W foil: Toughness - Identification of the mechanisms of the evolution of the activation energy of the brittle-to-ductile transition caused by cold rolling
W箔:韧性——冷轧引起的脆塑转变活化能演化机制的识别
基本信息
- 批准号:274714564
- 负责人:
- 金额:--
- 依托单位:
- 依托单位国家:德国
- 项目类别:Research Grants
- 财政年份:2015
- 资助国家:德国
- 起止时间:2014-12-31 至 2017-12-31
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
Up to now, tungsten (W) has only been used as a functional material, as its low fracture toughness at room temperature and its high brittle-to-ductile transition temperature (BDTT) exclude W from being used as a structural material. So here the question of how to make W ductile arises. The approach assessed by the author of this proposal is the synthesis of a W laminate made of W foil. Cold-rolled W foil has extraordinary properties in terms of ductility and toughness. Through the synthesis of a W laminate the author succeeded in transferring the properties of the foil to the bulk. Furthermore, the author produced W laminate pipes that are convincing due to their thermo-mechanical properties and are discussed with a view to being used as structural parts for innovative high-temperature energy conversion systems.Based on the work of the author on W laminate materials, several scientific questions arise. Within the framework of this proposal, the mechanism of the evolution of the activation energy of the brittle-to-ductile transition, HBDT, caused by cold rolling will be identified.Results on the BDT of W single crystals from ROBERTS and GUMBSCH are inconsistent and show no clear scientific model. This discrepancy continues for polycrystalline W materials. Here ROBERTS says that grain boundaries have no influence on the BDT, while simulation results from HARTMAIER show that very fine-grained W materials have a reduced rate dependence and thus an increased HBDT. The reason for this behaviour is the confinement of the plastic zone by grain boundaries. This confinement leads to dislocation pile-ups at the grain boundaries and thus reduced mobility. HARTMAIER now assumes that the HBDT might be a kind of dislocation-grain-boundary interaction energy (activation of slip systems in the neighbouring grains). However, according to this model, the fracture toughness would decrease through grain refinement and the BDTT would increase through grain refinement. But this is in conflict with the experimental results of PIPPAN and the author of this proposal.The aim of the project is to identify the mechanisms of the evolution of the activation energy of the brittle-to-ductile transition through cold rolling and to support the understanding and knowledge of the brittle-to-ductile transition of polycrystalline W. In doing this, the mechanisms are identified both in a direct manner through electron microscopy analyses (EBSD, HR-EBSD, KAM, ECCI, TEM) and in an indirect manner through the determination of the activation energy of the brittle-to-ductile transition. Finally, by comparing the results of the electron microscopy analyses with the evolution of the activation energy of the brittle-to-ductile transition, the conflicts in the models of HARTMAIER, ROBERTS, PIPPAN, as well as the author of this proposal, will be solved and a modified and mechanism-based model of the brittle-to-ductile transition of W will be presented.
到目前为止,钨(W)仅作为功能材料使用,因为其在室温下的低断裂韧性和高脆延性转变温度(BDTT)使其无法作为结构材料使用。那么问题来了,如何使W具有延展性。作者评估的方法是用W箔合成W层压板。冷轧W箔在延展性和韧性方面具有非凡的性能。通过合成W层压板,作者成功地将箔的性能转移到体上。此外,作者还生产了具有令人信服的热机械性能的W层压板管,并讨论了将其用作创新的高温能量转换系统的结构部件。基于作者对W层压板材料的工作,出现了几个科学问题。在本提案的框架内,将确定冷轧引起的脆性到韧性转变(HBDT)的活化能演变的机制。ROBERTS和GUMBSCH关于W单晶BDT的结果不一致,没有明确的科学模型。这种差异在多晶钨材料中继续存在。在这里,ROBERTS说晶界对BDT没有影响,而HARTMAIER的模拟结果表明,非常细粒度的W材料具有降低的速率依赖性,从而增加了HBDT。造成这种现象的原因是晶界限制了塑性区。这种约束导致位错在晶界处堆积,从而降低了迁移率。HARTMAIER现在假设HBDT可能是一种位错-晶界相互作用能(邻近晶粒中滑移系统的激活)。但根据该模型,晶粒细化会降低断裂韧性,晶粒细化会增加BDTT。但这与PIPPAN的实验结果和本提案的作者相矛盾。该项目的目的是确定冷轧过程中脆性到延性转变活化能演变的机制,并支持对多晶w脆性到延性转变的理解和认识。在此过程中,通过电子显微镜分析(EBSD, HR-EBSD, KAM, ECCI,TEM)和间接方式通过确定脆性到韧性转变的活化能。最后,通过将电镜分析结果与脆性-延性转变活化能的演化进行比较,解决了HARTMAIER、ROBERTS、PIPPAN以及本文作者模型中的矛盾,提出了一种修正的基于机理的W脆性-延性转变模型。
