On the effects of selective laser melting process parameters on microstructure and thermomechanical response of Ni-rich NiTi
On the effects of selective laser melting process parameters on microstructure and thermomechanical response of Ni-rich NiTi
复制标题
DOI：
10.1016/j.actamat.2017.10.072
复制
发表时间：
2018-02-01
期刊：
影响因子：
9.4
通讯作者：
Karaca, Haluk E.
中科院分区：
文献类型：
--
作者：
Saedi, Soheil;Moghaddam, Narges Shayesteh;Karaca, Haluk E.
选择性激光熔化制造工艺参数的任何变化都会影响最终产品的性能。研究了激光功率和扫描速度对Ni50.8Ti49.2合金的显微组织、相变温度、织构和形状记忆响应的影响。在这方面，系统地制造了多个样品，以证明仔细选择工艺参数可以制造出具有独特特征和行为的零件。与高功率激光处理的样品相比，低功率激光处理的样品具有更高的应变恢复率和更低的机械滞后。结果表明，在相同的能级下，使用不同的工艺参数组合制备的样品，每个样品都表现出独特的响应。当激光功率为100W，扫描速度为125 mm/S时，制备的样品具有几乎完全的超弹性，第一次循环的恢复率为96%，应变恢复率为5.77%。相应的稳定超弹性响应在10次循环后显示出5.5%的完全应变恢复。(C)2017 Acta Materialia Inc.由Elsevier Ltd.出版。保留所有权利。
Any variation in the processing parameters of selective laser melting fabrication could impact the performance of the final product. This study is concentrated on the effects of laser power and scanning speed alteration on the microstructure, transformation temperatures, texture, and shape memory response of Ni50.8Ti49.2. In this regard, multiple samples were systematically fabricated to demonstrate that careful selection of process parameters can lead to fabrication of parts with distinctive features and behaviors. The samples processed with low laser power showed significantly higher strain recovery and lower mechanical hysteresis compared to those processed with high laser power. It was demonstrated that the samples fabricated with same energy level, using a combination of different processing parameters each displayed unique responses. The sample fabricated with a laser power of 100 W and scanning speed of 125 mm/s exhibited almost perfect superelasticity with a recovery ratio of 96% and strain recovery of 5.77% in the first cycle. The corresponding stabilized superelastic response demonstrated full strain recovery of 5.5% after 10 cycles. (C) 2017 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.