Abstract Maraging steel 300 (MS300) is a precipitation-strengthening iron–nickel alloy with outstanding properties such as good mechanical strength, weldability and corrosion resistance. However, the poor wear resistance has limited the application. In this work, high-performance WC reinforced MS300 composites were fabricated by high-pressure cold spray, which enables the additive manufacturing of bulk material well below its melting point. XRD analysis shows that no phase transformation occurred either to the WC reinforcements or the MS300 matrix. The distribution and morphology of the WC particles in the composite samples were characterized by X-ray computed tomography (XCT). The results show that a high retainability (85.4%) of WC particles was obtained at high working parameters (N2, 5 MPa, 900 °C), and the solution-aging treatment resulted in decreased WC volume fraction and smoothing of WC shape. Microstructure observation of WC evolution shows that a thick diffusion layer was formed around the WC particle after solution-aging treatment significantly improving the interfacial bonding. Due to the more severe plastic deformation and higher WC retainability, the as-fabricated samples with higher propelling gas pressure demonstrate a higher tensile strength and better wear resistance. It is found that a higher solution temperature (1000 °C) can lead to an enhanced cohesive bonding within the composite. Finally, the solution-aged composite shows an excellent wear resistance under the improved WC bonding and precipitation hardening.

中文翻译：

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冷喷涂 WC 增强马氏体时效钢 300 复合材料：微观结构表征和机械性能

摘要 马氏体时效钢300（MS300）是一种沉淀强化型铁镍合金，具有良好的机械强度、焊接性和耐腐蚀性能等优异性能。但耐磨性差限制了其应用。在这项工作中，通过高压冷喷涂制造了高性能 WC 增强的 MS300 复合材料，这使得散装材料的增材制造能够远低于其熔点。XRD 分析表明，WC 增强材料或 MS300 基体均未发生相变。通过X射线计算机断层扫描（XCT）表征复合样品中WC颗粒的分布和形态。结果表明，在高工作参数（N2、5 MPa、900 °C）下获得了高保留率（85.4%）的 WC 颗粒，固溶时效处理导致 WC 体积分数降低和 WC 形状平滑。WC演化的微观结构观察表明，经过固溶时效处理后，WC颗粒周围形成了厚的扩散层，显着改善了界面结合。由于更严重的塑性变形和更高的WC保持性，具有更高推进气体压力的制造样品表现出更高的拉伸强度和更好的耐磨性。发现较高的溶液温度 (1000 °C) 可以增强复合材料内的内聚力。最后，固溶时效复合材料在改进的 WC 结合和沉淀硬化下表现出优异的耐磨性。WC演化的微观结构观察表明，经过固溶时效处理后，WC颗粒周围形成了厚的扩散层，显着改善了界面结合。由于更严重的塑性变形和更高的WC保持性，具有更高推进气体压力的制造样品表现出更高的拉伸强度和更好的耐磨性。发现较高的溶液温度 (1000 °C) 可以增强复合材料内的内聚力。最后，固溶时效复合材料在改进的 WC 结合和沉淀硬化下表现出优异的耐磨性。WC演化的微观结构观察表明，经过固溶时效处理后，WC颗粒周围形成了厚的扩散层，显着改善了界面结合。由于更严重的塑性变形和更高的WC保持性，具有更高推进气体压力的制造样品表现出更高的拉伸强度和更好的耐磨性。发现较高的溶液温度 (1000 °C) 可以增强复合材料内的内聚力。最后，固溶时效复合材料在改进的 WC 结合和沉淀硬化下表现出优异的耐磨性。具有更高推进气体压力的制造样品表现出更高的拉伸强度和更好的耐磨性。结果表明，较高的固溶温度（1000 °C）可以增强复合材料内的内聚力。最后，固溶时效复合材料在改进的 WC 结合和沉淀硬化下表现出优异的耐磨性。具有更高推进气体压力的制造样品表现出更高的拉伸强度和更好的耐磨性。发现较高的溶液温度 (1000 °C) 可以增强复合材料内的内聚力。最后，固溶时效复合材料在改进的 WC 结合和沉淀硬化下表现出优异的耐磨性。