Grain Size Effects in Selective Laser Melted Fe-Co-2V

Abstract

The material science of additive manufacturing (AM) has become a significant topic due to the unique way in which the material and geometry are created simultaneously. Major areas of research within inorganic materials include traditional structural materials, shape memory alloys, amorphous materials, and some new work in intermetallics. The unique thermal profiles created during selective laser melting (SLM) may provide new opportunities for processing intermetallics to improve mechanical and magnetic performance. A parameter set for the production of Fe-Co-2V material with additive manufacturing is developed and efforts are made to compare the traditional wrought alloy to the AM version of the same chemistry. Evaluation includes magnetic properties, composition, and phase as a function of thermal history, as well as mechanical performance. Results show significant similarities in microstructure between AM and wrought materials, as well as mechanical and magnetic performance. Property trends are evaluated as a function of grain size and show effects similar to the Hall–Petch strengthening observed in wrought material, though with some underprediction of the strength. Magnetic properties qualitatively follow the expected trends but demonstrate some deviation from wrought material, which is still unexplained.

Processing–Microstructure–Property Relationships in a Laser‐Deposited Fe‐Co‐V Alloy

“…Figure shows a comparison between the predicted coercivity using Equation () compared to measured coercivity and grain size from DED Fe49Co2V and wrought Fe49Co2V. The grain size and the corresponding coercivity for the low, medium, and high processed laser‐deposited material follow similar behavior, which is consistent with the reported data for both wrought and AM materials [ 24,25 ] and the generally accepted mechanism of grain boundaries acting as pinning agents and restricting domain wall movement.…”

Magnetic properties, adhesive characteristics, and optical properties of Co40Fe40W20films

“…Finally, H c decreased to 1.23 Oe at 90 nm. The amorphous structure of the Co 40 Fe 40 W 20 films indicated that the smaller H c was due to the small grain size distribution of the amorphous state when t f ranged from 18 to 42 nm [29][30][31][32]. The H c value was smaller than 2 Oe, suggesting the Co 40 Fe 40 W 20 films had soft magnetism, thus making them suitable for MRAM and recording head applications.…”

Effects of Laser Beam Parameters on Bendability and Microstructure of Stainless Steel in Three-Dimensional Laser Forming

“…This might be attributed to the complete phase transformation, as above 1,422 K and up to the melting point (1,422 K ˂ T ˂ 1,713 K) ferrites form in the alloy [23]. Notably, the increase in formability of the material was proportional to the decrease in grain size of the heated sample [24][25][26]. The homogenized equiaxed fine grains in the microstructure were also associated with a decrease in anisotropy.…”