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http://dx.doi.org/10.12656/jksht.2021.34.6.294

Effects of Long-term Heat treatment on Mechanical Softening of Mn-Mo-Ni Low-Alloy Steel  

Kim, Minsuk (Department of Materials Science and Engineering, Chosun University)
Kim, Chungseok (Department of Materials Science and Engineering, Chosun University)
Publication Information
Journal of the Korean Society for Heat Treatment / v.34, no.6, 2021 , pp. 294-301 More about this Journal
Abstract
In the present study, we investigate the effects of long-term heat treatment at elevated temperatures on the mechanical softening of the Mn-Mo-Ni low-alloy steel. The influence of long-term heat treatment on microstructure and mechanical strength was evaluated. To simulate the long-term material degradation, heat treatment test was interrupted at several stages up to 10,000 hours in an electric furnace. The Mn-Mo-Ni low-alloy steel shows a typical bainitic phase, which consists of a well-developed lath substructure with fine precipitates along the lath boundaries. However, these fine precipitates were redissolved into the matrix with long-term heat treatment, and then the lath substructures were recovered. Consequently, ultimate tensile strength and yield strength decreased during long-term heat treatment showing a mechanical softening phenomenon.
Keywords
Low-alloy steel; Mn-Mo-Ni; Mechanical softening; Long-term heat treatment;
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Times Cited By KSCI : 1  (Citation Analysis)
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