期刊
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
卷 8, 期 5, 页码 4347-4353出版社
ELSEVIER
DOI: 10.1016/j.jmrt.2019.07.045
关键词
Cryogenic machining; AISI 4340 alloy steel; Globular particle
资金
- Government of Malaysia
- Universiti Kebangsaan Malaysia [DIP-2018-026, GUP-2017-048]
Machining significantly influences surface integrity, metallurgical structure, grain size and thereby the mechanical, chemical and physical properties of the component. The presented investigation concentrates on grain refinement in turning of AISI 4340 alloy steel in dry and cryogenic turning. With cutting temperatures below 950 degrees C, the resulted surface layer consists of a microstructure with ultrafine white globular particles in all samples. A higher percentage of these particles was observed when using cryogenic flushing. It resulted in improved surface and subsurface properties in terms of ultrafine microstructure concentration, higher micro hardness, influence on the thickness and composition of the surface, and subsurface layers and thermal stability. (C) 2019 The Authors. Published by Elsevier B.V.
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