Abstract 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.

中文翻译：

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SLM工艺参数对富镍镍钛合金微结构和热机械响应的影响

摘要 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。本研究集中于激光功率和扫描速度变化对 Ni50.8Ti49.2 的微观结构、转变温度、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。与用高激光功率处理的样品相比，用低激光功率处理的样品显示出显着更高的应变恢复和更低的机械滞后。结果表明，使用相同能量水平制造的样品，使用不同加工参数的组合，每个都显示出独特的响应。激光功率为 100 W，扫描速度为 125 mm/s 的样品在第一次循环中表现出近乎完美的超弹性，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。