Cryo-quenched Fe-Ni-Cr alloy decorative steel single crystals II: Alloy phases, structure, hardness, tensile, tribological, magnetic and electronic properties

JOURNAL OF ALLOYS AND COMPOUNDS

卷:835

Article

Boatner, Lynn A.¹  Chakoumakos, Bryan C.²  Pardhasaradhi, Sudharshan Phani³  Dryepondt, Sebastien N.¹  Shaw, Austin¹  Qu, Jun¹  Rossy, Andres E. Marquez¹  McGuire, Michael A.¹  Kolopus, James A.¹  Lara-Curzio, Edgar¹ 

[1] Oak Ridge Natl Lab, Mat Sci & Technol Div, Ridge, TN 37831 USA

[2] Oak Ridge Natl Lab, Neutron Scattering Sci Div, Ridge, TN 37831 USA

[3] Int Adv Res Ctr Powder Met & New Mat ARCI, Balapur PO, Hyderabad 500005, Telangana, India

关键词: Decorative steel;    Phase transitions;    Hardness;    Tribology;    Magnetism;   

DOI  :  10.1016/j.jallcom.2020.155169

来源: Elsevier

【 摘 要 】

We have previously reported (Boatner et al., J. Alloys Compd. 691 (2017) 666-671) on the discovery, formation, processing, and application of a new decorative ternary steel. alloy and on its use in a wide range of practical applications including: custom and commercial knives, art objects, jewelry, electronics, and furniture. This decorative property results when polished single crystals of the 70 wt%Fe-15 wt%Ni-15 wt% Cr austenitic alloy are cryo-quenched into the martensitic phase resulting in the formation of a three-dimensional raised pattern of mixed austenitic/martensitic laths. These laths propagate across large dimensions of the material due to the absence of grain boundaries in the single crystal. The macroscopic optically reflective 3-D decorative pattern reproduces the structural symmetry inherent in the single-crystal orientation. This pattern results solely from the metallurgical phase properties of the ternary alloy and is completely distinct from the properties of Damascus steels or more modern so-called pattern-welded steels. Here we use X-ray diffraction, nanoindentation, hardness measurements/scratch testing, tribological measurements, and alloy resistivity and magnetization methods to obtain a more fundamental and comprehensive study of the effects of the austenitic/martensitic phase transition on the structural and physical properties of the 70 wt%Fe-15 wt%Ni-15 wt% Cr alloy. These results reveal new insight into irreversible phenomena that are associated with the inhibited phase transition on heating of the two-phase, mixed austenitic/martensitic structure that is formed subsequent to cryo-quenching the alloy crystal to 77 K. (C) 2020 Elsevier B.V. All rights reserved.

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