Mechanical properties of thermally-stable, nanocrystalline bainitic steels

Two novel, thermally stable bulk nanocrystalline bainitic steels were subjected to a range of mechanical tests. One alloy, containing 0.72wt% carbon exhibited an ambient-temperature 0.2% proof strength of 1500MPa and a fracture toughness of 64.6MPa m12 after the bainite transformation. The other, co...

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Bibliographic Details
Published in:Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 2017-07, Vol.700, p.714-720
Main Authors: Hulme-Smith, C.N., Bhadeshia, H.K.D.H.
Format: Article
Language:English
Subjects:
Bainite
Creep strength
Fatigue life
Fracture toughness
High temperature
Materials Science and Engineering
Mechanical characterization
Mechanical properties
Mechanical tests
Nanocrystals
Nanostructured materials
Nickel alloys
Proof stress
Steel structures
Teknisk materialvetenskap
Thermal stability
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Summary:Two novel, thermally stable bulk nanocrystalline bainitic steels were subjected to a range of mechanical tests. One alloy, containing 0.72wt% carbon exhibited an ambient-temperature 0.2% proof strength of 1500MPa and a fracture toughness of 64.6MPa m12 after the bainite transformation. The other, containing 0.45wt% carbon and 13.2wt% nickel, had a 0.2% proof stress of 1000MPa and a fracture toughness of 103.8MPam12. Both steels showed excellent creep resistance, with a rupture life at 450°C and 700MPa of 114h and 94.8h, respectively. Both displayed fatigue lives consistent with other steels of similar structure in the literature. After thermal exposure at 480°C for 8d, both steels increased in strength to 1800MPa, and 1600MPa, respectively. The latter steel reduced in fracture toughness to 19.6MPam12. These alloys are suitable for a range of engineering applications and remain so after thermal exposure. Combined with impressive high-temperature performance, this makes the current alloys candidates for use in some elevated temperature applications.
ISSN:0921-5093
1873-4936
1873-4936
DOI:10.1016/j.msea.2017.04.110