Sintering of prealloyed PM-steels and wear resistant MMC under consideration of gas-solid interaction

考虑气固相互作用的预合金粉末冶金钢和耐磨MMC的烧结

• 批准号: 86463846
• 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: 2008
• 资助国家: 德国
• 起止时间: 2007-12-31 至 2014-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/86463846?language=en
• 关键词: Sintering; prealloyed; PM; steels; wear

In the frame of the first funding period of the project Sintering of prealloyed PM-steels and wear resistant MMC under consideration of gas-solid interaction the influence of a nitrogen containing atmosphere on the sintering behavior and the mechanical properties of sintered parts was investigated. The objective was to gain knowledge about fundamental processes of the powder material during gas-solid interaction. This knowledge shall be used to optimize the process and/or the materials. In this context, the processes on the surface and in the bulk of the powder grain of two different cold work tool steels, one hot work tool steel and one CrMn austenitic stainless steel were investigated. One main topic of the second funding period is to complement the obtained results with two new materials, a duplex stainless steel and a powder metallurgically produced metal matrix composite material (PM-MMC). The matrix material for the PM-MMC is the extensively analyzed CrMn austenitic stainless steel. On the one hand, the PM-MMC combines the knowledge about the carbide-rich cold work tool steels and the single phase austenitic steel. On the other hand, nitrogen as alloying element is of great technical relevance in the field of duplex steels. The objective is to clarify the influence of the atmosphere on the processes on the surface (reduction) and in the bulk (phase transformation, phase composition, etc.) of the powder grains.The second main topic is to use the obtained fundamental results of the first funding period for optimization of processes with technical relevance:In the case of the austenitic stainless steel the focus lies on the enhancement of strength and corrosion resistance by realizing an optimal C/N-ratio combined with full densification. For this purpose the processing route (temperature and atmospheric control) shall be optimized regarding densification, bulk nitrogen concentration, and reduction processes.In case of the cold work tool steels sintering under nitrogen containing atmosphere decreases the solidus temperature of the material. This effect can be explained by the transformation of the vanadium-rich carbides to carbonitrides resulting in a release of carbon to the metallic matrix. The ambition is to design a thermal treatment (temperature and atmospheric control) which combines the beneficial effect of an N2 atmosphere while simultaneously optimizing the hardenability of the investigated steels.The research project is aimed to further establish gas-solid interaction for nitrogen alloying in order to optimize mechanical, corrosive, and tribological properties as well as processing parameters of different high alloyed steels.

在考虑到气体固体相互作用的抗固定性PM步骤和佩戴耐药的MMC的项目烧结的第一个融资期间，研究了含氮大气对烧结行为的影响和烧结部件的机械性能的影响。目的是获取有关气体固体相互作用期间粉末材料基本过程的知识。该知识应用于优化过程和/或材料。在这种情况下，研究了研究表面和大部分的两个不同冷工作工具钢的粉末颗粒，一个热工作工具钢和一个CRMN奥氏体不锈钢。第二个资金期间的一个主要主题是用两种新材料（双链不锈钢和粉末冶金产生的金属基质复合材料（PM-MMC））补充所获得的结果。 PMMC的基质材料是对CRMN奥氏体不锈钢的广泛分析。一方面，PM-MMC结合了有关碳化物富含碳化物的冷工作工具钢和单相奥氏体钢的知识。另一方面，作为合金元素，氮在双工钢领域具有很大的技术相关性。 The objective is to clarify the influence of the atmosphere on the processes on the surface (reduction) and in the bulk (phase transformation, phase composition, etc.) of the powder grains.The second main topic is to use the obtained fundamental results of the first funding period for optimization of processes with technical relevance:In the case of the austenitic stainless steel the focus lies on the enhancement of strength and corrosion resistance by realizing an optimal C/N-ratio结合完整的致密化。为此，应针对致密化，大量的氮浓度和还原过程来优化加工途径（温度和大气控制）。在冷工作工具的情况下，在含氮气下烧结大气的情况下降低了材料的固体温度。可以通过将富含钒的碳化物转化为碳依氏甲酸酯，从而将碳释放到金属基质中来解释。野心是设计一种热处理（温度和大气控制），结合了N2大气的有益效果，同时优化了研究的钢的可靠性。该研究项目旨在进一步建立氮的固体相互作用，以便为了优化机械，腐蚀性和摩擦学性能以及不同的较高型参数，以优化机械，腐蚀性和摩擦学性质。

项目成果

Influence of Solution Nitriding of Supersolidus–Sintered Cold Work Tool Steels on their Hardenability

固溶氮化超固相线烧结冷作工具钢对其淬透性的影响

• DOI: 10.3139/105.110234
• 发表时间: 2014
• 期刊: HTM Journal of Heat Treatment and Materials
• 作者: M. Blüm;J. Conrads;S. Weber;W. Theisen
• 通讯作者: W. Theisen

Influence of the PM-Processing Route and Nitrogen Content on the Properties of Ni-Free Austenitic Stainless Steel

• DOI: 10.1007/s11661-014-2701-7
• 发表时间: 2015-03-01
• 期刊: METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
• 影响因子: 2.8
• 作者: Lefor, Kathrin;Walter, M.;Theisen, W.
• 通讯作者: Theisen, W.

Critical investigation of high temperature gas nitriding of a PM tool steel

粉末冶金工具钢高温气体渗氮的关键研究

• DOI: 10.3139/146.110447
• 发表时间: 2011
• 期刊: International Journal of Materials Research
• 影响因子: 0.8
• 作者: S. Weber;W. Theisen
• 通讯作者: W. Theisen