[Kovove materialy - Metallic materials]
    Mon - January 25, 2021 - 15:04 No. of hits : 1227840 ISSN 1338-4252 (online) ISSN 0023-432X (printed)
© Institute of Materials and Machine Mechanics, Slovak Academy of Sciences, Bratislava, Slovak Republic

VOLUME 58 (2020), Issue 4

Measurement of martensitic packet size by EBSD in the high strength steel X38CrMoV5-1 and estimation of its influence on cleavage fracture
vol. 58 (2020), no. 4, pp. 267 - 273

The crystallographic packet or microstructural unit was determined with 15° and 5° boundary grain misorientations in a quenched and tempered X38CrMoV5-1 steel, yielding results of 0.68 and 0.59 μm, respectively. Though both values are similar, the latter has been taken as the best to calculate the effective surface energy of cleavage fracture, γp, leading to a value of 15.8 J m–2. Thus it is demonstrated that the microstructural unit controlling crack propagation is that determined by EBSD with a 5° misorientation angle. Other structural parameters, like the parent austenite grain size and the morphological martensitic packet, have been ruled out.

Key words
EBSD, crack growth, fracture toughness, precipitation, steel

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Full title of this journal is bilingual: Kovové materiály - Metallic Materials.
The official abbreviation in accordance with JCR ISI is Kovove Mater.

Article abstracts updated: 2021-01-15 08:18      
Articles in press revised: 2020-10-30 12:09     
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