(Received 25 October 2013; accepted 12 February 2014)
Published Online: 22 January 2015
CODEN: JTEVAB
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A Cr3C2–NiCr coating with a thickness of 200 μm was deposited on an AISI 1045 steel substrate using a supersonic plasma-spray technique. The hardness of the Cr3C2–NiCr coating was characterized by a nano-indenter equipped with an atomic force microscope (AFM). The AFM images indicated that the nano-indents on the Cr3C2–NiCr coating exhibited significant “pile-up” deformation. Such pile-up behavior needs to be taken into account in hardness determination because the pile-up height accounts for a large proportion of the indentation depth. In this paper, four different methods are compared to determine the hardness of the Cr3C2–NiCr coating: the Oliver–Pharr method, two work-of-indentation methods (total work of indentation and plastic work of indentation), and an AFM analysis method. The results show that the Oliver–Pharr and work-of-indentation methods overestimated the hardness, and the AFM analysis method is considered as a more accurate method for determining the hardness of the Cr3C2–NiCr coating.
Author Information:
Zhu, Li-na
School of Engineering and Technology, China Univ. of Geosciences, Beijing,
Xu, Bin-shi
National Key Lab for Remanufacturing, Academy of Armored Forces Engineering, Beijing,
Wang, Hai-dou
School of Engineering and Technology, China Univ. of Geosciences, Beijing,
Wang, Cheng-biao
School of Engineering and Technology, China Univ. of Geosciences, Beijing,
Stock #: JTE20130278
ISSN:0090-3973
DOI: 10.1520/JTE20130278
Author