About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
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Symposium
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Additive Manufacturing Fatigue and Fracture: Effects of Surface Roughness, Residual Stress, and Environment
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Presentation Title |
Microstructural Origin of Fatigue Resistance in Additively Manufactured Steels |
Author(s) |
Punit Kumar, Jayaraj Radhakrishnan, Alexis Bryl, James McKinnell, Upadrasta Ramamurty |
On-Site Speaker (Planned) |
Punit Kumar |
Abstract Scope |
The high cycle fatigue behavior of 304L, 316L, 17-4 PH stainless steels produced by laser powder bed fusion and binder jet printing processes were investigated. In conventionally manufactured parts, smaller and larger grains resist the crack initiation and propagation, respectively. However, in additively manufactured (AM) alloys, fatigue crack can easily initiate from pores. Considering this, we examine the effect of grain size on the fatigue resistance of AM steels with various porosity levels. Steels of distinct work hardening behaviors were produced by different AM processes, and hot isostatic pressing (HIP) was employed in certain conditions to reduce porosity. The small and equiaxed grains are beneficial for fatigue resistance; however, HIP is not always sufficient and necessary to improve the fatigue life. The implication of these results in terms of possible directions for designing AM steels with high fatigue resistance will be discussed in detail during the presentation. |
Proceedings Inclusion? |
Planned: |
Keywords |
Additive Manufacturing, Iron and Steel, |