Tips on working with Nickel and Nickel alloys in metal additive manufacturing

其他高温超级合金组成也基于NI组合金，称为Inconel，两个最常见的变体为625和718。使用合金的选择将取决于最大工作温度和零件强度要求。但是，在AM领域，由于后建造热处理周期相对直截了当，因此对625合金有一定的偏好。

These Ni based alloys have a high alloy content, which enables them to withstand a variety of severe corrosive environments. However, even in more severe corrosive environments the combination of nickel and chromium resists oxidizing chemicals, and the molybdenum content resists non-oxidizing environments. The presence of molybdenum also makes these alloys very resistant to pitting and crevice corrosion. Furthermore, the niobium acts to stabilize the alloy against sensitization during welding, preventing subsequent intergranular stress corrosion cracking.

As rough rules of thumb it’s possible to select which alloy to use according to the following criteria.

- 在高温下，即使在980°C至1140°C的范围内，也选择了625合金的高强度和对蠕变，破裂和腐蚀的耐药性。625的室温拉伸强度在827-1034MPA之间。

- 如果需要较高的氧化能力或强度，那么718可以在稍低的最大工作温度下使用，通常在700℃至760°C的范围内，即使已知大约718 AM的零件也有在超过1000°C的温度下使用。获得更高的强度，因为这种合金可以变硬，这通常是在初始溶液处理后进行快速冷却后在两阶段的过程中实现的。718合金在完全老化的情况下具有标称的室温拉伸强度在1170-1275MPA之间。

The values given above for tensile strength are only indicative of the performance of these alloys. It has been reported within the AM sector that higher values have been achieved, and for this reason it is always advisable to have your own verified test results following whichever heat treatment cycle has been selected, or specified. Note, both alloys can also be used down to the extremely low cryogenic temperatures.

从这两种基于NI的超级合金的成功之后，对其他提供更高性能的高温合金也引起了极大的兴趣。如今，其他Inconel组合金以及Hastelloy X，C276和MAR-M247等其他Inconel组合金也存在专有激光粉末床融合过程参数。

此信息摘自雷尼沙纸，用于添加剂制造的金属合金的现状。