Quenching and Deformation Dilatometer

淬火变形膨胀仪

• 批准号: 514897779
• 金额: --
• 依托单位: Universität Rostock
• 依托单位国家: 德国
• 项目类别: Major Research Instrumentation
• 财政年份: 2022
• 资助国家: 德国
• 起止时间: 2021-12-31 至 2022-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/514897779?language=en
• 关键词: Quenching; Deformation; Dilatometer

The quenching and deformation dilatometer can be used in different operating modes. In the quenching mode, rapid inductive heating of metallic samples with heating rates of up to several 1000 K/s to temperatures of up to approx. 1500 °C and subsequent rapid quenching by means of a gas nozzle array with cooling rates of up to several 1000 K/s is possible. In parallel, the length change of the sample is measured. This allows the phase transformations during almost any heat treatment of metallic materials (which are associated with a sufficient volume change) to be monitored in-situ. In the deformation mode (compression or tension), these almost arbitrary heat treatments can be stopped at any time in order to characterise the material state present at the current temperature by its flow curve, even far from equilibrium (thermomechanical analysis). Metallic samples treated thermomechanically in this way can then be investigated with regard to their nanoscale material structure and serve as initial states for further thermal analyses by means of calorimetry.A new method integrated into dilatometry for the in-situ analysis of material structures is laser ultrasonic testing. Here, a sample surface is bombarded with a short laser pulse, which triggers an ultrasound wave inside the sample. The impact of this ultrasonic wave on the opposite sample surface is detected. Characteristics of the ultrasonic wave, such as the speed of sound and the attenuation, can be correlated with characteristics of the material structure. With this equipment, the proposed device has a unique selling point, which opens up completely new possibilities for the applicant to analyse phase transformations in-situ, which are associated with very small volume changes.The quenching and deformation dilatometer is thus an indispensable research device for the Chair of Materials Science at the University of Rostock with its research focus on metallic materials, heat treatment processes/equipment, heat treatment simulations and material data/material models for simulations. Heat treatment processes also include manufacturing processes that are intrinsically combined with heat treatment (e.g. casting, additive manufacturing, hot forming, joining). Current research projects in which the research equipment is to be used include precipitation hardening of Al alloys, twin-roll-casting of Al alloys, induction hardening of steels, inductive heat treatment of Ni-Ti alloys and additive manufacturing of Cu alloys. Planned research projects include additive manufacturing of Al alloys, case hardening of additively manufactured steels, superimposed artificial ageing and creep of Al alloys and sintering of high entropy alloys.

淬火和变形应变仪可用于不同的操作模式。在淬火模式下，金属样品的快速感应加热，加热速率高达1000 K/s，温度高达约100 ℃。1500 °C，随后通过气体喷嘴阵列进行快速淬火，冷却速率可达1000 K/s。同时，测量样品的长度变化。这允许在金属材料的几乎任何热处理期间的相变（其与足够的体积变化相关联）被原位监测。在变形模式（压缩或拉伸）中，这些几乎任意的热处理可以在任何时候停止，以便通过其流动曲线来描述当前温度下存在的材料状态，甚至远离平衡（热机械分析）。通过这种方式进行热机械处理的金属样品可以研究其纳米级材料结构，并作为通过量热法进行进一步热分析的初始状态。一种新的方法集成到用于材料结构原位分析的激光超声测试中。在这里，样品表面被短激光脉冲轰击，这会触发样品内部的超声波。检测该超声波对相对样品表面的影响。超声波的特性，例如声速和衰减，可以与材料结构的特性相关联。该设备具有独特的卖点，为申请人原位分析相变（体积变化非常小）提供了全新的可能性。因此，淬火和变形应变仪是罗斯托克大学材料科学系不可或缺的研究设备，其研究重点是金属材料、热处理工艺/设备，热处理模拟和用于模拟的材料数据/材料模型。热处理工艺还包括与热处理内在结合的制造工艺（例如铸造、增材制造、热成型、连接）。目前使用该研究设备的研究项目包括铝合金的沉淀硬化、铝合金的双辊铸造、钢的感应硬化、镍钛合金的感应热处理和铜合金的增材制造。计划的研究项目包括铝合金的增材制造，增材制造钢的表面硬化，铝合金的叠加人工时效和蠕变以及高熵合金的烧结。