Peculiar microstructural evolution and hardness variation depending on laser powder bed fusion-manufacturing condition in Ti–6Al–2Sn–4Zr–6Mo

材料科学 亚稳态 融合 马氏体 合金 相(物质) 压痕硬度 衍射 微观结构 冶金 热的 激光器 复合材料 热力学 光学 化学 物理 有机化学 语言学 哲学
作者
Prince Valentine Cobbinah,Sae Matsunaga,Yoshiaki Toda,Ryosuke Ozasa,Masayuki OKUGAWA,Takuya Ishimoto,Yuheng Liu,Yuichiro Koizumi,Pan Wang,Takayoshi Nakano,Yoko Yamabe‐Mitarai
标识
DOI:10.1016/j.smmf.2024.100050
摘要

This study aims to comprehensively analyze the phase and microstructure evolution and related hardness variations of the Ti–6Al–2Sn–4Zr–6Mo wt.% (Ti6246) alloy produced by laser powder bed fusion (LPBF) under various laser conditions and to gain insight into the mechanisms of these changes using numerical thermal analysis. Higher laser volumetric densities (VEDs) resulted in a finer α/α' microstructure and increased hardness, exhibiting a positive correlation with the VED, except under extremely high conditions. This contrary trend, reported for the first time, is attributed to the solid-phase transformation from the β phase to metastable α' martensite during LPBF induced by rapid cooling. Despite the finer microstructure, the samples under very high VED conditions showed lower hardness, deviating from the overall trend. The X-ray diffraction peaks in the high-VED samples suggested a partial decomposition of α' to α + β owing to laser-induced reheating of the underlying layers, which is considered a contributing factor to the hardness reduction. The numerical analysis showed that the underlying layer was exposed to high temperatures for a relatively long time under high-VED conditions. It was revealed that the hardness of LPBF-fabricated Ti6246 was influenced by unique thermal processes: rapid cooling and reheating of the pre-solidified part, leading to the formation of a metastable α' phase and partial decomposition into α + β. These findings provide insights for tailoring Ti6246 with desired physical properties via LPBF.
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