Understanding Metal Additive Manufacturing - 3 — Lesson 3

This lesson covers the evaluation of products produced through Metal Additive Manufacturing, focusing on mechanical property evaluation, tensile strength, and fatigue testing. It delves into the importance of tensile and static strength of additive manufactured parts and the challenges faced due to the layer-by-layer manufacturing process. The lesson also discusses the impact of different starting materials like powder and wire on the properties of the final product. It further explains the role of destructive and non-destructive testing techniques in evaluating the quality of the output. The lesson concludes by discussing the influence of factors like grain morphology, defect type, build direction, surface roughness, residual stresses, and post-processing heat treatment on the fatigue behaviour of additive manufactured parts.

Video Highlights

00:37 - Discussion on mechanical property evaluation, tensile and fatigue testing
07:13 - Discussion on the comparison of the tensile property of additive manufactured steel to that of conventional steel
20:16 - Explanation of the fatigue behaviour of additive manufactured alloys
33:12 - Explanation of the fatigue performance of ferrous alloys, aluminium alloys, nickel alloys, and titanium alloys in additive manufacturing

Key Takeaways

- Tensile and static strength are crucial for evaluating the quality of additive manufactured parts.
- The layer-by-layer manufacturing process in additive manufacturing can result in different properties in different directions.
- The starting material (powder or wire) can significantly impact the properties of the final product.
- Both destructive and non-destructive testing techniques are used to evaluate the quality of the output.
- Factors like grain morphology, defect type, build direction, surface roughness, residual stresses, and post-processing heat treatment can influence the fatigue behaviour of additive manufactured parts.