Effect of heat treatment on the microstructure and fatigue strength of CoCrMo alloys fabricated by selective laser melting
Effect of heat treatment on the microstructure and fatigue strength of CoCrMo alloys fabricated by selective laser melting
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DOI：
10.1016/j.matlet.2019.02.085
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发表时间：
2019-06
影响因子：
3
通讯作者：
Erina Seki;Yuka Kajima;Atsushi Takaichi;Nuttaphon Kittikundecha;H. Cho;Hein Linn Htat;H. Doi;T. Hanawa;N. Wakabayashi
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文献类型：
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作者：
Erina Seki;Yuka Kajima;Atsushi Takaichi;Nuttaphon Kittikundecha;H. Cho;Hein Linn Htat;H. Doi;T. Hanawa;N. Wakabayashi
研究了热处理对选区激光熔化制备的Co、Cr、Mo合金显微组织和疲劳强度的影响。在相对于构建方向的垂直和水平方向上制备试样，并在1150 °C下进行1小时的热处理。显微组织和疲劳强度的评估表明，热处理试样的疲劳强度显着高于作为建成试样，这是由于发生再结晶和熔池边界在热处理过程中的消失。然而，尽管在热处理样品的微观结构均匀化，它们表现出机械各向异性（类似于建成样品），这是由于样品取向的层数和处理时间的影响。
We investigate the effect of heat treatment on the microstructure and fatigue strength of Cosingle bondCrsingle bondMo alloys fabricated by selective laser melting. Specimens are prepared in vertical and horizontal orientations with respect to the build direction and are subjected to heat treatment at 1150 °C for 1 h. Evaluation of the microstructure and fatigue strength reveals that the heat-treated specimens have significantly higher fatigue strength than the as-built specimens, which is attributed to the occurrence of recrystallization and the disappearance of molten pool boundaries during heat treatment. However, despite microstructure homogenization in the heat-treated samples, they exhibit mechanical anisotropy (similar to the as-built samples), which is attributed to the influence of the sample orientation on the number of layers and the processing time.