The Neutron-Spectroscopy Proof of the Strong Cr-N Interactions in Nitrogen Stainless Steels

Sumin, V. V.; Chimid, G.; Rashev, Ts.; Saryivanov, L.

doi:10.4028/www.scientific.net/msf.318-320.31

Cited by 20 publications

(10 citation statements)

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“…[21] The diffusion of Nb in the austenitic matrix is significantly decelerated by high Mn content. [22] On the other hand, the existence of Cr-N, [23] Nb-N [24] atomic pairs and clusters in nitrogen containing austenite at higher temperatures can play the dominant role in decreasing the diffusion rate of Nb and Cr. Thus, the enhanced thermal stability of the carbonitrides is also due to the high Mn and high N contents in the system.…”

Section: Resultsmentioning

confidence: 97%

Improved Creep Behavior of a High Nitrogen Nb-Stabilized 15Cr-15Ni Austenitic Stainless Steel Strengthened by Multiple Nanoprecipitates

Jung

Suh

2011

Metall Mater Trans A

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Austenitic stainless steels are expected to be a major material for boiler tubes and steam turbines in future ultra-supercritical (USC) fossil power plants. It is of great interest to maximize the creep strength of the materials without increasing the cost. Precipitation strengthening was found to be the best and cheapest way for increasing the creep strength of such steels. This study is concerned with improving creep properties of a high nitrogen Nb-stabilized 15Cr-15Ni austenitic alloy through introducing a high number of nanosized particles into the austenitic matrix. The addition of around 4 wt pct Mn and 0.236 wt pct N into the 15Cr-15Ni-0.46Si-0.7Nb-1.25Mo-3Cu-Al-B-C matrix in combination with a special multicycled aging-quenching heat treatment resulted in the fine dispersion of abundant quantities of thermally stable (Nb,Cr,Fe)(C,N) precipitates with sizes of 10 to 20 nm. Apart from the carbonitrides, it was found that a high number of coherent copper precipitates with size 40 to 60 nm exist in the microstructure. Results of creep tests at 973 K and 1023 K (700°C and 750°C) showed that the creep properties of the investigated steel are superior compared to that of the commercial NF709 alloy. The improved creep properties are attributed to the improved morphology and thermal stability of the carbonitrides as well as to the presence of the coherent copper precipitates inside the austenitic matrix.

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Section: Resultsmentioning

confidence: 97%

Improved Creep Behavior of a High Nitrogen Nb-Stabilized 15Cr-15Ni Austenitic Stainless Steel Strengthened by Multiple Nanoprecipitates

Jung

Suh

2011

Metall Mater Trans A

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“…The occurrence of Cr-N SRO phenomena [11][12][13] and the resultant interactions with dislocations and stacking faults are believed to play a major role in the deformation behavior of these alloys. The strong affinity between Cr and N atoms generates Cr-N SRO clusters.…”

Section: Introductionmentioning

confidence: 99%

Temperature effect on deformation mechanisms and mechanical properties of a high manganese C+N alloyed austenitic stainless steel

Mosecker

Pierce

Schwedt

et al. 2015

Materials Science and Engineering: A

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“…The diffusion of Nb in the austenitic matrix is significantly decelerated by the high Mn content [22,23]. On the other hand, the existence of Cr-N [24] and Nb-N [25] atomic pairs and clusters in the nitrogen containing austenite can play a dominant role in decreasing the Nb diffusion rate. Thus, the lower Nb diffusivity (or in other words the enhanced thermal stability of the primary Nb(C,N) F precipitates) in the studied steel is also due to the high Mn and the high N content in the studied alloy system.…”

Section: Precipitation Behavior Of the Carbo-nitridesmentioning

confidence: 99%

Niobium carbo-nitride precipitation behavior in a high nitrogen 15Cr-15Ni heat resistant austenitic stainless steel

Jung

2011

Met. Mater. Int.

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A high nitrogen 15Cr-15Ni niobium-stabilized austenitic alloy has been produced and subjected to a special heat treatment consisting of 5 hours of solution treatment at 1270°C followed by hot rolling, quenching and subsequent aging at temperatures of 700°C to 800°C. It was found that fine dispersion of nano-sized thermally stable primary Nb(C,N) precipitates had already formed in the as-cast condition. The particles were presented at all examined stages of the TMT process (as-homogenized, as-solution treated and as-aged conditions). Secondary precipitates Nb(C,N) were densely formed during subsequent aging; these precipitates had sizes of 4 nm to 5 nm. Both the primary and secondary Nb(C,N) particles showed excellent thermal stability within the temperature range of 700°C to 800°C. The creep properties of the studied alloy at 750°C were superior when compared to those of commercial type 347 stainless steel.

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The Neutron-Spectroscopy Proof of the Strong Cr-N Interactions in Nitrogen Stainless Steels

Cited by 20 publications

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Improved Creep Behavior of a High Nitrogen Nb-Stabilized 15Cr-15Ni Austenitic Stainless Steel Strengthened by Multiple Nanoprecipitates

Improved Creep Behavior of a High Nitrogen Nb-Stabilized 15Cr-15Ni Austenitic Stainless Steel Strengthened by Multiple Nanoprecipitates

Temperature effect on deformation mechanisms and mechanical properties of a high manganese C+N alloyed austenitic stainless steel

Niobium carbo-nitride precipitation behavior in a high nitrogen 15Cr-15Ni heat resistant austenitic stainless steel

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