Host: The Japan Society of Mechanical Engineers
Name : Mechanical Engineering Congress,Japan
Date : September 11, 2016 - September 14, 2016
The Co-Cr-Mo alloy is used for a prosthetic slide part to be superior in wear resistance. The custom-made medical application is examined for the Quality Of Life (QOL) improvement of the person with skeletal system medical care disease. Therefore, the Electron Beam Melting (EBM) that a little and free shape can manufacture is effective for the production of custom-made devices. However, crystal structures are different for the molding position. The end samples (No.5) had short fatigue life. On the other hand, the center samples had long fatigue life. This depends on crystal structure. This is because the central samples has γ phase and the end samples has ε phase. Thus, γ phase influences in improvement of the fatigue life. Therefore I thought that crystal structure is changed γ phase by the heat-treatment. EBM sample was performed heart-treatment (change the ε phase) and reverse transformation heart-treatment (change the γ phase).I performed a hardness examination afterwards. As a result, all specimens became the hardness of the equal degree. The hardness decreased in comparison with before heat-treatment. Thus, I was able to become a γ phase.
