Ti-1023钛合金的低周疲劳行为

Low Cycle Fatigue Behavior of Ti-1023 Titanium Alloy at Room Temperature

摘要:

研究了室温Ti-1023钛合金由应变控制的低周疲劳行为。对循环应力-应变数据和应变-疲劳寿命数据进行了分析，通过双对数线性回归处理，得出了Coffin-Mason处理模型的疲劳参数。结果表明：合金总应变幅在0．6％-0．8％时，循环初期表现出轻微的循环硬化，然后循环稳定；总应变幅超过0．8％时则表现为循环软化。表明合金的循环应力响应行为取决于外加总应变幅。

关键词:钛合金 Ti-1023 力学性能 低周疲劳

Abstract:

Low cyclic fatigue behavior of Ti-1023 titanium alloy has been investigated under a fully reversed total strain-controlled mode. The strain-life and cyclic stress-strain data were analyzed to determine the individual strain fatigue parameters. It is found that the Ti-1023 alloy exhibited an initial slight cyclic hardening, followed by stable cycle at a total strain amplitude of 0.6%-0.8%, then cyclic softening at a total strain amplitude of above 0.8% to 3.0%. It is considered that the cyclic stress response behavior of Ti-1023 alloy depends on the total strain amplitude.

Key words:titanium alloy; Ti-1023; mechanical properties; low cycle fatigue