Yang Zhou, Li Liang, Qiao Yanxin, Li Chengtao, Zhang Lianmin, Cui Jie, Ren Dechun, Ji Haibin, Zheng Yugui
School of Materials Science and Engineering, Jiangsu University of Science and Technology, Zhenjiang 212003, China; CAS Key Laboratory of Nuclear Materials and Safety Assessment, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China.
School of Materials Science and Engineering, Jiangsu University of Science and Technology, Zhenjiang 212003, China.
Ultrason Sonochem. 2024 Aug;108:106947. doi: 10.1016/j.ultsonch.2024.106947. Epub 2024 Jun 8.
In this work study, a comparative analysis was undertaken to investigate investigation into the cavitation erosion (CE) and corrosion behavior of laser powder bed fusion (LPBF) TC4 and as-cast TC4 in 0.6 mol/L NaCl solution. Relevant results indicated that LPBF TC4 revealed a rectangular checkerboard-like pattern with a more refined grain size compared to as-cast TC4. Meanwhile, LPBF TC4 surpassed its as-cast counterpart in CE resistance, demonstrating approximately 2.25 times lower cumulative mass loss after 8 h CE. The corrosion potential under alternating CE and quiescence conditions demonstrated that both LPBF TC4 and as-cast TC4 underwent a rapid potential decrease at the initial stages of CE, while a consistent negative shift in corrosion potential was observed with the continuously increasing CE time, indicative of a gradual decline in repassivation ability. The initial surge in corrosion potential during the early CE stages was primarily attributed to accelerated oxygen transfer. As CE progressed, the significant reduction in corrosion potential for both LPBF TC4 and as-cast TC4 was attributed to the breakdown of the passive film. The refined and uniform microstructure in LPBF TC4 effectively suppresses both crack formation and propagation, underscoring the potential of LPBF technology in enhancing the CE resistance of titanium alloys. This work can provide important insights into developing high-quality, reliable, and sustainable CE-resistant materials via LPBF technology.
在这项研究工作中，进行了一项对比分析，以研究激光粉末床熔融（LPBF）TC4和铸态TC4在0.6 mol/L NaCl溶液中的空蚀（CE）和腐蚀行为。相关结果表明，与铸态TC4相比，LPBF TC4呈现出矩形棋盘状图案，晶粒尺寸更精细。同时，LPBF TC4在抗空蚀方面超过了铸态TC4，在8小时空蚀后累计质量损失降低了约2.25倍。交变空蚀和静止条件下的腐蚀电位表明，LPBF TC4和铸态TC4在空蚀初始阶段均经历了快速的电位下降，而随着空蚀时间的不断增加，腐蚀电位持续负移，表明再钝化能力逐渐下降。空蚀早期阶段腐蚀电位的初始激增主要归因于加速的氧传递。随着空蚀的进行，LPBF TC4和铸态TC4腐蚀电位的显著降低归因于钝化膜的破坏。LPBF TC4中细化且均匀的微观结构有效地抑制了裂纹的形成和扩展，凸显了LPBF技术在提高钛合金抗空蚀性能方面的潜力。这项工作可为通过LPBF技术开发高质量、可靠且可持续的抗空蚀材料提供重要见解。
