کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1661118 1517690 2009 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Effect of ion nitriding on the microstructure and properties of Maraging steel (250 Grade)
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد فناوری نانو (نانو تکنولوژی)
پیش نمایش صفحه اول مقاله
Effect of ion nitriding on the microstructure and properties of Maraging steel (250 Grade)
چکیده انگلیسی

In the present investigation, ion nitriding of Maraging steel (250 grade) has been carried out at three different temperatures i.e., at 435 °C, 450 °C and 465 °C for 10 h duration in order to achieve good wear resistance along with high strength required for the slat track component of aircraft. The microstructure of the base material and the nitrided layer was examined by optical and scanning electron microscope, and various phases present were determined by X-ray diffraction. Various properties, such as, hardness, case depth, tensile, impact, fatigue properties and corrosion resistance were investigated for both un-nitrided and ion-nitrided materials. It is observed that the microstructure of the core material remains unaltered and Fe4N is formed in the hardened surface layer after ion nitriding at all the three temperatures employed. Surface hardness increases substantially after ion nitriding. Surface hardness remains almost the same but case depth increases with the increase in ion nitriding temperature due to greater diffusivity at higher temperatures. Tensile strength, fatigue strength and corrosion resistance are improved but ductility and energy absorbed in impact test decrease on ion nitriding. These results are explained on the basis of microstructural observations. The properties obtained after ion nitriding at 450 °C for 10 h are found to be optimum when compared to the other two ion nitriding temperatures.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Surface and Coatings Technology - Volume 203, Issues 10–11, 25 February 2009, Pages 1530–1536
نویسندگان
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