Orientation Effects on Fatigue Behavior of Additively Manufactured Stainless Steel
Orientation Effects on Fatigue Behavior of Additively Manufactured Stainless Steel
复制标题
取向对增材制造不锈钢疲劳行为的影响
DOI：
10.1115/pvp2017-65948
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发表时间：
2017
期刊：
影响因子：
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通讯作者：
J. Schoenung
中科院分区：
文献类型：
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作者：
Thale R. Smith;J. Sugar;C. S. Marchi;J. Schoenung
直接能量沉积（DED）是一种增材制造工艺，可以在单个制造步骤中生产复杂的近净形金属部件。DED增材制造有可能减少原材料浪费，简化制造链并提高设计灵活性。更广泛地接受DED技术的一个主要障碍是对DED产生的新型微结构中的缺陷群及其与工艺参数和所得机械性能的关系的理解有限。已经观察到，与改变构建方向一样简单的设计选择导致在其他相同沉积参数下沉积的304 L型奥氏体不锈钢的屈服强度的差异高达25%。为了更好地理解构建方向和由此产生的缺陷群对DED 304 L疲劳行为的作用，对从相对于构建方向的垂直和水平方向提取的周向缺口圆柱形试样进行了拉伸-拉伸疲劳测试。缺口疲劳行为被认为是强烈影响的制造缺陷人口的材料，为不同的建设方向。
Direct energy deposition (DED) is an additive manufacturing process that can produce complex near-net shape metallic components in a single manufacturing step. DED additive manufacturing has the potential to reduce feedstock material waste, streamline manufacturing chains, and enhance design flexibility. A major impediment to broader acceptance of DED technology is limited understanding of defect populations in the novel microstructures produced by DED and their relationship to process parameters and resultant mechanical properties. A design choice as simple as changing the build orientation has been observed to result in differences as great as ∼25% in yield strength for type 304L austenitic stainless steel deposited with otherwise identical deposition parameters. To better understand the role of build orientation and resultant defect populations on fatigue behavior in DED 304L, tension-tension fatigue testing has been performed on circumferentially notched cylindrical test specimens extracted from both vertical and horizontal orientations relative to the build direction. Notched fatigue behavior was found to be strongly influenced by the manufacturing defect populations of the material for different build orientations.