Structural Changes of Nitrogen Ferrite After Aging in Temperature Interval up to 100 °С
Keywords:
nitric ferrite, aging, gas carbonitriding, micro-hardness, X-ray structural analysis
Abstract
This paper aims to determine the extent of aging of nitrogen ferrite at temperatures below 100 °C and the structural and strength changes that occur in the process. The tests are carried out on samples of technically pure iron (Armco). The specimens are pre-deformed by tension and re-crystallisation heating to achieve a large-grain ferrite structure. A large-grained structure has been chosen to more accurately track the change in micro-hardness of the individual grains during the aging process. Nitric ferrite results from gas carbonitriding and subsequent hardening. Upon hardening, the samples are stored in a refrigerator, and then the surface layer formed is removed through electrochemical corrosion. Afterwards, aging heat treatment at temperatures below 100 °C is undertaken. After the aging process, micro-hardness of the individual grains is examined and X-ray structural analysis is performed.
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References
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[3]. Christiansen Т., Somers М. А. J., Characterisation of Low Temperature Surface Hardened Stainless Steel, Struers Journal of Materialography, p. 2-17, 9/2006.
[4]. Grachov S. V., Baras V. R., Thermomechanical treatment of age hardening austenitic steels, Ind. Heat., vol. 47, no. 10, p. 20-23, 1980.
[5]. Kubota S., Xia Y., Tomota Y., Work-hardening Behavior and Evolution of Dislocation-microstructures in High-nitrogen Bearing Austenitic Steels, ISIJ International, 38(5), 474, 1998.
[6]. Llewellyn D. T., Hudd R. C., Steels: Metallurgy and applications, 3rd Edition, Butterworth-Heinemann, 400, 1998.
[7]. ***, Handbook: Steel and alloys grades and properties, http://www.steelnumber.com/en/steel_composition_eu.php?name_id=18.
[8]. Marchev К., Landis М., Valletio R., Cooper C. V., Giessen В. С., The m – Phase Layer on Ion-Nitrided Аustenitic Stainless Steel (III) An Expitaxial Relationship Between the m – Phase and the γ Parent Phase and a Review the m – Phase and the γ Parent Phase and a Review of Structural Identifications of This Phase, Surface and Coatings Technology, 116-119, p. 184-188, 1999.
[9]. Peralta P. D., Dislocation structure and cyclic plasticity, Encycl. Mater. Sci. Technol., Elsevier, p. 2222-2235, 2001.
[10]. Podgomik В., Vizintin J., Ronkainen Н., Holmberg К., Friction and Wear Properties of DLC-coated Plasma Nitrided Steel in Unidirectional and reciprocating Sliding, Thin Solid Films 377-378, p. 254-260, 2000.
[11]. Podgornik В., Vizintin J., Wanstrand О., Larsson М., Hogmark S., Ronkainen Н., Holmberg К., Tribological Properties of Plasma Nitrided and Hard Coated AISI 4140 Steel, Wear, 249, p. 254-259, 2001.
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[13]. Haasen P., Physical metallurgy. Cambridge, New York: Cambridge University Press, 1978.
[14]. Samuel J., Introduction to materials science course manual, Madison, Wisconsin: University of Wisconsin-Madison, 2009.
[15]. Leslie W. C., The physical metallurgy of steels, Washington: Hempisphere Pub. Corp., New York: McGraw-Hill, ISBN 0070377804, 1981.
[16]. Chinn R. L., Hardness, bearings, and the Rockwells, Advanced Materials & Processes, 167 (10), p. 29-31, 2009.
[17]. Davis J. R., Surface hardening of steels: Understanding the basics, Materials Park, OH: ASM International, 2002.
[18]. Dieter George E., Mechanical Metallurgy, SI Metric Adaptation, Maidenhead, UK: McGraw-Hill Education, ISBN 0-07-100406-8, 1989.
[19]. Revankar G., Introduction to hardness testing, Mechanical testing and evaluation, ASM Online, vol. 8, 2003.
Published
2021-03-15
How to Cite
1.
MECHKAROVA T, ARGIROV Y, SPASOVA D, STOYANOVA A. Structural Changes of Nitrogen Ferrite After Aging in Temperature Interval up to 100 °С. The Annals of “Dunarea de Jos” University of Galati. Fascicle IX, Metallurgy and Materials Science [Internet]. 15Mar.2021 [cited 30Oct.2024];44(1):28-3. Available from: https://gup.ugal.ro/ugaljournals/index.php/mms/article/view/4319
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