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Combined surface treatment for generation of multi functional surface by means of electron beam cladding (EBC) and thermochemical treatment (TCT) on an austenitic corrosion resistant steel (KomET)

通过电子束熔覆 (EBC) 和热化学处理 (TCT) 对奥氏体耐腐蚀钢 (KomET) 进行组合表面处理，生成多功能表面

基本信息

批准号：
319182474
负责人：
Professor Dr.-Ing. Rolf Zenker
金额：
--
依托单位：
Institut für Werkstofftechnik
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2016
资助国家：
德国
起止时间：
2015-12-31 至 2018-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/319182474?language=en
关键词：
Combined surface treatment generation multi

项目摘要

Corrosion resistant steels are distinguished by an excellent corrosion resistance, but are afflicted with considerably limitations related to wear resistance. Numerous treatments to eliminate these disadvantages led only partially to positive results. The submitted project is based on a combined surface treatment with an electron beam cladding (EBC) as first process step and a subsequent plasma nitrocarburizing (PNC). Own preliminary investigations showed that in principle it is possibly to raise hardness and wear resistance and to maintain the corrosion resistance at one. Aim of the project is to generate layer/matrix compounds useable under increased loading conditions in corrosive media. Using the example of steel X6CrNiMoTi17-12-2 initially there are to indentify optimum EB parameters to produce one- but especially multi-pass Co-based EBC coatings, free of cracks and pores, as well as a faultless metallurgical connection. Hardness and wear resistance should be improved considerably. The corrosion resistance at least should be nearly the same as that of base material. Basis for these investigations is one selected Co-base additive, which have to be investigated concerning the effect of Cr and Fe content on EBA coating formation (microstructure) and the degree of mix up , i.e. the element content of the prior deposited cladding layer, especially in the multi-pass EBA coating. In connection with the combination EBC+PNC, the metallurgical compatibility and the effect of coating configuration (microstructure) on the mechanisms of PNC layer formation in relation to a compact material as well as the supporting effect of the EBA coating for the subsequently generated thin PNC layer (expanded austenite) should be methodically investigated. The occurring processes during EBA (interaction EB/material) respectively PNC (N/C layer formation on Co-base EBA coating) will be fundamentally analyzed and interpreted. On the basis of selected reference specimens the load characteristic of the layer/matrix compounds, i. e. which wear and corrosion mechanisms occur in case of different application specific load conditions will be basically investigated. For that purpose should be carried out wear tests (Tribometer) on different load levels (normal force 5-500 N) and/or at different temperatures (24-300 °C) as well as corrosion tests in different acid media (potentiodynamic measurements in 0.05M acid sulfur, and long term tests in 30% citric acid or 20% acid sulfur). In result of the project should be obtained new basic knowledge about the project relevant combined surface treatment and created generalized conclusions for the process design.

耐腐蚀钢的特点是具有优异的耐腐蚀性，但在耐磨性方面受到相当大的限制。为消除这些缺点而采取的许多治疗方法仅部分取得了积极的结果。提交的项目基于电子束熔覆（EBC）作为第一个工艺步骤和随后的等离子体氮碳共渗（PNC）的组合表面处理。自己的初步研究表明，原则上可以提高硬度和耐磨性，并将耐腐蚀性保持在1。该项目的目的是生成可在腐蚀性介质中增加的负载条件下使用的层/基体化合物。以 X6CrNiMoTi17-12-2 钢为例，首先需要确定最佳 EB 参数，以生产单道次尤其是多道次的钴基 EBC 涂层，无裂纹和气孔，并且具有完美的冶金连接。硬度和耐磨性应显着提高。耐腐蚀性至少应与基材基本相同。这些研究的基础是一种选定的钴基添加剂，必须研究 Cr 和 Fe 含量对 EBA 涂层形成（微观结构）的影响以及混合程度，即先前沉积的熔覆层的元素含量，特别是在多道 EBA 涂层中。与 EBC+PNC 组合相关，应系统地研究冶金相容性、涂层配置（微观结构）对致密材料 PNC 层形成机制的影响，以及 EBA 涂层对随后生成的薄 PNC 层（膨胀奥氏体）的支撑作用。将从根本上分析和解释 EBA（EB/材料相互作用）和 PNC（钴基 EBA 涂层上 N/C 层形成）过程中发生的过程。根据选定的参考样本，层/基体化合物的负载特性，即。 e.将基本上研究在不同应用特定载荷条件下发生的磨损和腐蚀机制。为此，应在不同负载水平（法向力 5-500 N）和/或不同温度（24-300 °C）下进行磨损试验（摩擦试验机），以及在不同酸性介质中进行腐蚀试验（在 0.05M 酸性硫中进行动电位测量，以及在 30% 柠檬酸或 20% 酸性硫中进行长期测试）。通过项目的结果，应获得有关项目相关组合表面处理的新的基础知识，并为工艺设计创建概括性结论。