Investigation of the effect of austenitizing temperature on wear and corrosion resistance of AISI 440B martensitic stainless steel

Öz

Martensitic stainless steels are distinguished from other stainless steels by their good mechanical properties and moderate corrosion resistance. The need for superior properties in certain applications has led to extensive research into improving the performance of these steels. For this, it is recommended that the heat treatment parameters be determined correctly. In this study, it has been revealed that the austenitization temperature of AISI 440B martensitic stainless steel has a significant effect on wear and corrosion resistance. As the austenitization temperature increases, Cr23C6 carbides dissolve and C and Cr enrichment occur in the austenite matrix. While Cr enrichment improves corrosion resistance, C enrichment increases material hardness. However, at high austenitizing temperatures, the amount of residual austenite increases due to the decrease of Mf. Since austenite grain coarsening also occurs, a significant decrease in hardness occurs. On the other hand, due to the high carbon content, distortions occur in the crystal lattice of the martensite phase, which negatively affects the stability of the protective oxide film and reduces the corrosion resistance. In this study, the optimum austenitization temperature was determined as 1080°C to obtain the best wear and corrosion resistance.

Anahtar Kelimeler

• Martensitic stainless steel
• wear test
• corrosion test

AISI 440B martenzitik paslanmaz çeliğinin aşınma ve korozyon dayanımına östenitleme sıcaklığının etkisinin incelenmesi

Öz

Martenzitik paslanmaz çelikler iyi mekanik özellikleri ve orta derecede korozyon dayanımları ile diğer paslanmaz çeliklerden ayrılmaktadırlar. Belirli uygulamalarda üstün özelliklere duyulan ihtiyaç, bu çeliklerin performansının iyileştirilmesi konusunda geniş araştırmalara yol açmıştır. Bunun için ısıl işlem parametrelerinin doğru belirlenmesi önerilmektedir. Bu çalışmada AISI 440B martenzitik paslanmaz çeliğin östenitleme sıcaklığının aşınma ve korozyon dayanımına önemli ölçüde etkilediğini ortaya konmuştur. Östenitleme sıcaklığı arttıkça Cr23C6 karbürleri çözünmekte ve östenit matriste C ve Cr zenginleşmesi meydana gelmektedir. Cr zenginleşmesi korozyon dayanımını iyileştirirken, C zenginleşmesi malzeme sertliğini artırmaktadır. Ancak yüksek östenitleme sıcaklıklarında, Mf ‘in düşmesi sebebiyle kalıntı östenit miktarı artmaktadır. Aynı zamanda östenit tane irileşmesi de meydana geldiğinden, sertlikte önemli derecede azalma meydana gelmektedir. Öte yandan yüksek karbon içeriği sebebiyle martenzit fazın kristal kafesinde çarpılmalar meydana gelmekte olup, bu da koruyucu oksit filmin kararlılığını olumsuz etkileyerek korozyon dayanımını düşürmektedir. Bu çalışmada, en iyi aşınma ve korozyon dayanımı elde etmek için en uygun östenitleme sıcaklığı 1080°C olarak tespit edilmiştir.

Anahtar Kelimeler

• Martenzitik paslanmaz çelik
• aşınma testi
• korozyon testi.

Kaynakça

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