MICROSTRUCTURAL CHARACTERIZATION OF DC-PULSED PLASMA NITRIDED PLASTIC INJECTION MOULD STEEL P20
سال انتشار: 1391
نوع سند: مقاله کنفرانسی
زبان: انگلیسی
مشاهده: 1,405
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شناسه ملی سند علمی:
IMES06_415
تاریخ نمایه سازی: 8 بهمن 1391
چکیده مقاله:
Ion nitriding improves the lifecycle of mould steels. In this research plastic injection mould steel P20 was nitrided at 450, 500 and 550°C for 2.5, 5, 7.5 and 10 hours at gas mixture of 25%H2-75%N2 by using pulsed direct current (DC) plasma nitriding apparatus. Thickness of diffusion zone and compound layer was measured by optical microscopy and scanning electron microscopy. Regarding to the results of diffusion thickness measures, values of Q and D0 for nitrogen diffusion in steel substrate were calculated as 44.246(kJ/mol) and 2.47×10-10(m2/s) respectively. Results have shown that by increasing treatment temperature and time, nitrided layer thickness increased respectively. According to micro hardness results, ion nitriding leads to improving the hardness of P20 up to 3 times. By increasing time and temperature, hardness and hardness depth also increases accordingly
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نویسندگان
Nasim Nayebpashaee
PhD Student of materials engineering, Department of Metallurgy and Materials Engineering, Iran University of Science and Technology
Shahram Kheirandish
Professor, Department of Metallurgy and Materials Engineering, Iran University of Science and Technology
Mansour Soltanieh
Associate Professor, Department of Metallurgy and Materials Engineering, Iran University of Science and Technology