Studying the structure of films generated on HSS-based deformed powder materials cutting tool surface
✍ Scribed by A.I Kovalev; G.S Fox-Rabinovich; D.L Wainstein; V.P Mishina
- Publisher
- Elsevier Science
- Year
- 2000
- Tongue
- English
- Weight
- 572 KB
- Volume
- 238
- Category
- Article
- ISSN
- 0043-1648
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✦ Synopsis
Cutting tools made of high-speed steel based deformed composite powder materials HSS-based DCPM are known to develop Ž . oxygen-containing films, the so-called ''secondary structures'' SS , during the cutting operation. Composition, nearest atomic surrounding, and electron structure of these films were investigated by means of SEM, AES, ELS, and EELFS methods. It was found that Ž . structural features of these films differ from those of TiC, TiO rutile , and of the films developed on the surface of the TiC-powder 2 Ž . heated in atmosphere. Lack of order in the arrangement of atoms at remote interatomic distances beyond the third co-ordination sphere and low localisation of p-electrons give grounds for inferring the amorphous-like structure of the films. Causes that underlay the development of such formations are discussed in terms of thermodynamics of non-equilibrium processes. Evolution of the atomic structure of DCPM-tools at friction was revealed. It was discovered that favourable frictional properties and high wear resistance of DCPM-tools are determined by developing SSs. Such structures are represented by the oversaturated solid solution of oxygen in titanium. High operational properties of DCPM result, among other things, from metal-type attributes of developing films.