Investigation of Mechanical Properties of Mo Steels Containing Nickel in Different Ratios Produced by Powder Metallurgy Method

Öz

Steels are iron-based materials containing up to 2.06% C (carbon). Manganese, Phosphorus, Sulfur and Silicon are elements originating from the raw material during production and are found in certain proportions within the steel. Other elements (Cr, Ni etc.) are added to the steel in desired amounts. These additions vary according to the desired feature and the steel material has a much wider usage area thanks to these alloying elements. The clearest indicator of this is that alloy steels are the most widely used engineering material today. In this study, 0.55 wt% graphite and 3% Mo addition as well as different (0-1 and 3 Ni) Ni were added into the Fe matrix by Powder Metallurgy (TM) method. The obtained powder material was filled into the mold in the form of a tensile specimen designed in ASTM E8M standards and compressed in one direction at a pressing pressure of 750 Mpa. The samples produced as a result of this process were sintered in the sinter furnace at 1400 ⁰C in an argon atmosphere and alloyed steel materials in different combinations were produced. Tensile test was applied to steel samples with different chemical compositions. As a result of the increase in the % (percentage) weight ratios of the Ni alloy elements, an increase in the mechanical properties was determined.

Anahtar Kelimeler

• Powder Metallurgy
• Mo Alloy Steels
• Ni addition
• Mechanical Properties

Toz Metalurjisi Yöntemi ile Üretilen Farklı Oranlarda Nikel İçeren Mo Çeliklerinin Mekanik Özelliklerinin İncelenmesi

Öz

Çelikler, içerisinde en fazla %2,06 C(karbon) içeren demir esaslı malzemelerdir. Mangan, Fosfor, Kükürt ve Silisyum üretim sırasında hammaddeden kaynaklanan elementlerdir ve çelik bünyesinde belirli oranlarda bulunur. Diğer elementler ise (Cr, Ni vb.) istenilen miktarlarda çelik bünyesine eklenir. Bu eklemeler istenilen özelliğe göre değişkenlik gösterir ve çelik malzeme bu alaşım elementleri sayesinde çok daha geniş bir kullanım alanına sahip olmuştur. Bunun en net göstergesi alaşımlı çeliklerin günümüzde en çok kullanılan mühendislik malzemesi olmasıdır. Bu çalışmada Toz Metalürjisi (TM) yöntemi ile Fe matris içerisine ağırlık olarak 0,55 grafit ve % 3 Mo ilavesinin yanı sıra farklı oranlarda (0-1 ve 3 Ni) Ni ilave edilmiştir. Elde edilen toz malzeme ASTM E8M standartlarında tasarlanmış çekme numunesi şeklinde kalıp içerisine doldurulmuş ve 750 Mpa presleme basıncında tek yönlü sıkıştırılmıştır. Bu işlem sonucunda üretilen numuneler sinter fırınında 1400 ⁰C sıcaklıkta argon atmosferinde sinterlenmiş ve farklı kombinasyonlarda alaşımlı çelik malzeme üretimi gerçekleştirilmiştir. Farklı kimyasal bileşime sahip çelik numunelere çekme testi uygulanmıştır. % ağırlık olarak Ni alaşım elementlerinin oranlarının artması sonucunda mekanik özelliklerde artış tespit edilmiştir.

Anahtar Kelimeler

• Toz Metalürjisi
• Mo Alaşımlı Çelikler
• Ni ilavesi
• Mekanik Özellikler

Kaynakça

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