Grazing incidence X-ray diffraction of SS304 steel surfaces modified by high- and low-pressure ion nitriding processes

Ueda, M.; Gomes, G. F.; Abramof, E.; Reuther, H.

doi:10.1016/j.surfcoat.2004.03.034

Cited by 10 publications

(10 citation statements)

References 12 publications

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“…More than 30% of the elements detected at 25 nm depth are nitrogen and even at 650 nm this percentage is over 20%. GDOS measurements (not shown here) confirmed both glancing XRD [13] as well as AES results and indicated a nitrogen penetration of more than 2 µm. Notice also that the amount of impurities introduced by this process is very low, concentrating them at the very surface of the samples (< 10 nm).…”

Section: Partsupporting

confidence: 69%

“…The hardness profile obtained shows that near 150 nm the increase of hardness is about 2.7× while even for 500 nm this factor is over 2.0×. In fact, at the depths lower than 100nm, the measurements indicate a decrease of the enhancement factor which could be due to a highly damaged surface (as was seen by glancing XRD results shown in a previous paper [13]). The AES profiling obtained for this treatment can be seen in Fig.…”

Section: Partsupporting

confidence: 53%

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Results from experiments on hybrid plasma immersion ion implantation/nitriding processing of materials

Ueda¹,

Gomes²,

Kostov³

et al. 2004

Braz. J. Phys.

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To improve the performance of critical part components, new methods for surface strengthening are being developed with success, like plasma immersion ion implantation (PIII) and hybrid surface treatments mixing PIII and ion nitriding processes. A combination of high pressure (4 × 10 1 P a), moderate temperature (up to 450 o C) glow discharge nitriding with low pressure (8 × 10 −2 P a) and low DC bias voltage ion nitriding (or DC PIII) was implemented. Depending on the particular conditions of the treatment and the depth probed, mixed phases of γN and ε were measured in the treated SS304 steel sample. This near surface modification resulted in an improved hardness (up to a factor of 2.7 ×) of the sample which could also enhance its wear properties. Surface modification of Ti6Al4V alloy and SS304 steel by a combination of PIII and subsequent ion nitriding was investigated as well. Nitrogen ions were implanted into the specimens at 15 keV and then ion nitrided at low pressure (7 × 10 −2 P a) with a bias of -800 V. Compared to the untreated samples, the hardness of Ti6Al4V alloy and the steels could be improved significantly. AES results indicated high retained doses in both samples, confirming the high efficiency of this hybrid process.

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Section: Partsupporting

confidence: 69%

Section: Partsupporting

confidence: 53%

Results from experiments on hybrid plasma immersion ion implantation/nitriding processing of materials

Ueda¹,

Gomes²,

Kostov³

et al. 2004

Braz. J. Phys.

View full text Add to dashboard Cite

show abstract

“…2) nas amostras 1, 2 e 3, observou-se a formação da austenita expandida (γ N ), evidenciada pela presença de picos alargados e deslocados para a esquerda do pico de Feγ (111) (4) , como resultado da distorção da rede cristalina provocada pela supersaturação com nitrogênio. A diferença da intensidade dos picos está diretamente relacionada à posição das amostras no interior ( Fig.…”

Section: Resultados E Discussõesunclassified

“…O processo 3IP no interior do tubo não ocorre de maneira uniforme em toda a sua extensão. A presença da fase austenita expandida decorre de uma grande concentração de nitrogênio implantada no aço inox, aumentando assim a dureza da superfície e a sua resistência a corrosão (4) . Todos esses efeitos mecânicos e tribológicos positivos no interior de tubos evidenciam os efeitos bené cos da técnica de 3IP para o tratamento e modi cação de superfícies.…”

Section: A B Conclusãounclassified