Microstructure and creep behaviour of P92 steel after HPT

0489151 - ÚFM 2019 RIV CH eng J - Journal Article
Král, Petr - Dvořák, Jiří - Sklenička, Václav - Masuda, T. - Horita, Z. - Kuchařová, Květa - Kvapilová, Marie - Svobodová, M.
Microstructure and creep behaviour of P92 steel after HPT.
Materials Science and Engineering A Structural Materials Properties Microstructure and Processing. Roč. 723, APR (2018), s. 287-295. ISSN 0921-5093. E-ISSN 1873-4936
R&D Projects: GA ČR(CZ) GA16-09518S
Institutional support: RVO:68081723
Keywords : Creep-resistant 9%Cr steels * Ultrafine grained materials * Creep * EBSD
OECD category: Materials engineering
Impact factor: 4.081, year: 2018
Method of publishing: Limited access
https://www.sciencedirect.com/science/article/pii/S0921509318304088?via%3Dihub

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 ultrafinegrained
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.
Permanent Link: http://hdl.handle.net/11104/0286677