

Review Of Wear Properties In Different Matrix Cast Irons

Abstract

In this study, the effects of matrix structure types on the wear properties of cast irons with different matrices in the literature were reviewed. In cast irons (CI), the wear loss is always higher when the matrix is ferritic. Wear resistance of pearlitic matrix CIs increases with decreasing lamella distance. The wear resistance of ferritic-pearlitic dual matrix CIs shows parallelism with the increase in the pearlite volume fraction. In CIs with martensitic matrix, the fracture rate of abrasives increases, contributing to increased wear. In CIs with ferritic+martensitic dual matrix, abrasive wear loss decreases as the martensitic structure volume fraction increases. In CIs with austenitic matrix, the strong strain hardening of the matrix results in a hardness exceeding that of other matrix structures, exhibiting better wear resistance than other matrices, due to the lower hardness and higher degree of plastic deformation of the austenite. In CIs with ausferritic matrix, stress-induced austenite-to-martensite transformation (TRIP) caused by high local stress or plastic deformation during the abrasion test increases the wear resistance. In addition, the hardening of the ausferritic structure contributes to the high wear resistance. In CIs with Ferritic+Ausferritic dual matrix, abrasive wear loss decreases as the ausferritic structure volume fraction increases. According to the results of the studies in the literature, when the matrix types are compared with each other in terms of wear resistance, generally austenitic matrices > ausferritic matrices > martensitic matrices > pearlitic matrices > ferritic. When dual matrix types are compared with each other in terms of wear resistance, they generally follow the order of ferritic+ausferritic matrices > ferritic+martensitic matrices > ferritic+pelitic matrices.

Keywords

Cast irons, matrix structure types, the wear properties

Project Number

GÜBAP 07/2019-20

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