Journal Published Online: 10 October 2014
Volume 43, Issue 1

Comparison of Four Different Methods to Determine the Hardness of Plasma-sprayed Cr C –NiCr Coating by Nano-indentation

CODEN: JTEVAB

Abstract

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, CN National Key Lab for Remanufacturing, Academy of Armored Forces Engineering, Beijing, CN
Xu, Bin-shi
National Key Lab for Remanufacturing, Academy of Armored Forces Engineering, Beijing, CN
Wang, Hai-dou
School of Engineering and Technology, China Univ. of Geosciences, Beijing, CN School of Engineering and Technology, China Univ. of Geosciences, Beijing, CN
Wang, Cheng-biao
School of Engineering and Technology, China Univ. of Geosciences, Beijing, CN
Pages: 7
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Details
Stock #: JTE20130278
ISSN: 0090-3973
DOI: 10.1520/JTE20130278