About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
|
Symposium
|
Additive Manufacturing Fatigue and Fracture: Effects of Surface Roughness, Residual Stress, and Environment
|
Presentation Title |
Microstructure-Driven Differences in Fatigue Crack Growth Behavior of Laser Powder Bed Fused Low Alloy Steel Parts for Automotive Applications |
Author(s) |
Whitney Poling, Jake Benzing, Tyson Brown, Nik Hrabe |
On-Site Speaker (Planned) |
Whitney Poling |
Abstract Scope |
Additive manufacturing enables low volume part production and flexible manufacturing for the automotive industry. Metal alloys of known, repeatable properties that are resistant to fracture are of importance for vehicle and tooling applications, but additively manufactured parts often contain internal porosity and heterogeneities in the grain structure which reduce mechanical properties and reliability. Post-processing steps are limited to minimize cost leading to potential porosity and microstructure heterogeneity in the final parts. In this work, low alloy steel parts with 0.1% target porosity were manufactured by laser powder bed fusion and subjected to either a stress relief or a quench and temper heat treatment. The effects of these treatments on microstructure (optical microscopy and electron backscattered diffraction with x-ray computed tomography for porosity) and fatigue crack growth behavior (compact tension experiments) will be presented with an emphasis on discussing mechanisms that drive the measured differences in the Paris Law regime. |
Proceedings Inclusion? |
Planned: |
Keywords |
Additive Manufacturing, Iron and Steel, Mechanical Properties |