Surface coating can greatly enhance the lifetime of cold extrusion die. It is a significant issue to evaluate the performance of coatings and even predict the lifetime of cold extrusion die. In this work, the titanium-based nitride coatings including TiN, TiAlN, and TiAlCrN were, respectively, deposited on the surface of high-speed steel substrate W 6 Mo 5 Cr 4 V 2 (M2) by the physical vapor deposition technology. The hardness test, scratch test, Rockwell adhesion test, and pin-on-disc (POD) wear test were carried out aiming to investigate the performances of the three coatings including hardness, adhesion strength, and wear resistance. The results show that the TiAlCrN coating exhibits the highest hardness of 3,033 HV in comparison with TiN coating (1,222 HV) and TiAlN coating (1,916 HV), while it possesses poor adhesion strength and inferior wear resistance. Furthermore, the TiAlN coating presents the highest resistance to wear and spalling from the substrate. In addition, the Archard wear model of the coatings was solved and applied in the finite element model of cold extrusion to calculate the wear depth and lifetime of the cold extrusion dies. The results suggest that TiAlN coating is the optimal option for cold extrusion die as compared with TiAlCrN and TiN coatings. TiAlN coating can prolong the lifetime of the substrate die up to 260%.

中文翻译：

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钛基金属氮化物涂层的性能评估和冷挤压过程中模具寿命的预测

表面涂层可以大大延长冷挤压模具的使用寿命。评估涂层的性能，甚至预测冷挤压模具的寿命是一个重要的问题。在这项工作中，通过物理气相沉积技术分别在高速钢基材W 6 Mo 5 Cr 4 V 2（M2）的表面上沉积了包括TiN，TiAlN和TiAlCrN的钛基氮化物涂层。进行了硬度测试，划痕测试，洛氏附着力测试和销钉圆盘（POD）磨损测试，目的是研究这三种涂层的性能，包括硬度，附着强度和耐磨性。结果表明，与TiN涂层（1,222 HV）和TiAlN涂层（1,916 HV）相比，TiAlCrN涂层的最高硬度为3,033 HV，同时它的粘合强度差，耐磨性差。此外，TiAlN涂层具有最高的耐磨性和抗剥落性。此外，解决了涂层的Archard磨损模型并将其应用于冷挤压的有限元模型中，以计算冷挤压模具的磨损深度和寿命。结果表明，与TiAlCrN和TiN涂层相比，TiAlN涂层是冷挤压模具的最佳选择。TiAlN涂层可将基材芯片的寿命延长至260％。解决了涂层的Archard磨损模型，并将其应用于冷挤压的有限元模型中，以计算冷挤压模具的磨损深度和寿命。结果表明，与TiAlCrN和TiN涂层相比，TiAlN涂层是冷挤压模具的最佳选择。TiAlN涂层可将基材芯片的寿命延长至260％。解决了涂层的Archard磨损模型，并将其应用于冷挤压的有限元模型中，以计算冷挤压模具的磨损深度和寿命。结果表明，与TiAlCrN和TiN涂层相比，TiAlN涂层是冷挤压模具的最佳选择。TiAlN涂层可将基材芯片的寿命延长至260％。