レーザ積層造形により作製されたMoSiBTiC合金の曲げ挙動

抄録

This paper focuses on characterizing the flexural behavior of a TiC-added Mo-Si-B alloy (MoSiBTiC alloy), which is one of the promising ultra-high temperature materials for aerospace applications, fabricated by additive manufacturing (AM) using the laser powder bed fusion (L-PBF) process. The specimens for flexure tests were prepared from the L-PBF-processed MoSiBTiC alloy blocks before and after hot isostatic pressing (HIP) at 1600 °C and 1700 °C. Four-point bending tests were carried out at room temperature, and the effect of HIP treatments on the mechanical response of the L-PBF-processed MoSiBTiC alloy was examined. The elastic moduli were determined by taking account of the difference in the tensile and compressive stress-strain behaviors. The L-PBF-processed MoSiBTiC alloy specimens exhibited different responses when loaded in tension and compression, and the HIP treatments tended to reduce the difference between the tensile and compressive Young’s moduli. In addition, the HIP conditions led to elastic and strength properties that were superior to the as-built specimen. The relationships between microstructure features and macroscale performance were discussed for the L-PBF-processed MoSiBTiC alloy in the as-built and HIP conditions.