The Effect of Boriding Temperature and Time on the Structural and Mechanical Properties of M42 Steel

Abstract

In this study, the effect of boriding temperature and time on the structural and mechanical properties of M42 high speed steel were investigated. Samples placed in Ekabor II powder were exposed to pack boriding treatment at 900°C and 1000°C for 4 hour and at 950°C for 2, 4 and 6 hours. Scanning electron microscope (SEM) images indicate that boron diffuses into the samples and a sawtooth-like cross-sectional morphology is formed. The presence of boron has also been proven by Energy Dispersive X-ray spectrometry (EDX). In addition, it was determined that boron layer thickness increased with increasing boriding temperature. When the microhardness values were examined, it was observed that the sample borided at the highest temperature had the highest hardness value and the hardness values decrease with the decreasing of boriding temperature. Similar results were also obtained regarding the boriding time. The highest microhardness and layer thickness values were obtained after 6 hours of boriding. Additionally, it was observed that the hardness values of borided samples decreased as they moved from the surface to the inner parts.

Keywords

• : Boriding
• Boriding temperature
• Boriding time
• M42 steel
• Mechanical properties

Borlama Sıcaklığının ve Süresinin M42 Çeliğinin Yapısal ve Mekanik Özelliklerine Etkisi

Öz

Bu çalışmada borlama sıcaklığının ve süresinin M42 yüksek hız çeliğinin yapısal ve mekanik özellikleri üzerine etkisi incelenmiştir. Ekabor II tozu içerisine yerleştirilen numuneler 900℃ ve 1000℃ derecede 4 saat; 950°C derecede 2, 4 ve 6 saat kutu borlama işlemine maruz bırakılmıştır. Taramalı elektron mikroskop (SEM) görüntüleri incelendiğinde borun numunlerin içerisine difuz ettiği ve testere dişlisine benzer kesit morfolojisi oluştuğu görülmektedir. Borun varlığı enerji dağılım x-ışını spektrometresi (EDX) ile de ispatlanmıştır. Bunun yanında, borlama sıcaklığın artmasıyla bor tabaka kalınlıklarının da arttığı tespit edilmiştir. Mikrosertlik değerleri incelendiğinde en yüksek sıcaklıkta borlanan numunenin en yüksek sertlik değerine sahip olduğu ve borlama sıcaklığının düşmesiyle beraber sertlik değerlerinin azaldığı tespit edilmiştir. Benzer sonuçlar borlama süresiyle ilgili olarak da görülmüştür. En yüksek mikrosertlik ve tabaka kalınlığı değerleri 6 saatlik borlama sonucunda elde edilmiştir. Ayrıca, borlanmış numunelerin yüzeyden iç kısımlara doğru gidildikçe sertlik değerlerinin düştüğü görülmüştür.

Anahtar Kelimeler

• Borlama
• Borlama sıcaklığı
• Borlama süresi
• M42 çeliği
• Mekanik özellikler

Kaynakça

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