Evidence of austenite memory in PH 15-5 and assessment of its formation mechanism
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in: Materials and Design, Jahrgang 176.2019, Nr. August, 107841, 15.08.2019.
Publikationen: Beitrag in Fachzeitschrift › Artikel › Forschung › (peer-reviewed)
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TY - JOUR
T1 - Evidence of austenite memory in PH 15-5 and assessment of its formation mechanism
AU - Brandl, Dominik Christian
AU - Lukas, Marina
AU - Stockinger, Martin
AU - Ploberger, Sarah
AU - Ressel, Gerald
PY - 2019/8/15
Y1 - 2019/8/15
N2 - Austenite memory and subsequent spontaneous recrystallization during austenitization is stated for some types of soft martensitic stainless steels such as X4CrNiMo16-5-1 or 13Crsingle bond5Ni but have not been proposed for the commercial alloy PH15-5 until now. However, the understanding of the austenitization behavior is defined to be crucial as it influences grain size, dislocation density of austenite and thus the final mechanical properties of the material.Therefore, this study investigates the austenitization behavior of PH15-5 by means of in-situ high temperature electron back scatter diffraction of continuous austenitization and directly evidences austenite memory also in this alloy. In order to characterize the austenite formation mechanism in detail, dilatometer, in-situ X-ray diffraction and confocal laser scanning microscope experiments have been carried out. Corroborated with thermokinetic DICTRA simulations, a diffusion controlled transformation exhibiting austenite memory is evidenced. The in-situ high temperature electron backscatter diffraction data in comparison with recent literature indicates the inheritance of geometrically necessary dislocations from martensite to austenite. Therefore, a basic model is postulated in order to describe the inheritance of geometrically necessary dislocations due to a diffusion controlled transformation process.
AB - Austenite memory and subsequent spontaneous recrystallization during austenitization is stated for some types of soft martensitic stainless steels such as X4CrNiMo16-5-1 or 13Crsingle bond5Ni but have not been proposed for the commercial alloy PH15-5 until now. However, the understanding of the austenitization behavior is defined to be crucial as it influences grain size, dislocation density of austenite and thus the final mechanical properties of the material.Therefore, this study investigates the austenitization behavior of PH15-5 by means of in-situ high temperature electron back scatter diffraction of continuous austenitization and directly evidences austenite memory also in this alloy. In order to characterize the austenite formation mechanism in detail, dilatometer, in-situ X-ray diffraction and confocal laser scanning microscope experiments have been carried out. Corroborated with thermokinetic DICTRA simulations, a diffusion controlled transformation exhibiting austenite memory is evidenced. The in-situ high temperature electron backscatter diffraction data in comparison with recent literature indicates the inheritance of geometrically necessary dislocations from martensite to austenite. Therefore, a basic model is postulated in order to describe the inheritance of geometrically necessary dislocations due to a diffusion controlled transformation process.
KW - Austenite memory
KW - High temperature electron backscatter diffraction
KW - In-situ characterization
KW - Phase transformation
KW - Reversed austenite
KW - Supermartensitic stainless steel
KW - Supermartensitic stainless steelAustenite memoryReversed austenitePhase transformationIn-situ characterizationHigh temperature electron backscatter diffraction
UR - http://www.scopus.com/inward/record.url?scp=85065523057&partnerID=8YFLogxK
U2 - 10.1016/j.matdes.2019.107841
DO - 10.1016/j.matdes.2019.107841
M3 - Article
AN - SCOPUS:85065523057
VL - 176.2019
JO - Materials and Design
JF - Materials and Design
SN - 0264-1275
IS - August
M1 - 107841
ER -