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http://dx.doi.org/10.12656/jksht.2021.34.1.1

Analysis on Temper Embrittlement and Metastable Phase of Martensitic Stainless Steel  

Lee, Gil Jae (Power Generation Technologies Development Institute, Korea East-West Power)
Choe, Byung Hak (Department of Metal and Materials Engineering, Gangneung-wonju National University)
Kim, Jae Hoon (School of Mechanical Engineering, Chungnam National University)
Publication Information
Journal of the Korean Society for Heat Treatment / v.34, no.1, 2021 , pp. 1-9 More about this Journal
Abstract
The martensitic stainless steel has excellent corrosion resistance and higher strength by quenching and tempering heat treatment. It has been widely used as blade material due to these properties. The hardness and impact toughness of martensitic stainless steel depended strongly on tempering temperatures. The 12Cr martensite stainless steel (SS 410) tempered about 540℃ showed temper embrittlement. To know cause of temper embrittlement in terms of phase identification, a detailed analysis of electron diffraction patterns during TEM observations has been carried out on the <110>α-Fe and <113>α-Fe zone axes for temper embrittlement specimen. The double electron diffraction spots at 1/3(211) and 2/3(211) positions were observed. The lattice space between individual diffraction spots was about 3.5 Å and this value coincide with three times to α-bcc lattice space (1.17 Å). The area which found double diffraction spots was judged metastable "zone" similar to the omega phase and induced embrittlement of SS410 material.
Keywords
Metastable phase; Tempered martensite; Temper embrittlement; Omega phase; Twinning;
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