项目成果
期刊论文数量(3)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
Der Spröd-duktil-Übergang in ultrafeinkörnigem Wolfram
超细晶粒钨的脆性转变
- DOI:10.5445/ir/1000137407
- 发表时间:
- 期刊:
- 影响因子:0
- 作者:Bonnekoh;Carsten
- 通讯作者:Carsten
The brittle-to-ductile transition in cold rolled tungsten plates: Impact of crystallographic texture, grain size and dislocation density on the transition temperature
- DOI:10.1016/j.ijrmhm.2018.09.010
- 发表时间:2019-01-01
- 期刊:
- 影响因子:3.6
- 作者:Bonnekoh, Carsten;Jaentsch, Ute;Reiser, Jens
- 通讯作者:Reiser, Jens
{{
item.title }}
{{ item.translation_title }}
- DOI:
{{ item.doi }} - 发表时间:
{{ item.publish_year }} - 期刊:
- 影响因子:{{ item.factor }}
- 作者:
{{ item.authors }} - 通讯作者:
{{ item.author }}
数据更新时间:{{ journalArticles.updateTime }}
{{ item.title }}
- 作者:
{{ item.author }}
数据更新时间:{{ monograph.updateTime }}
{{ item.title }}
- 作者:
{{ item.author }}
数据更新时间:{{ sciAawards.updateTime }}
{{ item.title }}
- 作者:
{{ item.author }}
数据更新时间:{{ conferencePapers.updateTime }}
{{ item.title }}
- 作者:
{{ item.author }}
数据更新时间:{{ patent.updateTime }}
Dr.-Ing. Jens Reiser其他文献
Dr.-Ing. Jens Reiser的其他文献
{{
item.title }}
{{ item.translation_title }}
- DOI:
{{ item.doi }} - 发表时间:
{{ item.publish_year }} - 期刊:
- 影响因子:{{ item.factor }}
- 作者:
{{ item.authors }} - 通讯作者:
{{ item.author }}
{{ truncateString('Dr.-Ing. Jens Reiser', 18)}}的其他基金
W-foil: DuctilityIdentification of the mechanism of plastic deformation
W-箔:延展性塑性变形机制的识别
- 批准号:
250335026 - 财政年份:2013
- 资助金额:
-- - 项目类别:
Research Grants
相似海外基金
CAREER: Recycled Polymers of Enhanced Strength and Toughness: Predicting Failure and Unraveling Deformation to Enable Circular Transitions
职业:增强强度和韧性的再生聚合物:预测失效和解开变形以实现圆形过渡
- 批准号:
2338508 - 财政年份:2024
- 资助金额:
-- - 项目类别:
Standard Grant
Graph Edge Decomposition and Graph Toughness
图边分解和图韧性
- 批准号:
2345869 - 财政年份:2023
- 资助金额:
-- - 项目类别:
Standard Grant
Ionic Graft Polymers for Both High Strength and Toughness in Plastic Materials
在塑料材料中实现高强度和高韧性的离子接枝聚合物
- 批准号:
23K13802 - 财政年份:2023
- 资助金额:
-- - 项目类别:
Grant-in-Aid for Early-Career Scientists
The effect of hot rolling process parameters on the microstructure, toughness and damage evolution of High Strength Low Alloy (HSLA) steels
热轧工艺参数对高强度低合金(HSLA)钢显微组织、韧性和损伤演变的影响
- 批准号:
566520-2021 - 财政年份:2022
- 资助金额:
-- - 项目类别:
Alliance Grants
CAREER: Bottom-up construction of re-configurable entanglements toward polymer networks with switchable toughness
职业:自下而上构建具有可切换韧性的聚合物网络的可重新配置缠结
- 批准号:
2144288 - 财政年份:2022
- 资助金额:
-- - 项目类别:
Continuing Grant
SBIR Phase I: Multi-principal element alloy fillers for toughness enhancement in repair of Ni-base superalloy components
SBIR 第一阶段:用于镍基高温合金部件修复中增强韧性的多主元合金填料
- 批准号:
2208777 - 财政年份:2022
- 资助金额:
-- - 项目类别:
Standard Grant
Improved Evaluation Methods for Fatigue Life and Toughness Assessment of Steel Bridges
钢桥疲劳寿命和韧性评估的改进评价方法
- 批准号:
558769-2021 - 财政年份:2022
- 资助金额:
-- - 项目类别:
Postgraduate Scholarships - Doctoral
High-toughness and fatigue-resistant cathode particles for fast-charging lithium-ion batteries
快充锂离子电池用高韧性耐疲劳正极颗粒
- 批准号:
567843-2022 - 财政年份:2022
- 资助金额:
-- - 项目类别:
Postdoctoral Fellowships
Graph Edge Decomposition and Graph Toughness
图边分解和图韧性
- 批准号:
2153938 - 财政年份:2022
- 资助金额:
-- - 项目类别:
Standard Grant
Texture engineered high toughness pipeline steel for arctic environment
适用于北极环境的纹理工程高韧性管线钢
- 批准号:
549712-2019 - 财政年份:2022
- 资助金额:
-- - 项目类别:
Alliance Grants