Characteristics and Corrosion Behavior of Sinter-Aluminized P/M Steels

Abstract

In this study, the effects of different cold pressing pressures and sintering mediums on microstructure, micro hardness, and corrosion behavior of steels produced by powder metallurgy (PM) method from Distaloy SA powders, were examined. The PM samples were first subjected to two different cold pressing pressures being 150 MPa and 200 MPa, then to the sintering process in two different sintering mediums as aluminum and argon, for 5 hours at 1000°C. The densities and surface roughness of sinter-aluminized and only sintered samples were measured, and it was determined that their densities were increasing by the increase of cold pressing pressure and that their roughness was decreasing by the increase of cold pressing pressure. The determination of microstructural characteristics of PM samples was performed by the use of X-ray diffraction (XRD), scanning electron microscopy (SEM), and energy dispersive spectroscopy (EDS) devices. Corrosion tests were electrochemically conducted in 3.5 wt.% NaCl solution. It was determined that sinter-aluminized samples showed higher corrosion resistance than samples sintered in argon medium depending on the FexAly phases forming on the sinter-aluminized samples. Thus, the sinter-aluminizing process is promising for using PM materials in corrosive environments.

Keywords

• Powder metallurgy
• X-ray diffraction
• Sinter-aluminized
• Corrosion

Sinter-Alüminize T/M Çeliklerin Özellikleri ve Korozyon Davranışı

Öz

Bu çalışmada, Distaloy SA tozlarından toz metalurjisi (P/M) yöntemiyle üretilen çeliklerin farklı soğuk presleme basıncı ve sinterleme ortamının mikroyapı, mikrosertlik ve korozyon davranışlarına etkisi incelenmiştir. P/M numuneler; 150 MPa ve 200 MPa olmak üzere iki farklı soğuk presleme basıncıyla presleme işlemi sonrası; alüminyum ile argon olmak üzere iki farklı sinterleme ortamında 1000 °C'de 5 saat sinterleme işlemine tabi tutulmuştur. Sinter-alüminyumlanmış ve sadece sinterlenmiş örneklerin yoğunluk ve yüzey pürüzlülükleri ölçülmüş olup yoğunluklarının soğuk presleme basıncının artmasıyla arttığı yüzey pürüzlülüğünün ise azaldığı belirlenmiştir. P/M numunelerin mikroyapısal özelliklerinin belirleme işlemi X- ışını kırınımı difraksiyonu (XRD), taramalı elektron mikroskobu (SEM) ve enerji dağılımlı X-ışını spektroskopisi (EDS) cihazları kullanılarak gerçekleştirilmiştir. Korozyon deneyleri elektrokimyasal olarak %3,5 NaCl çözeltisinde gerçekleştirilmiştir. Sinter-alüminyumlanmış numunelerin yüzeyinde oluşan FexAly fazlarına bağlı olarak argon ortamında sinterlenmiş numunelere göre daha yüksek korozyon direnci gösterdiği tespit edilmiştir. Dolayısıyla sinter-alüminyumlama işlemi P/M malzemelerin korozitif ortamlardaki kullanımları için umut vadetmektedir.

Anahtar Kelimeler

• Toz metalurjisi
• X-ışını difraksiyonu
• Sinter alüminyumlama
• Korozyon

Kaynakça

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