TY - JOUR
T1 - Phase evolution within multiphase stainless steels during simulated hot isostatic pressing cycles
AU - Bowden, D.
AU - Stewart, D.
AU - Preuss, M.
N1 - Funding Information:
Thanks to the staff on beamline ID22 at the European Synchrotron Radiation Facility (ESRF), Grenoble, France and beamline I11 at Diamond Light Source (DLS), Didcot, UK for providing the equipment, beam time and support for these experiments; particularly Dr. A. Fitch, Dr. C. Giacobbe, Prof. C. Tang and Dr. S. Thompson. Thanks to Dr. I. Bhamji, Dr. S. Irukuvarghula, Dr. P. B. R. Rajan and Dr. J. Ward for their assistance during these experiments. The author also wishes to thank Dr. L. Benson from the University of Sheffield for assistance with producing the initial RR2450 phase diagram in Thermocalc. The authors wish to thank Rolls-Royce plc. and the Engineering and Physical Sciences Research Council (EPSRC) for financial support provided through the Advanced Metallic Systems Centre for Doctoral Training. Professor M. Preuss also acknowledges his EPSRC Leadership Fellowship support (EP/I005420/1) and the EPSRC NNUMAN Programme Grant (EP/J021172/1). Dr. Bowden and Professor Preuss acknowledge additional EPSRC funding (EP/R000956/1).
Funding Information:
The authors wish to thank Rolls-Royce plc. and the Engineering and Physical Sciences Research Council (EPSRC) for financial support provided through the Advanced Metallic Systems Centre for Doctoral Training. Professor M. Preuss also acknowledges his EPSRC Leadership Fellowship support ( EP/I005420/1 ) and the EPSRC NNUMAN Programme Grant ( EP/J021172/1 ). Dr. Bowden and Professor Preuss acknowledge additional EPSRC funding (EP/R000956/1).
Publisher Copyright:
© 2022
PY - 2022/5
Y1 - 2022/5
N2 - Stainless steel hardfacing alloys are being developed for wear and corrosion resistant applications in pressurised water reactor environments. Two examples of this, the austenitic Tristelle 5183 and triplex RR2450 were produced by gas-atomisation before undergoing consolidation using hot isostatic pressing. The phase evolution of these alloys during simulated hot isostatic pressing cycles was observed in-situ, using synchrotron X-ray diffraction. During these cycles, the metastability of the gas-atomised powders is revealed, which influences the rate of high-temperature γ→δ transformation within the RR2450 alloy. Additionally, a high-strength silicide phase, named π-ferrosilicide, forms within these alloys. It decomposes by a eutectoid π→δ+M7C3 transformation, demonstrating a high carbon solubility within this phase. The observations of this study demonstrate the need to carefully consider the process parameters during hot isostatic pressing for such complex alloys, since alloy phase transformation rates are heavily influenced by the starting condition of the gas-atomised powder.
AB - Stainless steel hardfacing alloys are being developed for wear and corrosion resistant applications in pressurised water reactor environments. Two examples of this, the austenitic Tristelle 5183 and triplex RR2450 were produced by gas-atomisation before undergoing consolidation using hot isostatic pressing. The phase evolution of these alloys during simulated hot isostatic pressing cycles was observed in-situ, using synchrotron X-ray diffraction. During these cycles, the metastability of the gas-atomised powders is revealed, which influences the rate of high-temperature γ→δ transformation within the RR2450 alloy. Additionally, a high-strength silicide phase, named π-ferrosilicide, forms within these alloys. It decomposes by a eutectoid π→δ+M7C3 transformation, demonstrating a high carbon solubility within this phase. The observations of this study demonstrate the need to carefully consider the process parameters during hot isostatic pressing for such complex alloys, since alloy phase transformation rates are heavily influenced by the starting condition of the gas-atomised powder.
KW - Duplex stainless steel
KW - Hardfacing
KW - Multiphase
KW - Phase transformation
KW - Synchrotron diffraction
UR - https://www.scopus.com/pages/publications/85128319640
U2 - 10.1016/j.mtla.2022.101411
DO - 10.1016/j.mtla.2022.101411
M3 - Article
AN - SCOPUS:85128319640
SN - 2589-1529
VL - 22
JO - Materialia
JF - Materialia
M1 - 101411
ER -