تحسين خواص الفولاذ المنخفض الكربون باستخدام المعالجة المزدوجة (كربنة غازية+كرمنة صلبة)

The chromizing process is one of the surface treatment technologies that can produce chromium containing surface layers with high hardness, good corrosion, and wear resistance on the steel matrix. This study aims to improve the mechanical properties and increase corrosion and wear resistance on one of low carbon steel containing 0.15%C locally used in manufacturing some of machine elements. Pack chromizing process was applied at 1000 0C for 2, 4, and 6 h respectively. The depth of coated layer on the surface increases by increasing the coating time and the ratio of Ammonium Chloride in the chromizing mixture. This study showed the importance of carbon content on the treated samples. The increase of carbon content on the surface has an important effect in improving the mechanical properties and increasing corrosion and wear resistance. It was observed that the dual treatment (carburizing followed by chromizing) increased the tensile strength, surface hardness, and corrosion resistance.