Prediction of SLM-NiTi transition temperatures based on improved Levenberg–Marquardt algorithm

Prediction of SLM-NiTi transition temperatures based on improved Levenberg–Marquardt algorithm

In this study, we have obtained the corresponding relationship between SLM-NiTi alloy transition temperatures and energy density, and realized the accurate prediction and inverse prediction of SLM process parameters and NiTi alloy transition temperatures. And we verify the accuracy of the prediction...

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Bibliographic Details
Main Authors: Zhenglei Yu, Zezhou Xu, Ruiyao Liu, Renlong Xin, Lunxiang Li, Lixin Chen, Pengwei Sha, Wanqing Li, Yining Zhu, Yunting Guo, Jiale Zhao, Zhihui Zhang, Luquan Ren
Format: Article
Language:English
Published: Elsevier 2021-11-01
Series:Journal of Materials Research and Technology
Subjects:
Selective laser melting
NiTi shape memory alloys
Additive manufacturing
Levenberg–Marquardt algorithm
Transition temperatures
Online Access:http://www.sciencedirect.com/science/article/pii/S2238785421010668
Description
Summary:In this study, we have obtained the corresponding relationship between SLM-NiTi alloy transition temperatures and energy density, and realized the accurate prediction and inverse prediction of SLM process parameters and NiTi alloy transition temperatures. And we verify the accuracy of the prediction model through DSC, XRD and SEM. Secondly, B19′NiTi and B2NiTi are successfully obtained through the prediction model. Finally, a composite gradient NiTi is established based on the idea of rigid-flexible coupling, which successfully achieved the simultaneous improvement of the strength and toughness of the SLM-NiTi alloy. The compressive fracture strength reached 2668 MPa, and the fracture strain reached 55.51%.
ISSN:2238-7854

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