https://doi.org/10.1140/epjp/s13360-022-03403-1
Regular Article
Effects of heating cooling rate and cooling method after aging on the thermal properties of Ni-rich NiTiNb alloy with low Nb
1
Department of Mechanical Engineering, Eskisehir Technical University, 26555, Eskisehir, Turkey
2
İBİA Technology, Anadolu Technology Research Park, 26470, Tepebasi, Eskisehir, Turkey
3
Department of Aeronautical Engineering, Erciyes University, 38039, Melikgazi, , Kayseri, Turkey
4
Maicros Advanced Engineering Technologies, Erciyes Teknopark, 38039, Melikgazi, Kayseri, Turkey
Received:
13
June
2022
Accepted:
17
October
2022
Published online:
28
October
2022
In the present study, the effects of heating–cooling rate and the effects of cooling method after aging on the thermal properties of Ni-rich NiTiNb alloy containing low Nb element were investigated. Specimens were aged at 823 K (550 °C) for 5 h and cooled in two media: furnace and water. X-ray diffraction, differential scanning calorimetry, hardness measurement, scanning electron microscopy and compression tests were carried out. Two-step phase transformation during cooling was observed due to the nickel-rich precipitates. The activation energies of the alloys were calculated according to the Kissinger, Takhor, and Ozawa methods. The results indicated that cooling method after aging has a strong effect on the transformation temperatures. The austenite peak temperatures of WQ and FC specimens are 266.4 K and 320.6 K, respectively, at 10 K min−1 heating–cooling rate. A higher critical stress value of 404 MPa was obtained to initiate the martensitic transformation for the WQ specimen compared to the FC specimen (152 MPa).
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