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Process phenomena influencing the tensile and anisotropic characteristics of additively manufactured maraging steel

机译：影响增材制造马氏体时效钢的拉伸和各向异性特性的工艺现象

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摘要

The tensile mechanical properties and anisotropy levels of identical test-coupons, fabricated from maraging steel 300 (MS300) using two alternative EOS EOSINT M280 Additive Manufacturing (AM) systems, have been examined. The mechanical performance variations resulting from process differences between the two suppliers and the part's build volume orientation (0 degrees, 45 degrees, and 90 degrees) are investigated. Significant microstructural discrepancies, affecting mechanical performance, plasticity and anisotropy levels, have been observed in the as-built samples obtained from the two suppliers. A difference in the angle of the laser scan strategy, in conjunction with unfavourable powder feedstock characteristics, are understood to have had a profound influence on the plasticity and anisotropy divergences observed in the AM MS300 alloy. Plastic anisotropy levels can be largely reduced through application of aging heat-treatments, however, a degree of transverse strain anisotropy is likely to remain due to the AM alloy's fabrication history. Moreover, in this work both the anisotropic and elasticity tensors for this material are derived. These tensors can be used by researchers working on modelling and simulation of the MS300 mechanical properties.
机译：检验了使用两种替代EOS EOSINT M280增材制造（AM）系统由马氏体时效钢300（MS300）制造的相同测试券的拉伸力学性能和各向异性水平。研究了由两个供应商之间的工艺差异以及零件的​​构造体积方向（0度，45度和90度）导致的机械性能变化。在从两家供应商获得的竣工样品中，观察到了显着的微观结构差异，从而影响了机械性能，塑性和各向异性水平。激光扫描策略角度的变化以及不利的粉末原料特性，被认为对在AM MS300合金中观察到的可塑性和各向异性发散产生了深远的影响。通过应用时效热处理可以大大降低塑性各向异性水平，但是，由于AM合金的制造历史，横向应变各向异性程度可能会保持不变。此外，在这项工作中，导出了该材料的各向异性和弹性张量。研究人员可以使用这些张量来对MS300机械特性进行建模和仿真。

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