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Nitrogen Solubility in Liquid Manganese and Ferromanganese Alloys

Title
Nitrogen Solubility in Liquid Manganese and Ferromanganese Alloys
Author
박종진
Issue Date
2001-08
Publisher
MINERALS METALS MATERIALS SOC
Citation
Metallurgical and Materials Transactions B: Process Metallurgy and Materials Processing Science, v. 32, issue. 4, page. 659-668
Abstract
The nitrogen solubilities in liquid manganese, manganese-iron, manganese-carbon, and manganese iron-carbon alloys have been measured by the gas-liquid metal equilibration technique in the temperature range of 1623 to 1823 K. The equilibrium nitrogen content in pure liquid manganese at an atmospheric nitrogen pressure is high, and it does not follow Sievert's law, i.e., f^sub N^ is not unity. The reduced nitrogen partial pressures by dilution with argon enabled us to obtain more reliable information on the thermodynamics of nitrogen in liquid manganese. The nitrogen dissolution follows Sievert's law at nitrogen contents below 1 wt pct. The standard free-energy change for the dissolution of nitrogen in pure liquid manganese has been determined as -67,222 + 30.32T J/g atom, with the standard state of nitrogen taken as a 1 wt pct solution. Carbon and iron in manganese-rich melts decrease the nitrogen solubility significantly. The first- and second-order interaction parameters between nitrogen and other elements in manganese alloy melts have been determined. The activity coefficient of nitrogen in a ferromanganese alloy melt can be expressed as log f^sub N^ = 0.005 (pct N) + 0.029 (pct N)^sup 2^ + 0.015 (pct Fe) + 0.09 (pct C) + 0.013 (pct C)^sup 2^ where the interaction parameters are independent of temperature in the temperature range of 1623 to 1823 K.
URI
https://www.proquest.com/docview/197111300?accountid=11283https://repository.hanyang.ac.kr/handle/20.500.11754/160297
ISSN
1073-5615
DOI
10.1007/s11663-001-0120-9
Appears in Collections:
COLLEGE OF ENGINEERING SCIENCES[E](공학대학) > MATERIALS SCIENCE AND CHEMICAL ENGINEERING(재료화학공학과) > Articles
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