研究目的
Investigating the effect of machining operations on the residual stress state of an AlSi10Mg component produced by Laser Powder Bed Fusion (L-PBF).
研究成果
The study found that milling operations induce a surface tensile stress and a subsurface compressive state in AlSi10Mg components produced by L-PBF. The compressive stress on the additive manufactured part was lower than that induced on a conventional part of the same material. Higher force increases the subsurface compressive state and penetration depth.
研究不足
The study focuses on AlSi10Mg components and the effect of milling operations on residual stresses. The findings may not be directly applicable to other materials or machining processes.
1：Experimental Design and Method Selection
The study involves the use of the hole-drilling strain gauge method to measure residual stresses in AlSi10Mg components produced by L-PBF and subsequently subjected to milling operations.
2：Sample Selection and Data Sources
Two aluminum alloy specimens were produced using an EOSINT M 270 Dual Mode machine. An additional aluminum alloy specimen produced by conventional sand casting and shot-peened was tested for comparison.
3：List of Experimental Equipment and Materials
EOSINT M 270 Dual Mode machine, K-RY61-1.5/120R rosette strain gauge, MTS3000 RESTAN system by SINT Technology, 90° shoulder face milling cutter with APKT160408A-2C rectangular inserts, quartz 3-component Kistler Type 9257BA dynamometer.
4：Experimental Procedures and Operational Workflow
The specimens were subjected to a stress relieving thermal treatment, followed by milling operations. Residual stresses were measured before and after machining tests using the hole-drilling method.
5：Data Analysis Methods
Residual stresses were computed according to ASTM E837-13a standard using LabVIEW 2017 for data acquisition and analysis.
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