The Effect of Wall Thickness and Scanning Speed on the Martensitic Transformation and Tensile Properties of Selective Laser Melted NiTi Thin-Wall Structures

Guo, Fangmin; Guo, Yanbao; Kong, Xiangguang; Xiong, Zhiwei; Hao, Shijie

doi:10.3390/met12030519

Open AccessArticle

The Effect of Wall Thickness and Scanning Speed on the Martensitic Transformation and Tensile Properties of Selective Laser Melted NiTi Thin-Wall Structures

by

Fangmin Guo

^1,2

,

Yanbao Guo

^1,*,

Xiangguang Kong

²,

Zhiwei Xiong

² and

Shijie Hao

^2,*

¹

College of Mechanical and Transportation Engineering, China University of Petroleum, Beijing 102249, China

²

College of New Energy and Materials, China University of Petroleum, Beijing 102249, China

^*

Authors to whom correspondence should be addressed.

Metals 2022, 12(3), 519; https://doi.org/10.3390/met12030519

Submission received: 15 January 2022 / Revised: 12 March 2022 / Accepted: 17 March 2022 / Published: 18 March 2022

(This article belongs to the Special Issue Shape Memory Alloys 2022)

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Abstract

In this study, we analyzed the coupling effect of laser scanning speed and wall thickness on the phase transformation behavior and tensile properties of selective laser melted NiTi thin-wall structures. It is demonstrated that either scanning speed or wall thickness has their respective influence rule, whereas this influence could be changed when coupling them together; that is, under different scanning speeds, the effect of wall thickness could be different. It is found that the deviation of phase transformation temperature among different wall thicknesses is ~3.7 °C at 400 mm/s, while this deviation increases to ~23.5 °C at 600 mm/s. However, the deviation of phase transformation peak width among different wall thicknesses shows little change under different scanning speeds. At low scanning speed, the samples with thicker wall thickness exhibit better tensile ductility than thinner, whereas they all show poor tensile properties and brittle behavior at high scanning speed. This uncertain influence rule is mainly due to the interaction effect between different thermal histories generated by wall thickness and scanning speed.

Keywords: selective laser melting; NiTi shape memory alloy; laser scanning speed; thin-wall structure; martensitic transformation

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MDPI and ACS Style

Guo, F.; Guo, Y.; Kong, X.; Xiong, Z.; Hao, S. The Effect of Wall Thickness and Scanning Speed on the Martensitic Transformation and Tensile Properties of Selective Laser Melted NiTi Thin-Wall Structures. Metals 2022, 12, 519. https://doi.org/10.3390/met12030519

AMA Style

Guo F, Guo Y, Kong X, Xiong Z, Hao S. The Effect of Wall Thickness and Scanning Speed on the Martensitic Transformation and Tensile Properties of Selective Laser Melted NiTi Thin-Wall Structures. Metals. 2022; 12(3):519. https://doi.org/10.3390/met12030519

Chicago/Turabian Style

Guo, Fangmin, Yanbao Guo, Xiangguang Kong, Zhiwei Xiong, and Shijie Hao. 2022. "The Effect of Wall Thickness and Scanning Speed on the Martensitic Transformation and Tensile Properties of Selective Laser Melted NiTi Thin-Wall Structures" Metals 12, no. 3: 519. https://doi.org/10.3390/met12030519

APA Style

Guo, F., Guo, Y., Kong, X., Xiong, Z., & Hao, S. (2022). The Effect of Wall Thickness and Scanning Speed on the Martensitic Transformation and Tensile Properties of Selective Laser Melted NiTi Thin-Wall Structures. Metals, 12(3), 519. https://doi.org/10.3390/met12030519

Note that from the first issue of 2016, this journal uses article numbers instead of page numbers. See further details here.

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The Effect of Wall Thickness and Scanning Speed on the Martensitic Transformation and Tensile Properties of Selective Laser Melted NiTi Thin-Wall Structures

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