用示差扫描量热仪、拉伸实验和应力--应变循环实验系统研究了退火温度、变形温度以及热循环和室温应力--应变循环对Ti49.4Ni50.6超弹性(SE)弹簧的相变和形变特性的影响. 冷加工加中温退火态Ti49.4Ni50.6合金冷却→加热时的相变类型为母相B2→R相→马氏体B19'.随退火温度升高, 马氏体转变温度升高,R相转变温度降低. 623---773 K退火态Ti49.4Ni50.6弹簧室温下可获得SE特性, 随变形温度升高, SE弹簧刚度增加；当退火温度超过823 K 后,SE特性变差. 热循环时SE弹簧的切变量取值越小, 其应变恢复率越高. 预循环训练可增强SE的稳定性.
Effects of the annealing and deforming temperatures, thermal cycle, and the stress--strain cycle on the transformation and deformation characteristics of Ti49.4Ni50.6 superelastic (SE) coil spring have been investigated by means of differential scanning calorimetry, tensile test, and stress--strain cycling test. The phase--transformed type of the cold worked plus intermediate temperature annealed TiNi alloy is parent phase B2 rightleftharpoons R phase rightleftharpoons martensite B19'during cooling rightleftharpoons heating cycle. The martensitic transformationtemperatures increase and the R--phase transformationtemperatures decrease with increasing the annealingtemperature. The SE property can be obtained at roomtemperature for the 623---773 K annealing Ti49.4Ni50.6alloy spring, and the rigidity of the SE spring increaseswith increasing the deformed temperature. The SE propertyof Ti49.4Ni50.6alloy spring weakens while theannealed temperature is over 823 K. The smaller the takenshear strain, the higher the strain recovery rate ofTiNi SE spring is during the thermal cycle. The priorcyclic training can enhance the SE stability of TiNi
参考文献
| [1] | |
| [2] | |
| [3] | |
| [4] | |
| [5] | |
| [6] | |
| [7] | |
| [8] | |
| [9] | |
| [10] | |
| [11] | |
| [12] | |
| [13] | |
| [14] | |
| [15] |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%