Effect of Compositional Variation Induced by EBM Processing on Deformation Behavior and Phase Stability of Austenitic Cr-Mn-Ni TRIP Steel
Effect of Compositional Variation Induced by EBM Processing on Deformation Behavior and Phase Stability of Austenitic Cr-Mn-Ni TRIP Steel
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DOI：
10.1007/s11837-020-04018-6
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发表时间：
2020-01-24
期刊：
影响因子：
2.6
通讯作者：
Niendorf, T.
中科院分区：
文献类型：
--
作者：
Guenther, J.;Lehnert, R.;Niendorf, T.
电子束熔化（EBM）是用于制造复杂形状金属部件的已建立的基于粉末床的增材制造工艺。对于亚稳奥氏体Cr-Mn-Ni TRIP钢，已报道形成均匀的细晶组织和优异的损伤容限。然而，取决于工艺参数，一定比例的Mn蒸发。这可能对变形机制以及动力学产生重大影响，如先前针对铸态材料所示。化学分级和机械定制部件的生产可以在设计自由度方面取得进一步进展。目前的研究提出的结果表征的变形和应变硬化行为的化学定制的Cr-Mn-Ni TRIP钢EBM处理。采用不同的扫描策略制造样本，从而产生不同的锰含量，随后进行拉伸测试。微观结构的演变已被彻底检查。从一个初始粉末开始，可以应用适当的扫描策略来有目的地蒸发Mn，并因此调节应变硬化以及马氏体形成动力学和极限拉伸强度。
Electron beam melting (EBM) is an established powder bed-based additive manufacturing process for the fabrication of complex-shaped metallic components. For metastable austenitic Cr-Mn-Ni TRIP steel, the formation of a homogeneous fine-grained microstructure and outstanding damage tolerance have been reported. However, depending on the process parameters, a certain fraction of Mn evaporates. This can have a significant impact on deformation mechanisms as well as kinetics, as was previously shown for as-cast material. Production of chemically graded and, thus, mechanically tailored parts can allow for further advances in terms of freedom of design. The current study presents results on the characterization of the deformation and strain-hardening behavior of chemically tailored Cr-Mn-Ni TRIP steel processed by EBM. Specimens were manufactured with distinct scan strategies, resulting in varying Mn contents, and subsequently tensile tested. Microstructure evolution has been thoroughly examined. Starting from one initial powder, an appropriate scan strategy can be applied to purposefully evaporate Mn and, therefore, adjust strain hardening as well as martensite formation kinetics and ultimate tensile strength.