TY - JOUR
T1 - Microstructure and creep behaviour of P92 steel after HPT
AU - Kral, Petr
AU - Dvorak, Jiri
AU - Sklenicka, Vaclav
AU - Masuda, Takahiro
AU - Horita, Zenji
AU - Kucharova, Kveta
AU - Kvapilova, Marie
AU - Svobodova, Marie
N1 - Funding Information:
We acknowledge financial support for this work from the Czech Science Foundation under project no. 16-09518S. This work was also supported by a Grant-in-Aid from MEXT, Japan , for Scientific Research (S (No. 26220909 )). The HPT process was carried out at the International Research Centre on Giant Straining for Advanced Materials (IRC-GSAM) at Kyushu University, Japan.
Publisher Copyright:
© 2018 Elsevier B.V.
PY - 2018/4/18
Y1 - 2018/4/18
N2 - The influence of the application of severe plastic deformation on microstructure changes and creep deformation behaviour was investigated in P92 creep-resistant pipe steel. P92 steel in its as-received state, with a microstructure typical of tempered martensite, was subjected to high-pressure torsion at room temperature. An investigation of the microstructure using an electron backscatter diffraction technique revealed that severe plastic deformation led to the subsequent formation of an ultrafine-grained microstructure, containing {110} fibre texture and randomly misoriented boundaries. The microstructure characteristics and hardness measurements exhibited saturated values at an equivalent strain of higher than about 20. The creep behaviour of the ultrafine-grained specimen produced in the saturated region exhibited a minimum creep rate that was about two orders of magnitude faster, and a larger creep ductility, in comparison with the as-received state. Creep exposure at 873 K with a time to fracture of about 3 h led to a slight grain coarsening and to the formation of Laves phase.
AB - The influence of the application of severe plastic deformation on microstructure changes and creep deformation behaviour was investigated in P92 creep-resistant pipe steel. P92 steel in its as-received state, with a microstructure typical of tempered martensite, was subjected to high-pressure torsion at room temperature. An investigation of the microstructure using an electron backscatter diffraction technique revealed that severe plastic deformation led to the subsequent formation of an ultrafine-grained microstructure, containing {110} fibre texture and randomly misoriented boundaries. The microstructure characteristics and hardness measurements exhibited saturated values at an equivalent strain of higher than about 20. The creep behaviour of the ultrafine-grained specimen produced in the saturated region exhibited a minimum creep rate that was about two orders of magnitude faster, and a larger creep ductility, in comparison with the as-received state. Creep exposure at 873 K with a time to fracture of about 3 h led to a slight grain coarsening and to the formation of Laves phase.
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U2 - 10.1016/j.msea.2018.03.059
DO - 10.1016/j.msea.2018.03.059
M3 - Article
AN - SCOPUS:85044117223
SN - 0921-5093
VL - 723
SP - 287
EP - 295
JO - Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing
JF - Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing
ER -