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Mechanical properties of thermally-stable, nanocrystalline bainitic steels
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Materials Processing. University Of Cambridge. (Powder Metallurgy)ORCID iD: 0000-0002-6339-4612
2017 (English)In: Materials Science & Engineering: A, ISSN 0921-5093, E-ISSN 1873-4936, Vol. 700, p. 714-720Article in journal (Refereed) Published
Abstract [en]

Two novel, thermally stable bulk nanocrystalline bainitic steels were subjected to a range of mechanical tests. One alloy, containing 0.72 wt% carbon exhibited an ambient-temperature 0.2% proof strength of 1500 MPa and a fracture toughness of 64.6 MPa m<sup>1/2</sup> after the bainite transformation. The other, containing 0.45 wt% carbon and 13.2 wt% nickel, had a 0.2% proof stress of 1000 MPa and a fracture toughness of 103.8 MPa m<sup>1/2</sup> . Both steels showed excellent creep resistance, with a rupture life at 450 ˚C and 700 MPa of 114 h and 94.8 h, respectively. Both displayed fatigue lives consistent with other steels of similar structure in the literature. After thermal exposure at 480 ˚C for 8 d, both steels increased in strength to 1800 MPa, and 1600 MPa, respectively. The latter steel reduced in fracture toughness to 19.6 MPa m<sup>1/2</sup> . These alloys are suitable for a range of engineering applications and remain so after thermal exposure. Combined with impressive high-temperature performance, this

Place, publisher, year, edition, pages
2017. Vol. 700, p. 714-720
National Category
Metallurgy and Metallic Materials
Research subject
Materials Science and Engineering
Identifiers
URN: urn:nbn:se:kth:diva-227671DOI: 10.1016/j.msea.2017.04.110OAI: oai:DiVA.org:kth-227671DiVA, id: diva2:1205129
Available from: 2018-05-10 Created: 2018-05-10 Last updated: 2018-05-10

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