ISSN 2594-5327
65º Congresso ABM — vol. 65, num.65 (2010)
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To increase wear response plasma nitriding have been used with some limitations for martensitic stainless steel type AISI 420. Problems are related to the combination among: hardening, corrosion resistance, wear performance and substrate hardness after the surface treatment. The present paper shows the study of a combination of different heat treatments procedures with plasma nitriding surface treatment using different parameters for MSS AISI 420. Different heat treatments procedures were studied previously to nitriding for a substrate hardness range of 38–50 HRC. Samples were nitrided using DC-Pulsed plasma process. The nitriding temperature ranged from 480 to 560oC, 4 to 16 hours. Samples were characterized by optical microscopy and hardness was evaluated by Rockwell method for substrate and Vickers microhardness for the nitride case. The results show a high hardening effect after plasma nitriding, 1400HV. For substrates treated to 50 HRC the nitriding temperature has a strong effect on the case hardening behavior. Increasing nitriding temperature from 480 to 560oC the substrate hardness decrease considerably and the expected nitriding potential hardening effect is missing. Using 38 HRC as initial substrate hardness the hardening effect is preserved over the same nitriding temperature range. As a consequence different planning between heat treatment and nitriding cycles are discussed.
To increase wear response plasma nitriding have been used with some limitations for martensitic stainless steel type AISI 420. Problems are related to the combination among: hardening, corrosion resistance, wear performance and substrate hardness after the surface treatment. The present paper shows the study of a combination of different heat treatments procedures with plasma nitriding surface treatment using different parameters for MSS AISI 420. Different heat treatments procedures were studied previously to nitriding for a substrate hardness range of 38–50 HRC. Samples were nitrided using DC-Pulsed plasma process. The nitriding temperature ranged from 480 to 560oC, 4 to 16 hours. Samples were characterized by optical microscopy and hardness was evaluated by Rockwell method for substrate and Vickers microhardness for the nitride case. The results show a high hardening effect after plasma nitriding, 1400HV. For substrates treated to 50 HRC the nitriding temperature has a strong effect on the case hardening behavior. Increasing nitriding temperature from 480 to 560oC the substrate hardness decrease considerably and the expected nitriding potential hardening effect is missing. Using 38 HRC as initial substrate hardness the hardening effect is preserved over the same nitriding temperature range. As a consequence different planning between heat treatment and nitriding cycles are discussed.
Palavras-chave
Martensitic stainless steel; Heat treatment; Plasma nitriding.
Martensitic stainless steel; Heat treatment; Plasma nitriding.
Como citar
Pinedo, Carlos Eduardo;
Monteiro, Waldemar Alfredo.
INFLUENCE OF HEAT TREATMENT AND PLASMA NITRIDING PARAMETERS ON HARDENING AN AISI 420 MARTENSITIC STAINLESS STEEL
,
p. 3831-3838.
In: 65º Congresso ABM,
Rio de Janeiro,
2010.
ISSN: 2594-5327
, DOI 10.5151/2594-5327-16758
