Nitrogen solubility and nitride formation in FeCrNi alloys

Rawers, J. C.; Bennett, James E.; Doan, R.; Siple, J.

doi:10.1016/0956-7151(92)90418-e

Cited by 18 publications

(9 citation statements)

References 3 publications

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“…In this investigation, the microstructure is characterized relative to both the interstitial nitrogen and the nitride contents. The interstitial nitrogen contents are determined through the combined utilization of the Beeghly ester-halogen digestion method [7,8,9] and the LECO* Nitrogen Determinator, which are thoroughly *LECO is a trademark of LECO Corporation, St. Joseph, MI. described in the following references.…”

Section: Methodsmentioning

confidence: 99%

“…Differentiating enthalpy and incorporating into Eq. [7] gives [8] Equation [8] is inserted into the differential Gibb's free energy (dG ϭ dH Ϫ SdT Ϫ TdS) and is given as [9] where the ⌺ i n i is additional free energy, accounting for the addition of alloying elements to the solution, and i is the chemical potential of species i.…”

Section: Thermodynamic Modelsmentioning

confidence: 99%

“…The thermoelectric power coefficient involves the generation of an electric potential difference, ⌬V, under an applied temperature difference, ⌬T, given as [10] Under the assumption that the external work is electric work, by analogy to the thermodynamics of a reversible cell, the external work term becomes [11] and Eq. [9] can be rearranged as [12] where . Assuming equilibrium conditions, ⌬G ϭ 0, and solving Eq.…”

Section: Thermodynamic Modelsmentioning

confidence: 99%

See 2 more Smart Citations

Microstructural assessment of nitrogen-strengthened austenitic stainless-steel welds using thermoelectric power

Lasseigne

Olson

Kleebe

et al. 2005

Metall Mater Trans A

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The electronic properties of an alloy correlate directly to its microstructure. The thermoelectric power coefficient has been determined in this investigation to be a rapid and accurate measurement that can be used for microstructural assessment and correlated to achieve the maximum material performance of structural alloys. In high-nitrogen-strengthened stainless-steel welds, nitrogen partitions into solidsolution nitrogen and nitrides during the welding thermal cycle. The formation of nitrides results in a degradation of the mechanical properties and the corrosion resistance. Thermoelectric power measurements offer a means of assessing the weld-interstitial nitrogen content, which allows for a better correlation between the nitrogen content and the weld-metal microstructure and properties. Using pressure-composition-temperature (PCT) (activity) diagrams, thermodynamic models are developed to describe the relationship between the thermoelectric power coefficient as a function of the interstitial nitrogen content and the formed nitride content. These correlations between the electronic property measurements and the interstitial nitrogen content will allow for a faster, nondestructive, and improved property prediction of nitrogen-strengthened stainless steels.

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Section: Methodsmentioning

confidence: 99%

Section: Thermodynamic Modelsmentioning

confidence: 99%

Section: Thermodynamic Modelsmentioning

confidence: 99%

See 1 more Smart Citation

Microstructural assessment of nitrogen-strengthened austenitic stainless-steel welds using thermoelectric power

Lasseigne

Olson

Kleebe

et al. 2005

Metall Mater Trans A

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show abstract

“…[2000Sop] computed the phase equilibria of the quinary system, using the interaction parameters obtained by [1993Qiu] for the Cr-Fe-Mn-N system and by [1991Fri] for the Cr-Fe-N-Ni system. Due to inadequacy of the new experimental data, no attempt was made to improve the known interaction parameters or to find new higher-order parameters.…”

Section: Quinary Phase Equilibriamentioning

confidence: 99%

“…Partial phase relationships in this quinary system were determined by [2000Sop], who presented computed isothermal sections at 1,000 and 800°C and compared them with their experimental data. …”

mentioning

confidence: 99%

Cr-Fe-Mn-N-Ni (Chromium-Iron-Manganese-Nitrogen-Nickel)

Raghavan¹

2007

J Phs Eqil and Diff

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Challenges in Pressureless Sintering of Interstitially Alloyed TRIP Steel and Resulting Mechanical Properties

et al. 2018

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The focus of the current study is to investigate the challenges encountered in processing an interstitially alloyed stainless steel powder by means of an extrusion process derived from the manufacture of ceramics with subsequent pressureless sintering. Previous investigations reveal a distinct loss of nitrogen during conventional sintering in pure argon atmospheres due to the temperature/time regimes applied and the absence of a suitable partial pressure of nitrogen. Consequently, different flushing gases (consisting of argon and nitrogen) are used to keep the nitrogen content in the pre‐alloyed steel powder constant during consolidation. The resulting chemical compositions of the manufactured compacts are determined, as are the microstructures and the mechanical properties, which are recorded under quasi‐static compressive loading. A detailed analysis is conducted to determine the reasons for the loss of interstitial elements in the materials studied, a phenomenon caused by oxidation and reduction reactions throughout the processing chain. In addition, the differences between the materials in their work‐hardening behavior and in the kinetics of the TRansformation Induced Plasticity (TRIP) effect are discussed as a function of the amount of interstitial elements remaining in the sintered materials.

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Nitrogen solubility and nitride formation in FeCrNi alloys

Cited by 18 publications

References 3 publications

Microstructural assessment of nitrogen-strengthened austenitic stainless-steel welds using thermoelectric power

Microstructural assessment of nitrogen-strengthened austenitic stainless-steel welds using thermoelectric power

Cr-Fe-Mn-N-Ni (Chromium-Iron-Manganese-Nitrogen-Nickel)

Challenges in Pressureless Sintering of Interstitially Alloyed TRIP Steel and Resulting Mechanical Properties

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