QUESTION 2b (0.5 pt) Additive manufacturing, also known as a 3D printing, is an

Question

QUESTION 2b (0.5 pt) Additive manufacturing, also known as a 3D printing, is an increasingly popular method of manufacturing - particularly for precise and/or intricate geometric shapes. One of the primary additive manufacturing methods for metallic components is called selective laser melting (SLM), and the proces is illustrated below (google it for more information): 3D-CAD model In layers 1. Deposition of a powder layer 2. Melting of the powder by a laser beam 7l Metal powder 3. Lowering of the platform ource: 1Q Evolution One characteristic of metal-based additive manufacturing, including SLM, is that the material is heated and cooled very quickly due to the fast speed of the high energy laser and its small spot size. As such, cooling rates exceeding 10,000 °C per second from melting point to room temperature is usually achieved. Many people are interested in making load bearing applications that requires high toughness using additive manufactured steel. Based on the TTT diagram shown for 1080 Eutectoid steel - what do you anticipate to be a potential problem for this?

Explanation / Answer

The fast heating and rapid quenching of the melted part for AM products will result in the martensitic transformation of material. The phase will yield to the high surface hardness of the AM parts but impart brittleness or lowered toughness in this case. The problem will continue to occur even for increased carbon percentage in similar steels.

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