Adina Cristina Toma, M. Condruz, A. Paraschiv, Teodor-Adrian Badea, D. Pătroi, Nicoleta Mirela Popa
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引用次数: 0
摘要
研究了添加剂制造的含 0.14 wt.% C 的 CoCrMo 合金在 914 °C 下的循环氧化行为,共进行了 32 个循环,每个循环持续 10 小时,总暴露时间为 320 小时。实验结果表明,这种 CoCrMo 合金在 914 ℃ 下的氧化过程遵循抛物线规律,开始时氧化过程较快,40 h 后氧化过程减慢。微观结构分析表明,在印刷状态下,形成的相主要是 γ 基体和少量的 ε 相。氧化过程确保了 ε 相的增加和碳化物的析出,在 914 °C 下暴露 40 小时后,材料硬度增加了 12%。氧化过程导致氧化鳞片的形成,其中包括致密的 Cr2O3 层和多孔的 CoCr2O4 尖晶石层,后者在暴露 240 小时后剥落。尽管发生了剥落,但氧化物鳞片在 O、Cr 和 Co 的存在下继续发展。实验分析为该材料在空气中长期高温暴露下的行为提供了有价值的见解,证明了它适合作为用于弯曲金属管接头弯头的添加剂制造心轴的候选材料。
Investigation of High-Temperature Oxidation Behavior of Additive Manufactured CoCrMo Alloy for Mandrel Manufacturing
The cyclic oxidation behavior of an additive manufactured CoCrMo alloy with 0.14 wt.% C was investigated at 914 °C for 32 cycles, each lasting 10 h, resulting in a total exposure time of 320 h. The oxidation rate was assessed for mass gain after finishing each 40 h oxidation cycle. It was experimentally determined that the oxidative process at 914 °C of this CoCrMo alloy follows a parabolic law, with the process being fast at the beginning and slowing down after the first 40 h. The microstructural analysis revealed that in the as-printed state, the phases developed were primarily the γ matrix and minor traces of ε phase. The oxidative process ensured an increase in the ε phase and precipitation of carbides which produced a 12% increase in the material’s hardness after the first 40 h of exposure at 914 °C. The oxidation process led to the development of an oxide scale comprising a dense Cr2O3 layer and a porous layer of CoCr2O4 spinel, the latter spalling after the 240 h of exposure. Despite this spallation, the oxide scale continued to develop in the presence of O, Cr, and Co. The experimental analysis provided valuable insights regarding the material’s behavior under prolonged exposure at high temperature in air, demonstrating its suitability as a candidate for additive manufactured mandrels used for bending metallic pipe fitting elbows.