High Strain Rate Yielding of Additive Manufacturing Inconel 625 by Selective Laser Melting.

Kang Du,Chao Xu,Yang Gao,Bin Wang,Laixia Yang

doi:10.3390/ma14185408

Kang Du, Chao Xu + Show 3 more

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https://doi.org/10.3390/ma14185408

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Abstract

Nickel-based alloy Inconel 625, produced by the selective laser melting method, was studied experimentally for its mechanical performance under strain rate loading using Hopkinson bars. Both compression and tensile tests were carried out, with the former also being conducted at 500 °C. The strain rate was in the range of 300 to 3500 s−1 at ambient temperature, and 1200 to 3500 s−1 at the elevated temperature, respectively, for compression tests, and 900 to 2400 s−1 for tensile tests. Results show that the alloy has a strong rate sensitivity with the dynamic yield stress at 3500 s−1, almost doubling the quasistatic value. The test results also show that, even though the temperature elevation leads to material softening, the strain rate effect is still evidential with the dynamic compressive yield stress at the rate 103 s−1 and 500 °C still being higher than the quasistatic one at ambient temperature. It is also observed that dynamic tensile strengths are generally higher than those of compressive ones at room temperature.

Highlights

Nickel-based alloy Inconel 625, produced by the selective laser melting method, was studied experimentally for its mechanical performance under strain rate loading using Hopkinson bars
Nickel-based high temperature alloys are used extensively for engine blades. When they are hit by foreign objects, such as bird strikes or fractured pieces, high speed impact occurs and to the blades yielding in deformation under high strain rate loading
The following conclusions can be drawn from the test results: compression tests at 500 °C

Summary

Introduction

Nickel-based alloy Inconel 625, produced by the selective laser melting method, was studied experimentally for its mechanical performance under strain rate loading using Hopkinson bars. Both compression and tensile tests were carried out, with the former being conducted at 500 ◦ C. The selective laser melting (SLM) method is one of the additive manufacturing technologies that has been developed rapidly in recent years It has incomparable advantages over traditional manufacturing technologies, such as its integrated forming of complex structures, weight, topology optimization, and material utilization. SLM is one of the most rapidly developing additive manufacturing technologies in recent years It has incomparable advantages in complex structure integration forming, weight, topology optimization, and material utilization. Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations

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