A New Approach for Studying Mechanical Properties of Thin Surface Layers Affected by Manufacturing Processes  

Oleh:

Kompella, S. ; Farris, T. N. ; Moylan, S. P.

Jenis: Article from Journal - ilmiah internasional
Dalam koleksi: Journal of Manufacturing Science and Engineering vol. 125 no. 2 (May 2003), page 310-315.
Topik: MANUFACTURING; studying; mechanical properties; thin surface layers; manufacturing

Ketersediaan

Perpustakaan Pusat (Semanggi) Nomor Panggil: JJ93.4 Non-tandon: 1 (dapat dipinjam: 0) Tandon: tidak ada

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Isi artikel

Nano - indentation has become an import ant tool in the study of mechanical properties of solids at small length scales, ever since its formulation as a technique in the early 1980s. The small size of an indentation, typically one micrometer or less in surface extent, makes it a potentially attractive tool also for the quantitative study of the characteristics of surface layers in monolithic solids. Here, we report results from a study in which nano-indentation has been combined with taper - sectioning to analyze the mechanical properties of thin surface layers affected by manufacturing processes. The so - called white etching layer (WL) produced in steel surfaces by machining and abrasion is characterized. The WL is found to have a hardness in the range of 11.5 – 16.2 GPa, which is significantly greater than that of untempered martensite produced by heat treatment processes. These hardness values are close to those measured on steel piano wires. The so - called "burn - layer" produced on ground surfaces of steels is found to have a hardness distribution very similar to that of a white layer, suggesting that the two layers are of the same type. Localized hardening and softening of surface layers, over spatial extents of a few micro - meters, caused by material removal processes are accurately resolved by the combined use of nano - indentation and taper - sectioning. The taper - sectioning / nano - indentation approach is also shown to be a good procedure for characterizing the hardness of PVD - TiN films deposited onto hard metal substrates.

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