Surface integrity evolution of machined NiTi shape memory alloys after turning process

doi:10.1007/s40436-020-00330-1

Abstract

Abstract: Owing to their shape memory effect and pseudoelasticity, NiTi shape memory alloys (SMAs) are widely used as functional materials. Mechanical processes particularly influence the final formation of the product owing to thermal softening and work-hardening effects. Surface integrity is an intermediate bridge between the machining parameter and performance of the product. In this study, experiments were carried out on turning NiTi SMAs at different cutting speeds, where surface integrity characteristics were analyzed. The results show that a higher cutting speed of 125 m/min is required to turn NiTi SMAs based on the evaluation of surface integrity. The degree of work hardening is higher at 15 m/min. Consequently, as a primary effect, work hardening appears on the plastic deformation of the machined samples, leading to dislocations and defects. As the cutting speed increases, the thermal softening effect exceeds work hardening and creates a smoother surface. A stress-induced martensitic transformation is considered during the turning process, but this transformation is reversed to an austenite from the X-ray diffraction (XRD) results. According to the differential scanning calorimetry (DSC) curves, the phase state and phase transformation are less influenced by machining. Subsequently, the functional properties of NiTi-SMAs are less affected by machining.

The full text can be downloaded at https://link.springer.com/article/10.1007%2Fs40436-020-00330-1

Key words: NiTi, Shape memory alloys (SMAs), Turning, Surface characteristics, Phase transformation, Microhardness

Yan-Zhe Zhao, Kai Guo, Vinothkumar Sivalingam, Jian-Feng Li, Qi-Dong Sun, Zhao-Ju Zhu, Jie Sun. Surface integrity evolution of machined NiTi shape memory alloys after turning process[J]. Advances in Manufacturing, 2021, 9(3): 446-456.

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