Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 769, Issue -, Pages 898-905Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2018.08.079
Keywords
Laser additive manufacture; Milling; Residual stress; Stress coupling
Categories
Funding
- National Natural Science Foundation of China [51605262]
- Key Scientific and Technological Project of Shandong Province [2017CXGC0813]
- Shandong Provincial Natural Science Foundation [ZR2016EEB17]
- China Postdoctoral Science Foundation [2017M610439]
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Additive manufacturing is a revolutionary frontier technology in the manufacturing industry. High-performance metal materials made by laser additive manufacturing are usually required subtractive machining to meet the assembly accuracy requirements. The stress coupling mechanism of FeCr alloy made by laser additive and milling subtractive is worthy of being studied. In present work, the impact of milling on residual stress of laser additive layer was investigated through experiments. The coupling interaction mechanism of laser additive stress and milling subtractive stress was analyzed. The key findings of this study are: (a) milling can change the near surface residual stress distribution of FeCr alloy made by laser additive manufacturing, resulting in a certain depth of compressive stress affected zone; (b) Mechanical load generated by milling is the main cause of compressive stress near the surface; and (c) the magnitude of compressive stress is affected by the combined effects of mechanical load and thermal load introduced by milling. (C) 2018 Elsevier B.V. All rights reserved.
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