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采用金相显微镜、电子背散射衍射(EBSD)、维氏硬度计、差示扫描量热仪(DSC)和电阻-温度测量仪,研究了不同温度(300~900℃)退火1 h对Ni47Ti44Nb9合金冷轧板的微观组织、力学性能及相变行为的影响。结果表明,当热处理温度低于400℃时,材料硬度值变化不明显,合金未发生马氏体相变;当退火温度为400℃时,硬度值显著下降,合金开始发生再结晶;当退火温度在500~800℃时,随着温度升高,再结晶越充分,马氏体相变温度越高,相变焓增加。800℃退火1 h后,合金基本完成再结晶,晶粒尺寸约11μm;当退火温度升高至900℃,晶粒出现长大现象,晶粒尺寸增加至20μm。
The effects of annealing at different temperatures (300 ~ 900 ℃) for 1 h on the wear resistance of Ni47Ti44Nb9 alloy were studied by means of optical microscope, EBSD, Vickers hardness tester, differential scanning calorimeter (DSC) and resistance- Cold Rolled Plate Microstructure, Mechanical Properties and Phase Transformation Behavior. The results show that when the heat treatment temperature is lower than 400 ℃, the hardness of the material does not change obviously, and the martensitic transformation does not occur. When the annealing temperature is 400 ℃, the hardness decreases obviously and the alloy begins to recrystallize. When the annealing temperature At 500 ~ 800 ℃, with the increase of temperature, recrystallization more fully, the higher the martensitic transformation temperature, the phase transition enthalpy increases. After annealing at 800 ℃ for 1 h, the alloy was basically recrystallized and the grain size was about 11μm. When the annealing temperature was raised to 900 ℃, the grains grew up and the grain size increased to 20μm.