Acquired Properties Comparison of Solid Nitriding, Gas Nitriding and Plasma Nitriding in Tool Steels

Almeida, Elisangela Aparecida dos Santos de; Milan, Júlio César Giubilei; Costa, César Edil da

doi:10.1590/1516-1439.255513

Cited by 15 publications

(6 citation statements)

References 15 publications

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“…Figure 9 shows that the friction coefficients were ∼ 0.70 and ∼0.68 for AISI H11 and AISI H13, respectively, at room temperature. Such values were also observed by other researchers [38,39]. After plasma nitriding, both AISI H11and AISI H13 pin specimen showed lower coefficient of friction values.…”

Section: Resultssupporting

confidence: 87%

“…After plasma nitriding, both AISI H11and AISI H13 pin specimen showed lower coefficient of friction values. Literature studies revealed that plasma-nitriding treatment reduced the coefficient of friction and this reduction is attributed to the high surface hardness obtained after this treatment [38]. However, the coefficient of friction of AISI H11 was found to be significantly lower (0.399) than AISI H13 (0.581) tool steels.…”

Section: Resultsmentioning

confidence: 99%

“…Since the hardness values are similar to that of Fe 2 O 3 phases, we can assume that these layers are oxide layers. Such layers were also identified as oxide layers by EDS measurements by many researchers [38,48].…”

Section: Visual Examination Of Worn Surfacesmentioning

confidence: 99%

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High-temperature tribological studies of plasma-nitrided tool steels

Kumar

Kaur

Singh

et al. 2018

Surface Engineering

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During hot forging/forming operations, the die surface and near surface region is subjected to severe wear. The failure of dies originates from the surface region. In this research work, plasma nitriding was done on two hot forming tool steels namely AISI H11 and AISI H13. The aim is to develop a hard and wear resistance surface required for hot forming operations. The mechanical and microstructural properties of the developed nitrided layer were critically examined. Thereafter the tribological characteristics of the untreated and plasma-nitrided specimens were studied on high-temperature pin-on-disc tribometer under the constant load of 25 N, sliding speed 0.5 m s −1 , sliding distance of 1500 m at different temperatures ranging from room temperature to 600°C. The results showed that the main wear mechanisms is predominantly adhesive at room temperatures and 200°C and a combination of adhesive and abrasive at elevated temperatures (400°C and 600°C).

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Section: Resultssupporting

confidence: 87%

Section: Resultsmentioning

confidence: 99%

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High-temperature tribological studies of plasma-nitrided tool steels

Kumar

Kaur

Singh

et al. 2018

Surface Engineering

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“…For a depth value higher than 20 µm, the hardness value of the sample with plasma nitriding treatment decreases abruptly, reaching a value similar to the sample without thermal treatment. Other authors [13] studied the surface hardening behavior of tool steels by using ion and solid nitriding treatment methods, reporting similar behavior in hardness for solid nitriding when is compared with plasma nitriding.…”

Section: Microhardness Evaluationmentioning

confidence: 85%

Appraisal of Surface Modified AISI 316 L Stainless Steels by Plasma and Solid Nitriding Techniques

Guardián¹,

Rosales-Cadena²,

Valle-Mata³

et al. 2020

MSA

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AISI 316 L stainless steels type was surface modified by ion and solid nitriding treatment. It was demonstrated that a surface activation pretreatment in samples based in acid mixture accompanied with NH 4 NO 3 solution inside the container, can produce an efficient nitrogen diffusion process. As compared with ion nitriding treatment (20%N 2-80%H 2), the samples were treated with solid nitriding technique, using Fe 4 KCN based compound at the same time and temperature (6 h and 500˚C respectively). Superficial layers with a depth of 45 µm average were obtained with six hours treatment. Hardness surface values of two surface treatments present an increased value of approximately three times with respect to the matrix sample. Wear evaluation indicated low regimes of weight losses for both treatments. Oxidative-adhesive result is to be the predominant operating wear mechanism. Positive results were obtained in solid nitriding technique as compared with the expensive ion nitriding technique.

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“…Analisando as micrografias juntamente o difratograma das amostras, interpreta-se que o aumento da dureza superficial na condição B3DC se deu por solução sólida, enquanto a condição B3RF além deste mecanismo houve a precipitação que contribuiu para o aumento da dureza. Nos trabalhos reportados para o H13 esferoidizado não houve relato desta microestrutura de agulhas, visto que as micrografias realizadas pelos autores abrangeram uma área maior da subsuperfície (De Almeida et al, 2015;Cruz et al, 2006). FIGURA 6.…”

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