Investigating high-rate deformation of stainless steel made by additive fabrication (3D printer) using the split Hopkinson pressure bar technique

Abstract

The paper presents the results of studying the dynamic properties of a structural material, such as stainless steel made by additive fabrication (3D printing). In the study, the split Hopkinson pressure bar system is applied. This method allows us to test a wide range of materials and to study the dynamic diagrams of compression and strain within the strain rate range of e˙ = 102–103 s−1. Specimens made of stainless steel (analogous to the 12Kh18N10T steel) are obtained by laser sintering of metal powder (Selective Laser Sintering) using an industrial 3D printer. Twelve experiments are conducted with the stainless steel specimens. The impactor velocities range from 7 to 14 m/s. The intrinsic strain rates of the specimens range from 0.75×103 to 2.8×103 1/s. The study offers stress–strain and strain-rate –strain diagrams. The objective of the work is to study the properties of stainless steel specimens fabricated by additive techniques. The following tasks are to be solved: determining the strength characteristics of the specimens made of additive stainless steel in a set of experiments using the split Hopkins pressure bars technique; comparing the strength properties of additive stainless steel and its analogue, e.g. the conventional 12Kh18N10T steel.The paper presents the results of studying the dynamic properties of a structural material, such as stainless steel made by additive fabrication (3D printing). In the study, the split Hopkinson pressure bar system is applied. This method allows us to test a wide range of materials and to study the dynamic diagrams of compression and strain within the strain rate range of e˙ = 102–103 s−1. Specimens made of stainless steel (analogous to the 12Kh18N10T steel) are obtained by laser sintering of metal powder (Selective Laser Sintering) using an industrial 3D printer. Twelve experiments are conducted with the stainless steel specimens. The impactor velocities range from 7 to 14 m/s. The intrinsic strain rates of the specimens range from 0.75×103 to 2.8×103 1/s. The study offers stress–strain and strain-rate –strain diagrams. The objective of the work is to study the properties of stainless steel specimens fabricated by additive techniques. The following tasks are to be solved: determining the strength characte...