Effect of Si content on the microstructure and mechanical properties of 9Cr-ferritic/martensitic steels

G.J. Zhang; Y. Zhou; J.F. Yang; H.Y. Yang; M.M. Wang; K. Jing; Z.M. Xie; L.C. Zhang; R. Liu; G. Li; H. Wang; L. Li; Q.F. Fang; X.P. Wang

Nuclear Materials and Energy (Jun 2023)

Effect of Si content on the microstructure and mechanical properties of 9Cr-ferritic/martensitic steels

G.J. Zhang,
Y. Zhou,
J.F. Yang,
H.Y. Yang,
M.M. Wang,
K. Jing,
Z.M. Xie,
L.C. Zhang,
R. Liu,
G. Li,
H. Wang,
L. Li,
Q.F. Fang,
X.P. Wang

Affiliations

G.J. Zhang: Key Laboratory of Materials Physic, Institute of Solid State Physics, Hefei Institute of Physical Sciences, Chinese Academy of Sciences, Hefei 230031, China; Department of Materials Science and Engineering, University of Science and Technology of China, Hefei 230026, China
Y. Zhou: Key Laboratory of Materials Physic, Institute of Solid State Physics, Hefei Institute of Physical Sciences, Chinese Academy of Sciences, Hefei 230031, China; Institutes of Physical Science and Information Technology, Anhui University, Hefei 230601, China
J.F. Yang: Key Laboratory of Materials Physic, Institute of Solid State Physics, Hefei Institute of Physical Sciences, Chinese Academy of Sciences, Hefei 230031, China; Lu an Branch, Anhui Institute of Innovation for Industrial Technology, Lu’an 237100, China; Corresponding authors at: Key Laboratory of Materials Physics, Institute of Solid state Physics, Chinese Academy of Sciences, Hefei 230031, China.
H.Y. Yang: Key Laboratory of Materials Physic, Institute of Solid State Physics, Hefei Institute of Physical Sciences, Chinese Academy of Sciences, Hefei 230031, China
M.M. Wang: Key Laboratory of Materials Physic, Institute of Solid State Physics, Hefei Institute of Physical Sciences, Chinese Academy of Sciences, Hefei 230031, China; Department of Materials Science and Engineering, University of Science and Technology of China, Hefei 230026, China
K. Jing: Key Laboratory of Materials Physic, Institute of Solid State Physics, Hefei Institute of Physical Sciences, Chinese Academy of Sciences, Hefei 230031, China; Department of Materials Science and Engineering, University of Science and Technology of China, Hefei 230026, China
Z.M. Xie: Key Laboratory of Materials Physic, Institute of Solid State Physics, Hefei Institute of Physical Sciences, Chinese Academy of Sciences, Hefei 230031, China
L.C. Zhang: Key Laboratory of Materials Physic, Institute of Solid State Physics, Hefei Institute of Physical Sciences, Chinese Academy of Sciences, Hefei 230031, China
R. Liu: Key Laboratory of Materials Physic, Institute of Solid State Physics, Hefei Institute of Physical Sciences, Chinese Academy of Sciences, Hefei 230031, China
G. Li: Science and Technology on Reactor Fuel and Materials Laboratory, Nuclear Power Institute of China, Chengdu 610041, China
H. Wang: School of Mechanical Engineering, Chengdu University, Chengdu 610106, China
L. Li: Key Laboratory of Materials Physic, Institute of Solid State Physics, Hefei Institute of Physical Sciences, Chinese Academy of Sciences, Hefei 230031, China; Department of Materials Science and Engineering, University of Science and Technology of China, Hefei 230026, China
Q.F. Fang: Key Laboratory of Materials Physic, Institute of Solid State Physics, Hefei Institute of Physical Sciences, Chinese Academy of Sciences, Hefei 230031, China
X.P. Wang: Key Laboratory of Materials Physic, Institute of Solid State Physics, Hefei Institute of Physical Sciences, Chinese Academy of Sciences, Hefei 230031, China; Corresponding authors at: Key Laboratory of Materials Physics, Institute of Solid state Physics, Chinese Academy of Sciences, Hefei 230031, China.

Journal volume & issue: Vol. 35
p. 101428

Abstract

Read online

9Cr-F/M−xSi (x = 0–1.0 wt%) steels were fabricated through vacuum induction melting technique and processed by hot forging, hot rolling, normalizing and tempering, subsequently. Their microstructure and mechanical properties were characterized using OM, SEM, TEM, Vickers hardness tester and tensile tester. The steel has a typical ferrite/martensitic structure, with M23C6 and MX phases precipitated at the martensite lath boundary or in the lath. With Si content increasing, the average ultimate tensile strength (UTS) and hardness of 9Cr-F/M−xSi increase simultaneously from 678 MPa and 235 HV for 9Cr-F/M−0Si steel to 788 MPa and 265 HV for 9Cr-F/M−1.0Si steel, respectively, while the total elongation kept almost constant at 22.5%. The main strengthening mechanism is the solid solution strengthening due to silicon addition and the change in the carbide precipitation behavior caused no remarkable hardening contribution. These results can provide a reference for the composition design of structural materials for nuclear reactors.

Published in Nuclear Materials and Energy

ISSN: 2352-1791 (Online)
Publisher: Elsevier
Country of publisher: United Kingdom
LCC subjects: Technology: Electrical engineering. Electronics. Nuclear engineering: Nuclear engineering. Atomic power
Website: http://www.journals.elsevier.com/nuclear-materials-and-energy/

About the journal

Abstract

Keywords