CPL - Chalmers Publication Library
| Utbildning | Forskning | Styrkeområden | Om Chalmers | In English In English Ej inloggad.

Precipitation process of martensitic PH stainless steel Nanoflex

Mattias Thuvander (Institutionen för teknisk fysik, Mikroskopi och mikroanalys ; Institutionen för teknisk fysik, Materialens mikrostruktur ) ; Marcus Andersson (Institutionen för teknisk fysik, Mikroskopi och mikroanalys ; Institutionen för teknisk fysik, Materialens mikrostruktur ) ; Krystyna Stiller (Institutionen för teknisk fysik, Mikroskopi och mikroanalys ; Institutionen för teknisk fysik, Materialens mikrostruktur )
Materials Science and Technology (0267-0836). Vol. 28 (2012), 6, p. 695-701.
[Artikel, refereegranskad vetenskaplig]

The precipitation process of the martensitic PH stainless steel Nanoflex during aging at 475 degrees C has been investigated with atom probe tomography. The composition of the matrix and the nanosized precipitates has been determined after aging for 5 min, 4 h, 40 h and 100 h. Also, the number density of the various precipitated phases has been measured. It is shown that the precipitation process is rather complex and that different precipitate phases form in direct contact with each other. At the early stages two families of Ni rich precipitates, Ni-3(Ti, Al) and Ni-3(Ti, Al, Si), form on Cu rich precipitates. Later, Cr rich precipitates form on the Ni rich precipitates. Eventually the Ni-3(Ti, Al, Si) precipitates dissolve and are replaced by Ni16Si7Ti6. Precipitates rich in Mo, most probably the quasicrystalline R' phase, are also formed in direct contact with other precipitates. The identity of the precipitates is discussed further in the paper. Even though the number density of the precipitates decreases during aging, the hardness does not decrease. This can probably be explained by an increased total volume fraction of precipitates as additional phases appear during aging.

Nyckelord: Atom probe tomography, Aging, Precipitation, Stainless steels, transmission electron-microscopy, quasi-crystalline phase, maraging, steels, atom-probe, laves phase, fe-cr, duplex, alloy, ni, stability



Denna post skapades 2012-07-04. Senast ändrad 2014-09-02.
CPL Pubid: 160014

 

Läs direkt!


Länk till annan sajt (kan kräva inloggning)


Institutioner (Chalmers)

Institutionen för teknisk fysik, Mikroskopi och mikroanalys (2005-2012)
Institutionen för teknisk fysik, Materialens mikrostruktur (2012-2015)

Ämnesområden

Materialteknik

Chalmers infrastruktur