Microstructures and Fatigue Behavior of Additively Manufactured Maraging Steel Deposited on Conventionally Manufactured Base Plate
Microstructures and Fatigue Behavior of Additively Manufactured Maraging Steel Deposited on Conventionally Manufactured Base Plate
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DOI：
10.1007/s11665-021-05548-z
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发表时间：
2021-02
影响因子：
2.3
通讯作者：
Y. Uematsu;T. Kakiuchi;M. Nakajima;K. Matsuo
中科院分区：
文献类型：
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作者：
Y. Uematsu;T. Kakiuchi;M. Nakajima;K. Matsuo
通过粉末床熔融型选择性激光熔化将马氏体时效钢粉末添加沉积在常规制造的（CMed）马氏体时效钢基板上。由于熔融粉末在基板上的再固化，将残余拉伸应力引入到增材制造（AMed）部件中。拉伸疲劳试验使用具有AMed和CMed部件的混合结构的试样进行。混合结构试样的疲劳强度低于CMed试样的疲劳强度，因为疲劳裂纹主要在AMed部件中的缺陷处萌生。两种后时效处理均能提高AMed和CMed工件的硬度，但对疲劳强度影响不大。基于极值统计估计样本的AM处理部分中的缺陷的最大尺寸。通过线弹性断裂力学方法估计了竣工和老化后样品的疲劳极限。然而，预测值略高于实验值。
Maraging steel powder was additively deposited on the conventionally manufactured (CMed) maraging steel base plate by powder bed fusion type selective laser melting. Residual tensile stress was introduced into the additively manufactured (AMed) part due to the re-solidification of melted powder on the base plate. Tensile fatigue tests were conducted using the specimens having hybrid structure of AMed and CMed parts. The fatigue strengths of the specimens with hybrid structure were lower than those of the CMed specimens because fatigue cracks predominantly initiated at the defects in the AMed part. Two kinds of post-aging treatments could increase the hardness of the AMed and CMed parts, while had little effect on the fatigue strengths. The maximum size of the defects in the AMed part of the specimen was estimated based on the statistics of extremes. The fatigue limits of the as-built and post-aged samples were estimated by the linear elastic fracture mechanics approach. However, the predicted values were slightly higher than the experimental values.