Functionally graded structures from high manganese iron based alloys - From TWIP effect to superelasticity

高锰铁基合金的功能梯度结构 - 从 TWIP 效应到超弹性

• 批准号: 250216343
• 负责人: Professor Dr.-Ing. Thomas Niendorf
• 金额: --
• 依托单位: Fachgebiet Metallische Werkstoffe
• 依托单位国家: 德国
• 项目类别: Independent Junior Research Groups
• 财政年份: 2014
• 资助国家: 德国
• 起止时间: 2013-12-31 至 2019-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/250216343?language=en
• 关键词: Functionally; graded; structures; manganese; iron

Current alloys and processes have to meet challenging requirements. In the light of resource efficiency light-weight design is of utmost relevance. For this reason materials of high specific strength are numerously employed. Tailoring of local properties allows for a further improvement of the light-weight potential of these high performance alloys. It is possible to tailor local material properties in such way that the requirements set by the local loading situation are perfectly accomplished. This can be obtained by manipulation of geometry, microstructure and chemical composition. Not only strength and ductility can be affected, functionalization of the material is possible as well. The latter can be achieved e.g. by use of an alloy showing shape memory behavior.Another important aspect for future manufacturing processes is freedom of design. Individualized components can be excellently produced by additive manufacturing. By use of locally optimized parameters during layer-wise manufacturing high performance graded structures can be obtained.The research project applied for aims in the establishment of functionally graded structures that combine all aforementioned aspects in a perfect way, i.e. that are characterized by geometrical, microstructural and functional gradation simultaneously. In consequence, materials showing unprecedented properties will be producible. The material of choice, high-manganese iron based alloy, allows for activation of different deformation mechanisms. In addition to slip transformation- and twinning-induced plasticity (TRIP/TWIP) as well as superelasticity can be present in these systems. Based on a composition showing shape memory characteristics, alloys showing TRIP/TWIP will be developed. These alloys will be microstructurally graded in such way, that e.g. crack advance under cyclic loading can be stopped. Superelasticity in the shape memory alloy will allow for manufacturing parts with high internal damping characteristics. Additionally, geometric gradation will allow for a perfect synthesis of all effects in a single part.In order to be able to achieve the visionary aim of the current project, the structures have to be necessarily produced by additive manufacturing. Electron beam melting (EBM) will be employed since only this technique will avoid changes of the chemical composition of the materials.A thorough experimental approach, employing mechanical characterization under monotonic and cyclic load accompanied by intense microstructure analyses, in part in an in-situ fashion, will allow for solid conclusions regarding the high potential of the above mentioned processes to be used for manufacturing of functionally graded components made from iron-manganese based alloys.

当前的合金和工艺必须满足具有挑战性的要求。鉴于资源效率，轻量化设计至关重要。因此，大量使用比强度高的材料。局部特性的定制允许进一步改善这些高性能合金的轻质潜力。可以定制局部材料特性，从而完美地满足局部负载情况所设定的要求。这可以通过操纵几何形状、微观结构和化学成分来获得。不仅强度和延展性会受到影响，材料的功能化也是可能的。后者可以通过例如使用具有形状记忆特性的合金来实现。未来制造工艺的另一个重要方面是设计的自由度。通过增材制造可以出色地生产个性化组件。本研究旨在建立一种联合收割机，即同时具有几何、微观和功能梯度特征的功能梯度结构。因此，显示出前所未有的性能的材料将是可生产的。选择的材料，高锰铁基合金，允许激活不同的变形机制。除了滑移相变和孪晶诱导塑性（TRIP/TIPs）以及超弹性可以存在于这些系统中。基于显示形状记忆特性的成分，将开发显示TRIP/TdR的合金。这些合金将以这样的方式进行微观结构分级，例如，可以阻止循环载荷下的裂纹前进。形状记忆合金中的超弹性将允许制造具有高内部阻尼特性的部件。此外，几何渐变将允许在单个部件中完美合成所有效果。为了能够实现当前项目的愿景目标，必须通过增材制造来生产结构。将采用电子束熔化（EBM），因为只有这种技术才能避免材料化学成分的变化。一种彻底的实验方法，采用单调和循环载荷下的机械特性，并伴随着强烈的微观结构分析，部分以原位方式，将允许关于上述工艺用于制造功能梯度部件的高潜力的可靠结论由铁锰基合金制成。

项目成果

Electron beam welding of Fe–Mn–Al–Ni shape memory alloy: Microstructure evolution and shape memory response

• DOI: 10.1142/s1793604717500436
• 发表时间: 2017-08
• 期刊: Functional Materials Letters
• 影响因子: 1.3
• 作者: P. Krooß;J. Günther;Lars Halbauer;M. Vollmer;A. Buchwalder;R. Zenker;H. Biermann;T. Niendorf

Cyclic deformation behavior of a damage tolerant CrMnNi TRIP steel produced by electron beam melting

• DOI: 10.1016/j.ijfatigue.2018.05.031
• 发表时间: 2018-09-01
• 期刊: INTERNATIONAL JOURNAL OF FATIGUE
• 影响因子: 6
• 作者: Droste, M.;Guenther, J.;Biermann, H.
• 通讯作者: Biermann, H.

On the effect of titanium on quenching sensitivity and pseudoelastic response in Fe-Mn-Al-Ni-base shape memory alloy

钛对Fe-Mn-Al-Ni基形状记忆合金淬火敏感性和拟弹性响应的影响

• DOI: 10.1016/j.scriptamat.2016.08.002
• 发表时间: 2017
• 期刊: Scripta Materialia
• 影响因子: 6
• 作者: M. Vollmer;P. Krooß;I. Karaman;T. Niendorf
• 通讯作者: T. Niendorf

Effect of Compositional Variation Induced by EBM Processing on Deformation Behavior and Phase Stability of Austenitic Cr-Mn-Ni TRIP Steel

• DOI: 10.1007/s11837-020-04018-6
• 发表时间: 2020-01-24
• 期刊: JOM
• 影响因子: 2.6
• 作者: Guenther, J.;Lehnert, R.;Niendorf, T.
• 通讯作者: Niendorf, T.

On the effect of gamma phase formation on the pseudoelastic performance of polycrystalline Fe–Mn–Al–Ni shape memory alloys

• DOI: 10.1016/j.scriptamat.2015.06.013
• 发表时间: 2015-11
• 期刊: Scripta Materialia
• 影响因子: 6
• 作者: M. Vollmer;C. Segel;P. Krooss;J. Günther;L. Tseng;I. Karaman;A. Weidner;H. Biermann;T. Niendorf