Tabbin Institute for Metallurgical Studies, Cairo, Egypt.
Central Metallurgical Research and Development Institute, Box 87, Helwan, Egypt.
Sci Rep. 2023 Jul 12;13(1):11292. doi: 10.1038/s41598-023-38250-2.
The influence of heat treatment processes on microstructure, tensile and tribological properties of Ti6Al4V alloy was investigated. The specimens were heated for 30 min at 925 °C and then cooled at various rates by water quenching, air cooling, and furnace cooling. After that, the samples were aged for four hours at 600 °C. Three phases make up the microstructure: primary α-phase (α), secondary α-phase (α), and retained β-phase (β). Cooling in the air and water followed by aging (AC + Aging and WQ + Aging) resulted, α-phase precipitating inside β-phase. The highest hardness of 35 HRC was recorded for WQ + Aging specimen due to existence of a high amount of β-phase and precipitation of α-phase. On the other hand, the lowest hardness of 26 HRC was obtained for the FC specimen. AC specimen achieved the highest elongation value of 14%. However, WQ + Aging specimen exhibited the highest ultimate tensile strength of 1028 MPa. For WQ + Aging and AC + Aging specimens, the ideal balance of strength and elongation was discovered. The wear resistance of solution-treated specimens was significantly improved by the aging process and 125% improvement could be achieved in WQ compared to WQ + Aging specimens.
研究了热处理工艺对 Ti6Al4V 合金的微观结构、拉伸和摩擦学性能的影响。将样品在 925°C 下加热 30 分钟，然后通过水淬、空冷和炉冷以不同的速率冷却。之后，将样品在 600°C 下时效 4 小时。该微观结构由三种相组成：初生α相（α）、次生α相（α）和残余β相（β）。在空气和水中冷却然后时效（AC+Aging 和 WQ+Aging）会导致β相内析出α相。由于存在大量的β相和α相的析出，WQ+Aging 试样的硬度最高，达到 35 HRC。另一方面，FC 试样的硬度最低，为 26 HRC。AC 试样的伸长率最高，达到 14%。然而，WQ+Aging 试样表现出最高的极限拉伸强度为 1028 MPa。对于 WQ+Aging 和 AC+Aging 试样，发现了强度和伸长率的理想平衡。时效处理显著提高了固溶处理试样的耐磨性，与 WQ+Aging 试样相比，WQ 可提高 125%。
