Understanding Additive Manufacturing Glossary — Lesson 5

This lesson covers the glossary of terms used in additive manufacturing, starting from the letter 'F'. It explains the importance of flowability in metal additive manufacturing and the role of Fourier's Law in heat transfer. The lesson also discusses functionally graded lattice structures, hatch patterns, heating depth ratio, and image segregation. It further elaborates on intergranular cracking, intrinsic properties, keyhole process, lack of fusion, lamellar tearing, and laser types. The lesson also touches upon layer thickness, nucleation, phase diagram, photodiodes, porosity, rheological properties, scanning strategies, solidification, staircase effect, topology optimization, unit cells, and wire feed system. For instance, the lesson explains how a staircase effect, a common defect in 3D printing, gives the perception of a staircase on the surface of the part.

Video Highlights

00:13 - Introduction to the glossary of terms used in additive manufacturing
05:16 - Explanation of the term 'Hatch Pattern' and its significance in additive manufacturing
11:04 - Discussion on 'Lack of Fusion' and its causes in laser additive manufacturing
16:03 - Introduction to 'Rheological Properties' and their importance in polymers and metals
19:06 - Introduction to 'Wire Feed System' in additive manufacturing

Key Takeaways

- Flowability, the capacity of fluids and loose particulate solids to move by flow, plays a crucial role in metal additive manufacturing.
- Fourier's Law states that the time rate of heat transfer through a material is proportional to the negative gradient in the temperature and the area at right angles to that gradient.
- Functionally graded lattice structures are designed using lattices with varying distribution of porosity.
- Hatch patterns refer to the manner in which material is filled in a layer in additive manufacturing.
- Intergranular cracking arises at the grain boundaries during the last step of solidification.
- Intrinsic properties related to the substrate and powder properties include absorptivity, thermal conductivity, heat capacitance, thermal diffusivity, and substrate geometry.
- The staircase effect is a common defect in 3D printing, where layer marks become distinctly visible on the surface of the part.