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- Title
Microhardness Variation with Indentation Depth for Body-Centered Cubic Steels Pertinent to Grain Size and Ferrite Content.
- Authors
Xu, Anye; Song, Xuding; Ye, Min; Wan, Yipin; Zhang, Chunguo
- Abstract
For a micro-indentation hardness test with non-destructivity, the Nix–Gao model is widely used to describe tested hardness or microhardness variation with an indentation depth induced by indentation size effect, in which tested hardness approaches the macrohardness when the indentation depth is large enough. Based on an analysis of hardness measurements on 10 body-centered cubic steels with diverse microstructure, this paper proposes an analytical relation between microhardness to macrohardness ratio and the indentation depth by explicitly linking characteristic indentation depth (a data-fitting parameter) to grain size and ferrite volume fraction using two different methods. In addition, the normal distribution theory is incorporated to consider the inevitable scatter of identical measurements resulting from material heterogeneity and machining/testing errors. Results show that the proposed model, with 96% reliability, can effectively predict microhardness variation with the indentation depth and its scatter.
- Subjects
BODY centered cubic structure; MICROHARDNESS; FERRITES; HARDNESS testing; GAUSSIAN distribution; GRAIN size
- Publication
Materials (1996-1944), 2024, Vol 17, Issue 10, p2371
- ISSN
1996-1944
- Publication type
Article
- DOI
10.3390/ma17102371