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首页> 外文期刊>International Journal of Microstructure and Materials Properties >On adhesion of work material in metal forming
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On adhesion of work material in metal forming

机译：关于工件在金属成型中的附着力

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摘要

The transfer of work material to the tool surface limits the tool life in many forming operations. Using a dedicated load-scanning test equipment with crossed-cylinder geometry, dry forming of austenitic stainless steel was simulated by provoking adhesion to the TiN-coated tool specimen. High-resolution electron microscopy combined with analytical techniques was used to examine the interface between tool and work material. The decisive mechanism for adhesion and transfer of steel to the TiN surface is suggested. The oxide layer on the steel surface, especially the Fe-oxide, initiates the metal transfer. The interfacial oxide acts as a glue between stainless steel and TiN and increases the adhesive forces. Obviously, the adhesion and internal strength of the oxide layer is far stronger than anticipated. It may even be stronger than the bonding to the austenitic steel itself. A consequence of these findings is that the development of galling resistance-forming tool materials and coatings for austenitic stainless steels should not only aim to improve the bulk tool material, but also to reduce the adhesion strength between the tool surface and the oxide layer on the work material.
机译：将工作材料转移到工具表面会限制许多成型操作中工具的寿命。使用具有交叉圆柱体几何形状的专用载荷扫描测试设备，通过引起与TiN涂层工具样品的附着力，模拟了奥氏体不锈钢的干式成型。高分辨率电子显微镜结合分析技术被用来检查工具和工作材料之间的界面。提出了将钢粘附和转移到TiN表面的决定性机制。钢表面的氧化物层，尤其是铁氧化物，开始金属转移。界面氧化物充当不锈钢和TiN之间的胶水，并增加了粘合力。显然，氧化物层的粘附力和内部强度远强于预期。它甚至可能比与奥氏体钢本身的结合更牢固。这些发现的结果是，开发用于奥氏体不锈钢的形成抗磨损性的工具材料和涂层的目的不仅在于改善整体工具材料，而且还应降低工具表面与金属表面氧化层之间的粘附强度。工作材料。

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