Influence of ageing treatment on the thermophysical characteristics and mechanical properties of forging wire Ni-rich NiTi alloy for superelastic applications

P.F. Rodrigues , F.M.B. Fernandes , E.N. Texeira , S. Baptista , A.S. Paula , J.P. Oliveira
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引用次数: 5

Abstract

NiTi alloys used for orthodontic applications need to show superelastic characteristics at room and oral temperatures. The ideal scenario is that where the material has a final austenitic phase transformation value below the room temperature. This study aims at understanding the influence of the ageing treatments in the austenitic structure at room temperature on a wire of a Ni-rich NiTi alloy produced by rotary forging by the evaluation of the phase transformation temperatures and mechanical behaviour in order to promote the superelastic behaviour at room temperature. The investigation was conducted using DSC (Differential Scanning Calorimetry) analysis and instrumented ultramicrohardness. The solubilisation at 950 °C for 120 min with water quenching showed a satisfactory amount of B2 phase at room temperature when compared to the sample after forging. After solubilisation, ageing treatment at 350 °C for 30 min gave a relatively higher hardness value and an Af temperature below the room temperature, ensuring the presence of austenitic phase at room and oral temperatures.

时效处理对超弹性锻丝富镍NiTi合金热物理特性和力学性能的影响
用于正畸应用的NiTi合金需要在室温和口腔温度下显示超弹性特性。理想的情况是材料的最终奥氏体相变值低于室温。本研究旨在通过评价奥氏体组织室温时效处理对一种富镍NiTi合金旋转锻造线材的相变温度和力学行为的影响,以促进其室温超弹性行为。研究采用DSC(差示扫描量热法)分析和仪器超显微硬度。在950℃水淬120 min的溶解过程中,与锻造后的样品相比,室温下的B2相数量令人满意。增溶后,在350°C下进行30分钟时效处理,硬度值相对较高,Af温度低于室温,确保室温和口腔温度下奥氏体相的存在。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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