Process optimisation of selective laser melting using energy density model for nickel based superalloys
Process optimisation of selective laser melting using energy density model for nickel based superalloys
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DOI：
10.1179/1743284715y.0000000108
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发表时间：
2016-01-01
影响因子：
1.8
通讯作者：
Attallah, M. M.
中科院分区：
文献类型：
--
作者：
Carter, L. N.;Wang, X.;Attallah, M. M.
选择性激光熔化（SLM）应用于镍基高温合金的主要挑战是工艺优化性能，以最大限度地提高机械性能。能量密度参数通常被用作半定量方法来确定能量阈值，超过该能量阈值，材料几乎实现完全固结。尽管如此，一些Ni超合金在SLM期间容易形成裂纹，这不能通过工艺优化来避免。在本报告中，提出了一个比较研究，显示的效用的能量密度参数的过程优化的γ '和γ'/γ ''强化镍基高温合金。对于这两种类别，发现构建密度随着能量密度的增加而增加[即空隙面积（%）减少]。然而，没有直接的相关性，可以发现之间的能量密度参数和开裂密度。
The main challenge associated with the application of selective laser melting (SLM) to Ni based superalloys is the performance of process optimisation to maximise the mechanical properties. The energy density parameter has typically been used as a semiquantitative approach to identify the energy threshold beyond which the material achieves virtually full consolidation. Nonetheless, some Ni superalloys are susceptible to crack formation during SLM, which cannot be avoided via process optimisation. In the present report, a comparative study is presented showing the utility of the energy density parameter in process optimisation for gamma' and gamma'/gamma '' strengthened Ni based superalloys. For both classes, it was found that the build density increases [i.e. void area (%) decreases] with the increase in the energy density. Nonetheless, no direct correlation can be found between the energy density parameter and the cracking density.