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

doi:10.1007/s40436-020-00330-1

Advances in Manufacturing ›› 2021, Vol. 9 ›› Issue (3): 446-456.doi: 10.1007/s40436-020-00330-1

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

Yan-Zhe Zhao^1,2, Kai Guo^1,2, Vinothkumar Sivalingam^1,2, Jian-Feng Li^1,2, Qi-Dong Sun^1,2, Zhao-Ju Zhu^1,3, Jie Sun^1,2

1 Key Laboratory of High-efficiency and Clean Mechanical Manufacturing, National Demonstration Center for Experimental Mechanical Engineering Education, School of Mechanical Engineering, Shandong University, Jinan 250061, People's Republic of China;
2 Research Center for Aeronautical Component Manufacturing Technology & Equipment, Shandong University, Jinan 250061, People's Republic of China;
3 School of Mechanical Engineering and Automation, Fuzhou University, Fuzhou 350108, People's Republic of China

收稿日期:2020-08-12 修回日期:2020-09-29 出版日期:2021-09-25 发布日期:2021-09-13
通讯作者: Kai Guo E-mail:kaiguo@email.sdu.edu.cn
基金资助:
This work was supported by the National Natural Science Foundation of China (Grant No. 51975335), the Construction Engineering Special Fund of "Taishan Scholars" of the Shandong Province (Grant No. 20190975), the Fundamental Research Funds of Shandong University (Grant No. 2019HW040), and the Key Laboratory of High-efficiency and Clean Mechanical Manufacture at Shandong University, Ministry of Education.

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

Yan-Zhe Zhao^1,2, Kai Guo^1,2, Vinothkumar Sivalingam^1,2, Jian-Feng Li^1,2, Qi-Dong Sun^1,2, Zhao-Ju Zhu^1,3, Jie Sun^1,2

1 Key Laboratory of High-efficiency and Clean Mechanical Manufacturing, National Demonstration Center for Experimental Mechanical Engineering Education, School of Mechanical Engineering, Shandong University, Jinan 250061, People's Republic of China;
2 Research Center for Aeronautical Component Manufacturing Technology & Equipment, Shandong University, Jinan 250061, People's Republic of China;
3 School of Mechanical Engineering and Automation, Fuzhou University, Fuzhou 350108, People's Republic of China

Received:2020-08-12 Revised:2020-09-29 Online:2021-09-25 Published:2021-09-13
Supported by:
This work was supported by the National Natural Science Foundation of China (Grant No. 51975335), the Construction Engineering Special Fund of "Taishan Scholars" of the Shandong Province (Grant No. 20190975), the Fundamental Research Funds of Shandong University (Grant No. 2019HW040), and the Key Laboratory of High-efficiency and Clean Mechanical Manufacture at Shandong University, Ministry of Education.

摘要/Abstract

摘要： 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

关键词: NiTi, Shape memory alloys (SMAs), Turning, Surface characteristics, Phase transformation, Microhardness

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

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

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