Influence of Fabrication Route and Copper Content on Nature and Kinetics of 475 °C- Embrittlement in Cu-Containing Super Duplex Stainless Steels
Artikel i vetenskaplig tidskrift, 2023

The influence of hot-rolling, hot isostatic pressing (HIP), welding, as well as copper content on 475 °C-embrittlement is studied in super duplex stainless steels. The as-received samples are solution annealed and quenched. Then, to study the kinetics and nature of phase transformations during fabrication, the samples are aged for a very short duration of 5 min at 475 °C. Atom probe tomography results reveal that the processes involving more plastic deformation such as hot rolling and HIP accelerate chromium and iron phase separation and cause precipitation of copper-rich particles (CRPs) in ferrite, resulting in significant toughness loss. In contrast, the weld does not show a high level of chromium and iron phase separation or CRPs precipitation, preserving its toughness after the short aging. The experiment and the inverse interdiffusion calculations reveal that raising the copper content slow down chromium and iron phase separation but significantly increase the CRP number density and decrease the toughness of the HIPed material. Precipitation simulation of CPRs show that the model must be modified based on each processing condition. It is concluded that hot rolling and HIP accelerate 475 °C-embrittlement, which cannot be prevented by raising the copper content.

475 °C- embrittlement

simulations

super duplex stainless steels

Cu-rich particle precipitation

Fe and Cr phase separation

Författare

Vahid A. Hosseini

Högskolan Väst

ESAB

Mattias Thuvander

Chalmers, Fysik, Mikrostrukturfysik

Kristina Lindgren

Chalmers, Fysik, Mikrostrukturfysik

James Oliver

Outokumpu Stainless Research Foundation

Nicklas Folkeson

ESAB

Daniel Gonzalez

Bodycote

Sezgin Cengiz

Gebze Teknik Üniversitesi (GYTE)

Chalmers, Fysik, Mikrostrukturfysik

Leif Karlsson

Högskolan Väst

Steel Research International

1611-3683 (ISSN) 1869344x (eISSN)

Vol. 94 12 2200978

Ämneskategorier

Bearbetnings-, yt- och fogningsteknik

Annan materialteknik

Metallurgi och metalliska material

DOI

10.1002/srin.202200978

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Senast uppdaterat

2024-03-07