Nanoscale phase separations in as-fabricated thick super duplex stainless steels
Journal article, 2021

Nanoscale phase separations, and effects of these, were studied for thick super duplex stainless steel products by atom probe tomography and mechanical testing. Although nanoscale phase separations typically occur during long-time service at intermediate temperatures (300–500° C, our results show that slowly cooled products start to develop Fe and Cr separation and/or precipitation of Cu-rich particles already during fabrication. Copper significantly slowed down the kinetics at the expense of Cu-rich particle precipitation, where the high-copper material subjected to hot isostatic pressing (HIP), with Δt of 160 s and the low-copper hot-rolled plate with Δt of 2 s had the same level of Fe and Cr separation. The phase separations resulted in lower toughness and higher hardness of the HIP material than for hot-rolled plate. Therefore, both local cooling rate dependent and alloy composition governed variations of phase separations can be expected in as-fabricated condition.

Author

Vahid A. Hosseini

University West

Kristina Lindgren

Chalmers, Physics, Microstructure Physics

Mattias Thuvander

Chalmers, Physics, Microstructure Physics

Daniel Gonzalez

Bodycote

James Oliver

Outokumpu AB

Leif Karlsson

University West

Journal of Materials Science

0022-2461 (ISSN) 1573-4803 (eISSN)

Vol. 56 21 12475-12485

Subject Categories

Other Chemistry Topics

Metallurgy and Metallic Materials

Corrosion Engineering

DOI

10.1007/s10853-021-06056-0

More information

Latest update

6/28/2021