退火对Ti-50.8Ni镍钛合金丝相变和加工回弹的影响

doi:10.13251/j.issn.0254-6051.2025.07.034

摘要/Abstract

摘要： 研究了退火温度、时间和冷却方式对直径1 mm的Ti-50.8Ni(at%)镍钛合金丝相变、显微组织和加工回弹的影响。结果表明:300~700 ℃退火时,随退火温度的升高,镍钛合金丝的相变温度先降低后升高,硬度逐渐减小,加工回弹量逐渐减小。500 ℃退火后的组织为细小的等轴晶粒,相变过程中出现中间相R相,700 ℃退火后的硬度和回弹量显著减小。500 ℃退火时,随退火时间的增加和冷却速率的降低,镍钛合金丝的相变温度逐渐增加,硬度先增大后减小,加工回弹量逐渐减小。综合评定镍钛合金丝经过500 ℃退火保温50 min炉冷处理后,其硬度较低,加工回弹和超弹性性能损失较小,具有较好的加工性能。

关键词: 镍钛合金丝, 加工回弹, 退火处理, 相变, 硬度

Abstract: Influences of annealing temperature, time, and cooling method on phase transformation, microstructure, and machining springback of Ti-50.8Ni(at%) nitinol wires of 1 mm were systematically investigated. The results reveal that during annealing within the temperature range of 300-700 ℃, the phase transformation temperature of the nitinol wires initially decreases and subsequently increases with rising of annealing temperature. Concurrently, the hardness and machining springback magnitude are progressively reduced. The nitind wires annealing at 500 ℃ yields a microstructure characterized by fine equiaxed grains, with the intermediate R-phase emerging during the phase transformation process, while annealing at 700 ℃ exhibits significantly reduced hardness and machining springback. When annealing at 500 ℃, with increase of holding time and decrease of cooling rate, the phase transformation temperature of the nitinol wires gradually increases, the hardness first increases and then decreases, and the machining springback amount gradually decreases. The comprehensive analysis demonstrates that the nitinol wires subjected to annealing at 500 ℃ for 50 min followed by furnace cooling exhibit lower hardness, smaller degradation in both the machining springback and superelasticity, and consequently the enhanced workability.

Key words: nitinol wire, machining springback, annealing treatment, phase transformation, hardness

中图分类号:

TG156.1

蒋炎, 梁玄, 孔永华. 退火对Ti-50.8Ni镍钛合金丝相变和加工回弹的影响[J]. 金属热处理, 2025, 50(7): 241-247.

Jiang Yan, Liang Xuan, Kong Yonghua. Influence of annealing on phase transformation and machining springback of Ti-50.8Ni nitinol wires[J]. Heat Treatment of Metals, 2025, 50(7): 241-247.

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