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FE-based development of highly wear resistant hot working tools by alloy modification in combination with a process- and material adapted nitriding layer

通过合金改性结合工艺和材料适应氮化层，基于有限元开发高耐磨热加工工具

基本信息

批准号：
260050454
负责人：
Professor Dr.-Ing. Bernd-Arno Behrens
金额：
--
依托单位：
Institut für Umformtechnik und Umformmaschinen (IFUM)
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2014
资助国家：
德国
起止时间：
2013-12-31 至 2016-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/260050454?language=en
关键词：
FE based development highly wear

项目摘要

Within the applied research project adapted hot working tools for the special requirements in hot forming processes will be developed by realizing an adapted alloy modification in combination with a process- and material adapted nitriding layer. By controlled process guiding during the nitriding process defined nitriding layers will be adjusted to investigate the influence of the nitriding depth and hardness gradient on the tool performance. To adjust defined and reproducible nitrding layers the plasma nitriding process will be used. The alloy modification bases on previous research works. Here, a standard hot working steel will be alloyed with additional amounts of manganese to increase the effect of the cyclic edge layer hardening by lowering the austenitic temperature Ac1b.The time- and temperature depending hardness profile of forging tools has a significant influence on the wear resistance. The surface temperature of the dies increases highly during the forming process of raw parts with a temperature of up to 1200 °C. The surface temperature plays a decisive role on the contribution of thermal energy into the tools. An experimental measurement of the surface temperature is not possible due to the high working loads in the contact zone. Therefore, alternative experimental and numerical methods will be used within the project for a holistically consideration of the edge layer phenomena. To characterize the hardening behavior of the tools time and temperature depending hardness profiles will be identified by dilatometer tests. To use the real and process depending temperature profiles for this test, a numerical and experimental determination of the temperature profile in the edge layer of the tools will be performed. For this purpose, thermocouple elements will be positioned near the surface zones of the dies with varying depth and the temperature profiles as a result of the forging process will be determined. With this data the numerically calculated temperature profiles will be validated and the development of the surface temperature will be calculated. The surface temperature will be used as an input value for the measurements in the dilatometer. After the dilatometer tests, the serial forging tests will be conducted on an industry related automated forging line. Analogous to the cycle times in the dilatometer tests wear measurements will be performed after the forging tests. This approach allows the investigation of the transferability of the experimentally investigated hardness profile with the wear rates measured out of the serial forging tests. The data gained within the project will be used, to expand an existing FE-based wear model considering the time- and temperature depending hardness gradient.

在应用研究项目中，将通过实现与工艺和材料相适应的氮化层相结合的适应性合金改性，开发适合热成形工艺特殊要求的热加工工具。在渗氮过程中，通过控制工艺指导，调整定义的渗氮层，以研究渗氮深度和硬度梯度对刀具性能的影响。为了调整定义的和可重复的氮化层，将使用等离子体氮化工艺。合金变质是在前人研究工作的基础上进行的。在这里，标准热作钢将与额外量的锰合金化，以通过降低奥氏体温度Ac1b来增加循环边缘层硬化的效果。锻造工具的时间和温度依赖性硬度曲线对耐磨性具有显著影响。在原始零件的成型过程中，模具的表面温度会大幅升高，温度高达1200 °C。表面温度对热能进入刀具的贡献起着决定性的作用。由于接触区的工作负荷很高，因此无法进行表面温度的实验测量。因此，替代的实验和数值方法将用于该项目的整体考虑的边缘层现象。为了表征工具的硬化行为，将通过硬度计测试来确定取决于时间和温度的硬度曲线。为了使用该测试的真实的和工艺相关温度分布，将对工具边缘层中的温度分布进行数值和实验测定。为此，热电偶元件将被定位在具有不同深度的模具的表面区域附近，并且作为锻造过程的结果的温度曲线将被确定。利用这些数据，将验证数值计算的温度分布，并计算表面温度的发展。表面温度将用作温度计测量的输入值。在硬度计测试之后，将在工业相关的自动锻造生产线上进行系列锻造测试。与磨损计测试中的循环时间类似，将在锻造测试后进行磨损测量。这种方法允许的实验研究的硬度分布与磨损率测量出的系列锻造试验的可转移性的调查。在项目中获得的数据将用于扩展现有的基于有限元的磨损模型，考虑时间和温度依赖的硬度梯度。