Abstract
This paper presents an analysis of in-process liquid nitrogen cryogenic cooling on the generation of nanocrystalline workpiece (AISI4140) surface layer in machining. Samples from cryogenic machining demonstrate nanocrystalline grain refinement with beneficial properties, e.g., favorable wear characteristics. Correlations are established among process and geometry parameters, cooling conditions, cutting forces and surface layer states. Parameters studied are cooling state, depth of cut h and cutting edge radius rβ. Cutting forces are measured and a detailed analysis of micro/nano-structural surface layer conditions was carried out using Focused Ion Beam system, Atomic Force Microscopy and Nanoindentation. It is shown that the obtained micro/nanostructure strongly depends on the cooling conditions. In particular, the affected depth is influenced by the cooling state.
| Original language | English |
|---|---|
| Pages (from-to) | 169-174 |
| Number of pages | 6 |
| Journal | Procedia CIRP |
| Volume | 13 |
| DOIs | |
| State | Published - 2014 |
| Event | 2nd CIRP Conference on Surface Integrity, CSI 2014 - Nottingham, United Kingdom Duration: May 28 2014 → May 30 2014 |
Bibliographical note
Funding Information:The authors gratefully thank the Institute for Sustainable Manufacturing (ISM) at the University of Kentucky for their support for this research work. The authors also would like to acknowledge Dr. John Balk and Julius Schoop for their help in experimental work and analysis of results.
Keywords
- Cryogenic machining
- Grain size
- Surface integrity
ASJC Scopus subject areas
- Control and Systems Engineering
- Industrial and Manufacturing Engineering