摘要
利用拉伸试验研究了350~800℃退火态Ti-50.8Ni-0.3Cr合金弹簧在-20~20℃温度范围变形时的低温超弹性。结果表明,在350~800℃温度范围退火时,随退火温度升高,该合金弹簧对外输出应力先降低再升高,而后趋于稳定。在-20~20℃温度范围变形时,随变形温度升高,该合金弹簧对外输出应力增大。要使该合金弹簧在-20℃下获得残余应变较小的超弹性,可对其进行350~400℃或550~800℃退火处理;要使该合金弹簧在-10~20℃下获得残余应变较小的超弹性,可对其进行350~500℃退火处理;要使该合金弹簧在-20~20℃下获得较大的能耗,可对其进行450~800℃退火处理。随退火温度升高,该合金弹簧的应变恢复率降低;随应力-应变循环次数增加,该合金弹簧的应变恢复率先降低后趋于稳定。预循环训练能明显提高该合金弹簧应变恢复率的稳定性。
The low-temperature superelasticity of Ti-50.8Ni-0.3Cr alloy springs annealed at 350-800℃during deformation in the temperature range of-20-20℃was studied using tensile tests.The results show that when annealing in the temperature range of 350-800℃,as the annealing temperature increases,the external output stress of the alloy springs first decreases and then increases,and then tends to stabilize.When deformed within the temperature range of-20 to 20℃,as the deformation temperature increases,the external output stress of the alloy springs increases.To achieve superelasticity with smaller residual strain of the alloy spring at-20℃,it can be annealed at 350-400℃or 550-800℃.To achieve superelasticity with smaller residual strain of the alloy spring at-10-20℃,it can be annealed at 350-500℃.To achieve high energy dissipation of the alloy spring at-20-20℃,it can be annealed at 450-800℃.As the annealing temperature increases,the strain recovery rate of the alloy springs decreases.As the number of stress-strain cycles increases,the strain recovery rate of the alloy springs first decreases and then tends to stabilize.Pre-cycle training can significantly improve the stability of the strain recovery rate of the alloy springs.
作者
张永宏
贺志荣
ZHANG Yong-hong;HE Zhi-rong(School of Materials Science and Engineering,Shaanxi University of Technology,Hanzhong 723001,China)
出处
《材料热处理学报》
CAS
CSCD
北大核心
2024年第8期92-99,共8页
Transactions of Materials and Heat Treatment
基金
陕西省自然科学基金(2012JM6016)。
