Influence of solution state and microstructure on the thermal and electrical conductivity of tool steels

固溶状态和显微组织对工具钢导热性和导电性的影响

• 批准号: 202401771
• 负责人: Professor Dr.-Ing. Werner Theisen
• 金额: --
• 依托单位: Lehrstuhl Werkstofftechnik
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2011
• 资助国家: 德国
• 起止时间: 2010-12-31 至 2016-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/202401771?language=en
• 关键词: Influence; solution; state; microstructure; thermal

Cold forming and hot forming are major applications of tool steels, for example in the scope of sheet forming and forging. Usually, development and selection of these steels consider technical aspects like tensile and compression strength or wear- and corrosion resistance, while physical properties like thermal and electrical conductivity are little-noticed. In the previous funding period, the influence of chemical composition and heat treatment condition on the conductivity of selected tool steels was analysed. The obtained results lead to the conclusion, that the solution state created with a heat treatment has a high impact on the thermal conductivity of tool steels, especially through the formation and solution of carbides. In the next step, the relation between carbide formation and conductivity has been investigated. Accordingly, the formation and coarsening of carbides, especially chrome-rich carbides, cause a considerably increased conductivity, decreasing the content of conductivity reducing alloying elements solved in the matrix. Additionally, basic principles of conduction in a copper infiltrated tool steel were investigated. These materials are capable of combining a high conductivity with good compression strength. During infiltration, the copper is impurified by iron, strongly reducing its conductivity. A well-directed heat treatment was found to be capable to reverse this effect to some extent.In the submitted research project, the gained findings are to be transferred to the technical application of press hardening. To accomplish this, instrumented hot forming experiments with in-tool quenching shall take place. The used tools will have a conductivity tuned by heat treatment, enabling the correlation of tool conductivity with the produced parts mechanical properties. Especially, partial heat treatment of tools and functional infiltrated layers added to the tools are to be investigated. Due to the locally adjusted heat conductivity of the tools, the produced parts can obtain graded mechanical properties.Though, deeper investigation of factors influencing conductivity of tool steels is needed. This includes the conductivity of temper carbides as well as the influence of short-time heat treatment on the conductivity of tool steels. Regarding the copper infiltrated steels, the kinetic of formation and coarsening of iron precipitates in the copper and the increase of the strength are focused.

冷的形成和热形成是工具钢的主要应用，例如在薄板形成和锻造的范围中。通常，这些钢的开发和选择考虑了技术方面，例如拉伸和压缩强度或磨损和耐腐蚀性，而诸如热电导率之类的物理特性则鲜为人知。在上一个资金期间，分析了化学组成和热处理条件对选定工具钢电导率的影响。获得的结果得出的结论是，使用热处理产生的溶液状态对工具钢的导热率有很大影响，尤其是通过碳化物的形成和溶液。在下一步中，已经研究了碳化物形成与电导率之间的关系。因此，碳化物的形成和变高，尤其是富含铬的碳化物，导致电导率大大增加，从而降低了电导率的含量，从而减少了在基质中求解的合金元件。此外，研究了铜浸入工具钢中传导的基本原理。这些材料能够将高电导率与良好的压缩强度相结合。在浸润过程中，铜会被铁弹破，从而大大降低了其电导率。发现有良好的热处理能够在某种程度上扭转这种影响。在提交的研究项目中，获得的发现将转移到压力强硬的技术应用中。为了实现这一目标，应进行仪器的热形成实验。使用的工具将具有通过热处理调节的电导率，从而使刀具电导率与生产的零件机械性能相关。尤其是，应研究在工具中添加的工具和功能浸润层的部分热处理。由于工具的局部调节热电导率，生产的零件可以获得分级的机械性能。尽管需要更深入地研究影响工具钢电导率的因素。这包括碳化物的电导率以及短时热处理对工具钢电导率的影响。关于铜浸润的钢，铜中铁沉淀的形成和浓缩的动力学和强度的增加是集中的。

项目成果

Thermo-physical properties of heat-treatable steels in the temperature range relevant for hot-stamping applications

• DOI: 10.1007/s10853-015-8829-z
• 发表时间: 2015-01
• 期刊: Journal of Materials Science
• 影响因子: 4.5
• 作者: Jakob Kuepferle;J. Wilzer;S. Weber;W. Theisen

Effect of heat treatment on phase structure and thermal conductivity of a copper-infiltrated steel

• DOI: 10.1007/s10853-015-8919-y
• 发表时间: 2015-05-01
• 期刊: JOURNAL OF MATERIALS SCIENCE
• 影响因子: 4.5
• 作者: Klein, S.;Weber, S.;Theisen, W.
• 通讯作者: Theisen, W.

The influence of heat treatment and resulting microstructures on the thermophysical properties of martensitic steels

• DOI: 10.1007/s10853-013-7665-2
• 发表时间: 2013-12-01
• 期刊: JOURNAL OF MATERIALS SCIENCE
• 影响因子: 4.5
• 作者: Wilzer, Jens;Luedtke, Fabian;Theisen, Werner
• 通讯作者: Theisen, Werner

Thermal conductivity of advanced TiC reinforced metal matrix composites for polymer processing applications

• DOI: 10.1177/0021998313516143
• 发表时间: 2015-01
• 期刊: Journal of Composite Materials
• 影响因子: 2.9
• 作者: J. Wilzer;M. Windmann;S. Weber;H. Hill;A. V. Bennekom;W. Theisen

Carbide Precipitation During Tempering of a Tool Steel Subjected to Deep Cryogenic Treatment

• DOI: 10.1007/s11661-014-2202-8
• 发表时间: 2014-05-01
• 期刊: METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
• 影响因子: 2.8
• 作者: Gavriljuk, V. G.;Sirosh, V. A.;Kortmann, A.
• 通讯作者: Kortmann, A.