Investigation on Microstructure and Properties of Selective Laser Melting Ni50.8Ti49.2 Shape Memory Alloys

被引：0
|
作者：
Wang S. [1 ]
Feng Y. [1 ]
Lin X. [1 ]
机构：
[1] State Key Laboratory of Solidification Technology, Northwestern Polytechnical University, Xi'an
来源：
Jixie Gongcheng Xuebao/Journal of Mechanical Engineering | 2020年 / 56卷 / 15期
关键词：
Mechanical properties; Microstructure; Selective laser melting(SLM); Shape memory alloy(SMA); Superelasticity;
D O I：
10.3901/JME.2020.15.046
中图分类号：
学科分类号：
摘要：
The energy input per unit volume changes with the laser power and scanning rate. The change of the process parameters on the influence of microstructure and properties of the selective laser melting (SLM) is investigated for the as-deposited Ni50.8Ti49.2. Considering the influence of different energy inputs on the sample microstructure of the scanning direction (SD) and deposition direction (BD), samples are observed by optical microscopy, it was found that with the increase of energy input, the defects of the metallographic structure gradually decreased along the deposition direction. The microstructure evolved from short, thick columnar crystals to slender columnar crystals. Phase constitution at room temperature is investigated by XRD. Most of the samples are B2 parent phase at room temperature, and some samples contained a small amount of Ti3Ni4 phase. At the same time, the microhardness test of the sample shows that the introduction of Ti3Ni4 phase increases the microhardness value in addition to the laser power. The transformation temperatures of different samples are investigated by differential scanning calorimetry(DSC). The cylindrical samples were subjected to compression test using a universal testing machine. The results show that the fracture strain of the sample was up to 42%, and the fracture strain of the high energy input sample is slightly lower. The superelasticity at room temperature increases significantly with the increase of energy input. When the compression strain is 10%, the superelastic recovery rate is as high as 90.2%. © 2020 Journal of Mechanical Engineering.
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页码：46 / 52
页数：6
相关论文
共 18 条
  • [1] LIU Yinong, ZHENG Yufeng, LIU Yinong, Engineering titanium nickel alloy, (2014)
  • [2] MEIER H, HABERLAND C., Experimental studies on selective laser melting of metallic parts, Materials Science and Materials Engineering, 39, 9, pp. 665-670, (2008)
  • [3] SAEDI S, MOGHADDAM N S, AMERINATANZI A, Et al., On the effects of SLM process parameters on microstructure and thermomechanical response of Ni-rich NiTi SMAs, Acta Materialia, 144, pp. 552-560, (2018)
  • [4] HABERLAND C, ELAHINIA M, WALKER J M, Et al., On the development of high quality NiTi shape memory and pseudoelastic parts by additive manufacturing, Smart Materials and Structures, 23, 10, (2014)
  • [5] SHIVA S, PALANI I A, MISHRA S K, Et al., Investigations on the influence of composition in the development of Ni-Ti shape memory alloy using laser based additive manufacturing, Optics & Laser Technology, 69, pp. 44-51, (2015)
  • [6] MEIER H, HABERLAND C, FRENZEL J., Structural and functional properties of NiTi shape memory alloys produced by selective laser melting, Innovative Developments in Design and Manufacturing: Advanced Research in Virtual and Rapid Prototyping, pp. 291-296, (2011)
  • [7] Li Ruidi, Research on the key basic issues in selective laser melting of metallic powder, (2010)
  • [8] ELAHINIA M, SHAYESTEHMOGHADDAM N, TAHERI A M, Et al., Fabrication of NiTi through additive manufacturing: A review, Progress in Materials Science, 83, pp. 630-663, (2016)
  • [9] LORE T, KAROLIEN K, JEAN P K, Et al., Fine-structured aluminium products with controllable texture by selective laser melting of pre-alloyed AlSi10Mg powder, Acta Materialia, 61, 5, pp. 1809-1819, (2013)
  • [10] LOH LE, CHUA CK, YEONG W Y, Et al., Numerical investigation and an effective modelling on the Selective laser melting (SLM) process with aluminium alloy 6061, International Journal of Heat and Mass Transfer, 80, pp. 288-300, (2015)
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