The Influence of Plasma Nitriding Time on Mechanical Properties of Plasma Nitriding steel
seyed mohammad shafiei
1
(
Department of Mechanical Engineering
)
Hamed Raeisifard
2
(
Faculty of Industrial and Mechanical Engineering , Islamic Azad University Qazvin, Iran
)
sara sadat Tejareh
3
(
Department of Industrial Design, West Tehran Branch, Islamic Azad University, Tehran, Iran
)
الکلمات المفتاحية: mechanical testing, surface engineering, tool steels, tribology,
ملخص المقالة :
The aim of this study is to investigate the effect of plasma nitriding time on mechanical and tribological behavior of nitriding coatings produced by plasma-assisted chemical vapor deposition (PACVD). The heat treatment of quench and temper was carried out on hot work AISI H12 (DIN 1.2606) steel samples. A group of samples was plasma nitrided at 470 °C for 2 h in an atmosphere containing 25 vol. % nitrogen and 75 vol. % hydrogen and another group of samples was nitrided on for 4 h, 8 kHz frequency, and 33% duty cycle. The microstructural, mechanical, and tribological properties of the coatings were investigated using optical microscopy, microhardness tester, and pin-on-disc wear test. The load of wear test was 10 N and the samples were worn against different pins, ball-bearing steel (DIN1.3505). The results indicate that the difference of hardness between the samples with different time was 450 HV and the former samples showed a significant amount of wear resistance in comparison to the latter ones.
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