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首页> 外文会议>International Congress on Applications of Lasers Electro-Optics >SELECTIVE LASER MELTING OF INCONEL 625 ALLOY WITH REDUCED DEFECT FORMATION: Paper # LAM 503
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SELECTIVE LASER MELTING OF INCONEL 625 ALLOY WITH REDUCED DEFECT FORMATION: Paper # LAM 503

机译：具有减少缺陷形成的Inconel 625合金的选择性激光熔化：纸＃am 503

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摘要

Selective Laser Melting (SLM) of nickel-based superalloys, such as Inconel 625 (IN625), enables new opportunities for the additive manufacture of highly-optimised engineered structures with high service temperature, and exceptional resistance to oxidation and corrosion. However, SLM processing of IN625 can be challenging due to the occurrence of material defects such as porosity and micro-cracking. An experimental and analytical investigation has identified potential strategies for reduced defect formation, through careful selection of processing conditions and modification of material composition, respectively. Reducing the inertial effects of the laser galvanometer with a laser skywriting function has been found to significantly reduce the formation of porosity defects. However, micro-crack formation was not mitigated with variation of laser processing parameters. Thermodynamic simulations were used to predict the solidification behaviour for several modified IN625 compositions where silicon and manganese contents were varied within the standard material composition range. An index to predict the relative hot tearing sensitivity of each composition was calculated from the solidification data, which revealed that hot tearing susceptibility may be reduced by minimizing silicon and manganese. Application of the identified process and composition improvements can lead to SLM manufacture of defect-free IN625 components for high-value applications.
机译：镍基超合金的选择性激光熔融（SLM），如625（IN625），为高度优化的工程结构提供新的高度优化工程结构的新机会，以及对氧化和腐蚀的卓越抗性。然而，由于诸如孔隙率和微裂纹的材料缺陷的发生，IN625的SLM处理可能是具有挑战性的。实验和分析调查通过仔细选择的加工条件和材料组成的改性，确定了减少缺陷形成的潜在策略。已经发现减少激光电流计的惯性效应具有激光的天空功能，显着降低了孔隙缺陷的形成。然而，随着激光加工参数的变化，不会减轻微裂纹形成。热力学模拟用于预测几种改性IN625组合物的凝固行为，其中硅和锰含量在标准材料组合物范围内变化。从凝固数据计算预测每个组合物的相对热撕裂敏感性的指数，凝固数据揭示了通过最小化硅和锰可以减少热撕裂敏感性。鉴定的方法和组成改善的应用可以导致SLM制造无缺陷的IN625组件，用于高价值应用。

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