What is true about environmental factors and material degradation in AM?

• A. It has the highest energy consumption and environmental impacts; the material can degrade when exposed to moisture and high temperatures for extended periods
• B. AM has the lowest energy consumption and no environmental impact
• C. Materials never degrade in AM
• D. Environmental impact is always negligible in AM processes

Answer: (A)

In additive manufacturing, environmental factors affect both energy use and how materials hold up over time. The equipment often requires substantial energy to power lasers or electron beams, maintain controlled atmospheres, and run cooling and post-processing steps. Because of this, the overall energy demand and potential environmental footprint can be significant, especially for larger parts or certain processes. At the same time, the materials used are sensitive to their surroundings. Polymers can absorb moisture from the air, which can soften them, reduce strength, change dimensions, or speed up aging. High temperatures, whether encountered during processing, in service, or during post-processing, can trigger thermal aging, induce stresses, or promote oxidation and degradation. Taken together, these environmental factors explain why energy consumption and environmental impacts can be high, and why materials may degrade when exposed to moisture and elevated temperatures for extended periods. The other statements underestimate these realities and don’t reflect how AM parts respond to environmental exposure.