Volume 24, Issue 8 (August 2024)
Modares Mechanical Engineering 2024, 24(8): 475-484 |
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Lohrasbi S, Nakhodchi S. The Effect of Cold Pre-Strain on the Tensile and Compressive Strength of Inconel 718 Superalloy Produced by Selective Laser Melting. Modares Mechanical Engineering 2024; 24 (8) :475-484
URL: http://mme.modares.ac.ir/article-15-76607-en.html
URL: http://mme.modares.ac.ir/article-15-76607-en.html
1- K.N.Toosi University of Technology
2- K. N. Toosi University of Technology ,snakhodchi@kntu.ac.ir
2- K. N. Toosi University of Technology ,
Abstract: (819 Views)
Inconel 718 superalloy is widely used in various industries due to its excellent high-temperature properties. The production of components made from Inconel 718 superalloy through the Selective Laser Melting (SLM) method enables the fabrication of parts with complex geometries. Therefore, improving the mechanical properties of parts produced by SLM using secondary strengthening processes is of great importance. This study investigates the effect of cold pre-strain on the tensile and compressive strength of Inconel 718 superalloy samples produced by SLM. The test specimens were produced by the SLM method and subjected to single-stage (5%-15%-30%) and two-stage (4%-12%-16%) loading. To examine the impact of initial loading on mechanical properties, tensile, compression, and hardness tests were performed, and the microstructure behavior was analyzed using an optical microscope. The results indicate that the yield strength and ultimate tensile strength of the Inconel 718 superalloy in the Y-axis (XY plane) increased by 31.8% and 11.6%, respectively, after applying a 30% initial strain along the Z-axis. The compressive yield strength of Inconel 718 superalloy increased by 79.3% in the Z-direction with a 30% pre-strain. In other words, applying pre-strain along the Z-axis affects the compressive strength in the XZ plane as the principal strain and the tensile strength in the XY plane as the shear strain. Increasing pre-strain to 30% has a minimal effect on the hardness properties of Inconel 718 superalloy. The results from the two-stage loading process indicate an enhancement in strength with the increase in the number of loading stages, attributed to the work-hardening phenomenon
Keywords: Inconel 718, Additive Manufacturing, Selective Laser Melting, Strengthening, Cold Pre-Strain
Article Type: Original Research |
Subject:
Plasticity
Received: 2024/08/17 | Accepted: 2024/10/22 | Published: 2024/07/31
Received: 2024/08/17 | Accepted: 2024/10/22 | Published: 2024/07/31
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