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http://dx.doi.org/10.12656/jksht.2021.34.4.179

The Effect of Ausforming Process on Mechanical Properties of Ultrahigh Strength Secondary Hardening Martensitic Steels  

Kim, S.B. (School of Advanced Materials Engineering, Kookmin University)
Won, Y.J. (School of Advanced Materials Engineering, Kookmin University)
Song, Y.B. (Agency for Defense Development)
Cho, K.S. (School of Advanced Materials Engineering, Kookmin University)
Publication Information
Journal of the Korean Society for Heat Treatment / v.34, no.4, 2021 , pp. 179-184 More about this Journal
Abstract
Two types of secondary hardening martensitic steels, 10Co-14Ni and 6Co-5Ni, were produced by vacuum induction melting to investigate the effect of ausforming process on mechanical properties. According to the results of present study, the alloy samples ausformed at low temperature indicated a rather low hardness level in overall aging time despite the refinement of martensite lath width. As the result can closely be related with the presence of primary carbides precipitated within the initial austenite matrix, we confirmed that, in ultrahigh strength secondary hardening martensitic alloy steels, the ausforming process can rather limit the degree of secondary hardening during the subsequent aging treatment.
Keywords
martensitic steels; secondary hardening; ausforming; primary and secondary carbides;
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