STUDYING ABOUT OPTIMIZING HEAT TREATMENT PROCESS OF TiAl6V4 AND Ti-CP WELD JOINTS

Abstract

This paper presents the results of research on optimizing the heat treatment process and microstructures of Ti and TiAl6V4 welds after heat treatment. The results of optimization analysis have determined the optimal heat treatment process to ensure optimal results in terms of hardness, strength and relative elongation. The optimal value results at the quenching temperature of 930^oC, the aging temperature of 518^oC and the aging time of 2 hours. With these results, the model predicts the weld hardness is 54,4HRC, the tensile strength is 453,9N/mm² and the relative elongation is 19,3%. The analysis results of the microstructures of the weld after aging at 525^oC for 4 hours have determined the phase decomposition process of the weld after heat treatment. The aging process according to temperature and time decomposes the α' martensite phase after cooling into αm and βr phases, transforms the β phase into α, and changes the shape and distribution of the α and β phases after quenching.