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Repeatability of the fatigue performance of additively manufactured A357.0 under different thermal treatment conditions

机译：在不同的热处理条件下，在不同的热处理条件下造成疲劳性能的疲劳性能的可重复性

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摘要

A357.0 parts were produced by laser-based powder bed fusion. An in-situ annealing strategy was applied by preheating the build platform, in order to relieve residual stresses and reduce anisotropic effects upon processing. The mean value and standard deviation for the fatigue strength at the given life time of 1 × 10~7 cycles were determined according to the staircase method, before and after T6 heat treatment. Samples parallel to the build platform and parallel to the growth direction were analysed separately and compared. The fatigue behaviour was substantially insensitive to post-processing heat treatment, since fracture initiation was governed by sub-surface lack-of-fusion defects that remained unchanged in the T6 conditions. The heat treatment caused an increase in porosity, yet without significant detriment to the fatigue resistance. The build orientation was not found to affect the average value of the fatigue strength, but it caused variations of the repeatability.
机译：A357.0零件是通过基于激光的粉末床融合产生的。通过预热构建平台来应用原位退火策略，以缓解残留的应力并减少加工时的各向异性效应。根据阶段方法，在T6热处理之前和之后确定给定寿命时间为1×10〜7循环的疲劳强度的平均值和标准偏差。单独分析并平行于构建平台并平行于生长方向的样品进行分析。疲劳行为基本上对后处理后热处理不敏感，因为断裂引发受到在T6条件下保持不变的融合缺陷的缺陷缺陷。热处理引起孔隙率的增加，但对疲劳性抗性显着损害。未发现构建方向影响疲劳强度的平均值，但它导致重复性的变化。

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