PDF(Pubmed)
Abstract：
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.
摘要：
在这项工作研究中，进行了比较分析，以研究激光粉末床融合（LPBF）TC4和铸态TC4在0.6mol/LNaCl溶液中的空化侵蚀（CE）和腐蚀行为。相关结果表明，与铸态TC4相比，LPBFTC4显示出具有更精细晶粒尺寸的矩形棋盘状图案。同时,LPBFTC4在CE电阻方面超过了其实播对手，在8小时CE后，累积质量损失降低了约2.25倍。在交替的CE和静止条件下的腐蚀电位表明，LPBFTC4和铸态TC4在CE的初始阶段都经历了快速的电位下降，虽然随着CE时间的不断增加，腐蚀电位出现了一致的负移，表明再钝化能力逐渐下降。在早期CE阶段腐蚀电位的初始波动主要归因于加速的氧转移。随着CE的进步，LPBFTC4和铸态TC4的腐蚀电位显着降低归因于钝化膜的击穿。LPBFTC4中细化和均匀的微观结构有效地抑制了裂纹的形成和扩展，强调了LPBF技术在提高钛合金耐CE性能方面的潜力。这项工作可以为开发高质量，可靠,和可持续的耐CE材料通过LPBF技术。
