Determination of Johnson–Cook Constitutive of 15-5 PH Steel Processed by Selective Laser Melting

Abstract

To obtain a Johnson–Cook model of 15-5 PH steel formed by selective laser melting (SLM), and to determine the difference between the forging process, in this work, mechanical testing, penetration testing and numerical simulations were used to study 15-5 PH steel formed by SLM and forging. Finally, the Johnson–Cook model parameters and failure parameters of the 15-5 PH steel formed by SLM and forging were obtained. We found that the SLM process was beneficial for refining the grain size of 15-5 PH steel and for improving the mechanical properties of 15-5 PH steel, where the yield strength of its specimens increased by 13.1% compared with the forged specimens. The error between the numerical simulations and penetration tests was less than 10%, which verified the validity of the numerical model parameters. It was also found that the penetration ability and abrasion resistance of the SLM-shaped projectiles were slightly superior to those of the forged projectiles.

A Data-Driven Approach for Cutting Force Prediction in FEM Machining Simulations Using Gradient Boosted Machines

“…The J-C constitutive model can describe the deformation of low-carbon steel after determination of the parameters with compression and tensile tests [13]. In other works, the J-C parameters A, B, and n were determined by means of quasi-static tests, C was determined via SHPB test fitting, and m was obtained by hightemperature compression tests [14]. The downside to this direct approach of determining J-C parameters is the necessity to access expensive material testing devices.…”