Additive Manufactured Parts From ITAMCO Outperform 17-4 PH Stainless Steel
ITAMCO (Indiana Technology and Manufacturing Companies) has additively printed parts made with EOS 17-4 PH IndustryLine metal powder that outperformed 17-4 PH Stainless Steel in tensile strength in a recent research project.
The Research Project
The goal of the research project was to explore the properties of additive-manufactured parts made with the new EOS Stainless Steel 17-4 PH IndustryLine metal powder for Direct Metal Laser Sintering (DMLS). ITAMCO prepared the build of nine cylinders with Sunata™ software by Atlas 3D. Sunata automatically chose the best orientation for the parts and generated the necessary support structures for the build on ITAMCO’s EOS M 290 3D printer.
Three cylinders were built horizontally, three were built at 45˚ to the horizontal, and three were built vertically. After the build, the cylinders were cut from the build plate and sent for heat treatment. The heat treatment followed the recommended steps by EOS.
First, the cylinders were heated to 1040˚ Celsius and kept at that temperature for 0.5 hour. The cylinders were then quenched by argon. After that, the cylinders were reheated to 480˚ Celsius and kept at the temperature for one hour. The cylinders were quenched again by argon. The hardness was between 40 and 47 HRC and the estimated tensile strength was 190 KSI after heat treatment.
The cylinders were then shipped to SGS MSi, a metallurgical testing laboratory. The key results for ITAMCO were the tensile strength (PSI) numbers: The tensile strength of the nine cylinders outperformed the tensile strength of raw material 17-4 PH that had been heat treated. The average tensile strength (PSI) of the nine cylinders was 192,000.* The average tensile strength (PSI) of six heat-treated stainless steels (H900, H1025, H1075, H1150, H1150-M, H1150-D) is 144,000 (Source: https://www.beststainless.com/17-4-ph-stainless-steel.html).
(Call or email Joel Neidig at ITAMCO for the complete test results at (574) 935-6918 or firstname.lastname@example.org.)
“We conducted the research so we could compare the wrought properties of metal to parts made through additive manufacturing with the new EOS 17-4 PH Stainless Steel metal powder. It is quite amazing to us that we achieved the wrought properties of metal,” said Joel Neidig, Business Development and Technology Manager with ITAMCO.
Another interesting finding from the research was that although the nine cylinder samples were built with three orientations, the tensile strength, yield strength, elongation and reduction of area were fairly consistent for all the samples. In other words, the material properties are near isotropic for those samples built additively with different build orientations in the EOS M 290 3D printer.