一种新型低成本阻燃钛合金的微观组织与力学性能

Microstructure and Mechanical Properties of a New Type Burn Resistant Titanium Alloy with Lower Cost

摘要:

研究了一种名义成分为Ti-25V-15Cr-5Mo-0.25Si-0.08C的新型低成本阻燃钛合金TF-X,通过三次真空自耗熔炼制备了φ120mm铸锭,经包套挤压得到φ25mm棒材,观察了铸锭和挤压棒材的微观组织,测试并分析了挤压棒材的室温和高温拉伸性能、热稳定性能、高温蠕变性能。结果表明：TF-X合金具有与TF550合金大致相同的微观组织；TF-X合金室温及高温拉伸强度高于TF550合金,并且具有很好的塑性；试验条件下,TF-X合金的热稳定性能低于TF550合金,熔炼过程中应该严格控制氧含量；TF-X合金在540℃/250MPa/100h条件下蠕变性能与TF550合金相当,显著高于Ti40合金。

Abstract:

The ingot with 120mm diameter of Ti-25V-15Cr-5Mo-0.25Si-0.08C alloy which is a new type burn resistant titanium alloy with lower cost was produced by vacuum arc remelting in this study. This ingot was forged into bars with 25mm diameter by sheathed extrusion. The microstructures of the ingot and extrusion bars of TF-X alloy were studied. The tensile, thermal stability and creep properties of extrusion bars of TF-X alloy were tested under different conditions. The results show that microstructures of TF-X alloy, which has better ductility in tensile test, were roughly the same as TF550 alloy. In addition, TF-X alloy has higher strength and worse thermal stability than TF550 alloy, and its creep property better than Ti40 alloy was equivalent to TF550 alloy.