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首页> 外文期刊>Journal of Materials Engineering and Performance >Sensitivity of Liquation Cracking to Deposition Parameters and Residual Stresses in Laser Deposited IN718 Alloy
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Sensitivity of Liquation Cracking to Deposition Parameters and Residual Stresses in Laser Deposited IN718 Alloy

机译：激光沉积沉积参数与沉积参数和残余应力的敏感性沉积IN718合金

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摘要

The laser deposited IN718 alloys were fabricated with laser cladding system under different conditions to estimate the sensitivity of weld metal liquation cracking. The microstructure and the crack characterization of the laser deposited IN718 alloy were investigated, and the effect of metallurgical factors and residual stress on the crack sensitivity was analyzed. The results showed that the continuous dendritic Laves was precipitated and formed a Lave-austenite interface with ambiguous nanohardness distribution. The weld metal liquation cracking was propagated along the laser scanning direction and the buildup direction in the laser deposited IN718 alloy simultaneously, and the Nb-/Mo-riched fine granular clusters were formed in the crack surface. The precipitation amount of the coarse eutectic phases, presented as dendrite or network, was increased in the laser deposited alloy fabricated with IN718/C-Fe-Cr composite powder and slow cooling rate. The total crack length and the maximum crack length were decreased by increasing cooling rate, and the transverse residual stress was increased with increasing buildup layer number. The crack sensitivity of the laser deposited IN718 alloy was increased by the crack initiation provided by the metallurgical defects and the eutectic phases with low melting temperatures, and then, crack propagated along the continuous phase under the transverse residual stress.
机译：激光沉积在718个合金中，在不同条件下用激光熔覆系统制造，以估计焊接金属裂解裂解的灵敏度。研究了激光沉积IN718合金的微观结构和裂纹表征，分析了冶金因子对裂纹敏感性的影响。结果表明，连续的树突式熔融液沉淀并形成了具有模糊纳米液体分布的探险奥氏体界面。焊接金属液化裂解沿着激光扫描方向传播，同时沉积在718合金中的激光器中的累积方向，并在裂纹表面中形成Nb-/ Mo富含细粒细粒簇。用IN718 / C-FE-CR复合粉末制造的激光沉积合金和缓慢冷却速率的激光沉积合金中增加了粗晶相的沉淀量。通过增加冷却速率降低总裂缝长度和最大裂缝长度，随着增加的累积层数而增加横向残余应力。通过冶金缺陷和具有低熔化温度的裂纹引发，增加了激光沉积In718合金的裂纹敏感性，然后在横向残余应力下沿连续相裂隙沿连续相突出。

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