Host: The Japan Society of Mechanical Engineers
Name : [in Japanese]
Date : October 04, 2024 - October 05, 2024
Wire and Arc Additive Manufacturing (WAAM) uses active cooling methods such as water cooling to prevent crystal grain enlargement due to high heat input. However, water cooling of magnesium (Mg) alloys in a high-temperature state is not suitable because of the risk of combustion and explosion. In this study, we propose an active cooling method in which two copper blocks with internally circulating cooling water is brought into direct contact with the fabricated wall component. The effect of active cooling on the temperature and strength anisotropy of the Mg fabricated wall components was investigated. As a result, the temperature during fabrication was lowered by active cooling. The crystals became smaller and grew into equiaxed grains because of the reduction in temperature. The mechanical properties in the build-up direction were improved due to grain size reduction. The strength in the torch feed direction was higher than in the build-up direction. Active cooling reduced strength anisotropy.
