A study on the redistribution of ion-implanted nitrogen in Ti-modified austenitic steel

Arunkumar, J.; David, C.; Anto, C. Varghese; Nair, K.G.M.; Kalavathi, S.; Rajaraman, R.; Amarendra, G.; Panigrahi, B. K.; Magudapathy, P.; Kennedy, J.

doi:10.1016/j.jnucmat.2011.04.062

Cited by 4 publications

(5 citation statements)

References 23 publications

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“…In their study [16], nitrogen was implanted to a fluence of 7.5 × 10 16 ions/cm 2 , where there could be trapping of nitrogen due to the possible formation of V-N complexes in great extent, and also when nitrogen is in excess, precipitates can form hindering the movement of nitrogen. In the present case also, we inferred from the positron experiments that there is trapping of nitrogen at vacancies [10]. This could give rise to a decrease in the concentration of free nitrogen available for diffusion.…”

Section: Resultssupporting

confidence: 66%

“…In order to explore this possibility, the depth profile of implantation-induced vacancy defects has been probed using positron annihilation spectroscopy. From the changes observed in the defect-sensitive S-parameter, the evidence for the formation of vacancy-nitrogen complexes in the peak damage region was revealed [10]. The as-implanted sample was subjected to isochronal annealing in steps of 50 K, and it was found that there was no significant alteration of the nitrogen concentration profile up to 823 K as compared to the as implanted profile.…”

Section: Resultsmentioning

confidence: 99%

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Application of Resonant Nuclear Reactions for Studying the Diffusion of Nitrogen and Silicon in Ti-Modified Stainless Steel

Arunkumar

David

Nair

et al. 2012

Advances in Materials Science and Engineering

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Resonant nuclear reaction analysis can be used for the study of diffusion behaviour of minor alloying elements in reactor structural materials. In the present paper,15N(p,αγ)12Cand30Si(p,γ)31Preactions have been used to profile the ion-implanted15Nand30Siin D9 alloy (titanium-modified austenitic stainless steel). The diffusion coefficients at various temperatures have been estimated from the broadening of the implantation profiles during thermal annealing, and the activation energies are deduced.

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Section: Resultssupporting

confidence: 66%

Section: Resultsmentioning

confidence: 99%

Application of Resonant Nuclear Reactions for Studying the Diffusion of Nitrogen and Silicon in Ti-Modified Stainless Steel

Arunkumar

David

Nair

et al. 2012

Advances in Materials Science and Engineering

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“…This is also indicated by the fact that the concentration of Ti + N has an increasing tendency in the shallower surface region and, conversely, a decreasing tendency in the deeper region, which corresponds to the vacancy concentration gradient from the TRIM simulation presented in our previous work [ 18 ]. The effect of point defects generated during ion implantation on nitrogen redistribution has also been observed in nitrogen-implanted, Ti-modified austenitic steel [ 22 ]. The distribution of radiation defects (especially vacancies) in the lattice after implantation was considered by the authors to be the origin of the observed redistribution of nitrogen to the surface [ 18 , 22 ].…”

Section: Resultsmentioning

confidence: 99%

“…The effect of point defects generated during ion implantation on nitrogen redistribution has also been observed in nitrogen-implanted, Ti-modified austenitic steel [ 22 ]. The distribution of radiation defects (especially vacancies) in the lattice after implantation was considered by the authors to be the origin of the observed redistribution of nitrogen to the surface [ 18 , 22 ]. Undoubtedly, annealing time and temperature can have a significant effect on structural changes.…”

Section: Resultsmentioning

confidence: 99%

Effect of Annealing on the Surface Hardness of High-Fluence Nitrogen Ion-Implanted Titanium

Vlcak,

Sepitka,

Koller

et al. 2023

Materials

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Commercially pure titanium grade II was kinetically nitrided by implanting nitrogen ions with a fluence in the range of (1–9)·1017 cm−2 and ion energy of 90 keV. Post-implantation annealing in the temperature stability range of TiN (up to 600 °C) shows hardness degradation for titanium implanted with high fluences above 6·1017 cm−2, leading to nitrogen oversaturation. Temperature-induced redistribution of interstitially located nitrogen in the oversaturated lattice has been found to be the predominant hardness degradation mechanism. The impact of the annealing temperature on a change in surface hardness related to the applied fluence of implanted nitrogen has been demonstrated.

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“…The application of austenitic stainless steels with  N phase layers may play an important role in improving its reliability in the borate solution-rich environment, such as the pressurized water reactor. However, there is little report on the corrosion-fatigue properties of  N phase in the borate solutions [11,12]. The influential mechanisms of nitrogen on the corrosion-fatigue properties improved by surface modification were not fully understood [13,14].…”

Section: Introductionmentioning

confidence: 99%

Corrosion-fatigue properties of plasma-based low-energy nitrogen ion implanted AISI 304 L austenitic stainless steel in borate buffer solution

Wang

Che

Lei

2016

Surface and Coatings Technology

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AISI 304L austenitic stainless steel was modified by using the plasma-based low-energy nitrogen ion implantation (PBLEII) at a process temperature of 400 o C for a processing time of 4 h in order to improve the corrosion-fatigue resistance of the austenitic stainless steel. A single high-nitrogen face-centered-cubic phase ( N) layer with a maximal nitrogen concentration of about 25 at.% was formed on the nitrogen-modified austenitic stainless steel. Compared with the original austenitic stainless steel, the γ N phase layer on the austenitic stainless steel possessed a significant improvement in corrosion resistance in the borate buffer solution with a pH value of 8.4. The corrosion-fatigue properties of the  N phase layer on the austenitic stainless steel were examined by the push-pull fatigue experiments with a ratio R of tensile and compression of-1 in the borate buffer solution. The  N phase layer has an increased corrosion-fatigue strength up to 230 MPa from 180 MPa of the original austenitic stainless steel with an apparent increase of about 28%. The corrosion-fatigue crack initiation in the  N phase layer was found as a controllable stage in the fracture process at the interface between the  N phase layer and the austenitic stainless steel matrix with the arc corrosion-fatigue source. Some tiny corrosion-fatigue striations were obtained on the corrosion-fracture surfaces of the  N phase layer. The high density of slip bands and dislocations in the  N phase layer was able to prevent the crack initiation and propagation, leading to improvement of the corrosion-fatigue properties in the borate buffer solution.

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A study on the redistribution of ion-implanted nitrogen in Ti-modified austenitic steel

Cited by 4 publications

References 23 publications

Application of Resonant Nuclear Reactions for Studying the Diffusion of Nitrogen and Silicon in Ti-Modified Stainless Steel

Application of Resonant Nuclear Reactions for Studying the Diffusion of Nitrogen and Silicon in Ti-Modified Stainless Steel

Effect of Annealing on the Surface Hardness of High-Fluence Nitrogen Ion-Implanted Titanium

Corrosion-fatigue properties of plasma-based low-energy nitrogen ion implanted AISI 304 L austenitic stainless steel in borate buffer solution

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