四川大学 制造科学与工程学院
国家自然科学基金(U1730125),国家自然科学基金项目（面上项目，重点项目，重大项目）
School of manufacturing science and engineering,Sichuan University,Chengdu
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为了降低镍钛铌(NiTiNb)宽滞后记忆合金紧固环的制备成本,研究了退火对激光焊接接头力学性能和记忆效应的影响。焊接接头在850 ℃进行了退火处理。结果表明：焊接接头的组织粗大且不均匀,抗拉强度与延伸率均显著低于母材。经过退火后,再结晶导致焊接接头组织更加均匀；母材与焊接接头抗拉强度均大幅度下降,但延伸率均得到较大提高,尤其是焊接接头的延伸率可以提升到28.57%。退火态焊接接头在-40 ℃变形13%时表现出接近于母材的的形状恢复率。
In order to reduce the manufacturing cost of fastening rings made of NiTiNb wide hysteresis memory alloy, the Influences of annealing on mechanical properties and shape memory effects of laser welding joints were investigated. The welding were annealed at 850 ℃. The results showed that the microstructure of the welding joints was coarse and uneven. The Tensile strength and elongation of the joints were significantly lower than that of the base metal. After annealing, recrystallization leads to more uniform microstructure of welding joints. The tensile strength of base metal and welding joints decreased substantially, but the elongation increased greatly. The elongation of welding joints has increased to 28.57%. After 13% bending deformation at -40 ℃, the shape recovery rate of the annealed welding joints was closed to that of the matrix.
引用本文
范新虎,廖琪,曹新迪,彭华备,文玉华.退火对Ni<sub>47</sub>Ti<sub>44</sub>Nb<sub>9</sub>合金激光焊接接头力学性能与形状记忆效应的影响[J].稀有金属材料与工程,2020,49(1):355~360.[Fan Xinhu, Liao Qi, Cao Xindi, Peng Huabei, Wen Yuhua. Influences of annealing on mechanical properties and shape memory effects of laser welding joints of Ni47Ti44Nb9 alloy[J]. Rare Metal Materials and Engineering,2020,49(1):355~360.]
DOI：10.12442/j. issn.1002-185X.20181070
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历史
- 收稿日期:2018-10-22
- 最后修改日期:2018-11-12
- 录用日期:2018-11-22
- 在线发布日期: 2020-02-16