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利用金相观察、硬度测试、热模拟技术及透射电子显微镜(TEM),研究了Fe-40Ni-Ti合金的组织及力学性能。结果表明,Fe-40Ni-Ti合金在室温下为面心立方结构,晶粒中有少量孪晶组织。高温变形后试样中有两类析出物,一类是在光学显微镜下直接观察到的1μm以上合金凝固过程中形成的TiN颗粒,另一类是在TEM下发现的轧制应变诱导析出,尺寸在20 nm以下的TiN颗粒。合金在不同温度保温后冷却到室温的硬度变化不明显。在850℃变形后保温过程中,合金发生应变诱导析出现象。
The microstructure and mechanical properties of Fe-40Ni-Ti alloy were studied by metallographic observation, hardness test, thermal simulation and transmission electron microscopy (TEM). The results show that the Fe-40Ni-Ti alloy has a face-centered cubic structure at room temperature with a small amount of twins in the grains. There are two kinds of precipitates in the sample after high-temperature deformation. One is the TiN particles formed during the solidification of 1μm or more directly observed under a light microscope, and the other is the strain induced by precipitation under TEM. The size TiN particles below 20 nm. The hardness of the alloy after cooling to room temperature after different temperature is insignificant. In 850 ℃ deformation after the heat preservation process, the alloy strain induced precipitation phenomenon.