Demir Esaslı Sert Dolgu Kaplamaların Karakterizasyonu ve Kırılma Tokluğunun İncelenmesi

Year 2023, , 811 - 819, 28.06.2023

Melis Yurddaşkal

https://doi.org/10.35414/akufemubid.1198499

Abstract

Metal bileşenler genellikle kırılmalarından değil, aşınmalarından, orijinal boyutlarını ve kullanışlılıklarını kaybetmelerinden dolayı amaçlandığı gibi çalışmazlar. Sert dolgu kaplamalar, endüstride kullanılan bileşenlerin/aletlerin ömrünü uygun maliyetle arttırmasından ötürü oldukça popüler olarak kullanılmaktadır. Bu çalışmada, ferrokrom ve ferroboron tozu ilavesiyle masif tel ve krom karbür içerikli özlü tel kullanılarak S235JR çeliğinin yüzeyi metal ark kaynağı tekniği kullanılarak kaplanmıştır. Kaplamaların makro ve mikro sertlik testleri yapılmış, mikroyapı incelemeleri ve faz analizleri gerçekleştirilmiştir. Elde edilen sert kaplamalarda oluşan sert fazların kaplamanın kırılma tokluğu üzerindeki etkisini göstermek amacıyla indentasyon tekniği kullanılarak oluşan Palmqvist çatlakları ile kırılma toklukları hesaplanmıştır. Kaplamada oluşan sekonder sert faz morfolojisinin kırılma tokluğu üzerinde olumlu etkisi olduğu görülmüştür.

Keywords

sert dolgu kaplama, mikroyapı, makro indentasyon kırılma tokluğu, Palmqvist çatlağı

Characterization and Fracture Toughness Investigation of Iron Based Hardfacings

Abstract

Metal parts frequently fail to perform as intended not because they break but because they deteriorate over time and lose their original shape and functionality. Because they cost-effectively extend the life of components and tools, hardfacing coatings are very common in industry. In this study, the surface of S235JR steel was coated using metal arc welding technique, using massive and chrome carbide cored wires with the addition of ferrochrome and ferroboron powders. Macro and micro hardness tests, microstructure studies and phase analyzes of the coatings were carried out. The hard phases' effects on the coating's fracture toughness were demonstrated using the indentation technique, and the formation of Palmqvist cracks was used to calculate fracture toughness. It was observed that the morphology of secondary hard phases formed in the coating had a positive effect on the fracture toughness.

Keywords

hardfacing, microstructure, macro indentation fracture toughness, Palmqvist crack

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