By Hossein Aghajani, Sahand Behrangi (auth.)
This publication makes a speciality of the impact of plasma nitriding at the houses of steels. Parameters of alternative grades of steels are thought of, comparable to structural and constructional steels, stainless steels and instruments steels. The reader will locate in the textual content an creation to nitriding remedy, the root of plasma and its roll in nitriding. The authors additionally deal with the benefits and downsides of plasma nitriding compared to different nitriding equipment.
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Extra resources for Plasma Nitriding of Steels
Example text
Nakajima et al. [8] (see Sect. 1) evaluated the mechanical properties of AISI 304 austenitic stainless steel samples after post-solution treatment. 1 mm. For post-solution treated sample the hardness was 280 HV, however, with higher core hardness compared to the just nitrided one. The hardness of the sample solution treated at 1200 °C for 45 min reached to the hardness of untreated sample in depth of 1 mm. This trend was also reported for durations of 60 and 90 min. Although the interior hardness for these two samples was higher compared to that of 45 min.
4] (see Sect. 1) did some experiments to find a relationship between surface hardness and plasma nitriding temperature for AISI 316L austenitic Fig. 1) Wear rate (mg km−1) Process Process parameters Phase composition No. 06 No. 98 No. 58 No. 33 No. 21 No. 22 stainless steel. They found a very steep trend for microhardness increasing on the surface of the sample (as found by Wang et al. [2] shown in Fig. 25) when nitrided at temperatures below 400 °C, but it turned to a gradual trend when temperature reached beyond 450 °C.
19] studied plasma nitriding of 17-4PH martensitic stainless steel and found almost the same results found by Li et al. [18]. They applied the following conditions: temperatures of 350, 370, 390, 420, 460, and 500 °C, atmosphere of 25 % N2 + 75 % H2, pressure of 500 Pa, and durations of 10, 20 and 30 h. For samples nitrided under 420 °C, a bright layer was observed. This was due not to have been attacked by etchant solution. However, the upper part of the layer treated at 420 °C for 20 h was slightly etched, indicating the nitrides precipitation during the treatment.