Aviezer Yaron, Ariely Shmuel, Bamberger Menachem, Zolotaryov Denis, Essel Shai, Lahav Ori
Faculty of Civil and Environmental Engineering, Technion-Israel Institute of Technology, Haifa 32000, Israel.
Israel Institute of Materials Manufacturing Technologies, Technion-Israel Institute of Technology, Haifa 32000, Israel.
Materials (Basel). 2024 Jun 3;17(11):2716. doi: 10.3390/ma17112716.
A new hydrothermal hot isostatic pressing (HHIP) approach, involving hydrothermal water conditions and no usage of inert gas, was hypothesized and tested on 3D-printed Al-10%Si-0.3%Mg (%Wt) parts. The aluminum-based metal was practically inert at the applied HHIPing conditions of 300-350 MPa and 250-350 °C, which enabled the employment of a long (6-24 h) HHIP treatment with hardly any loss of material (the overall loss due to corrosion was mostly <0.5% /). Applying the new approach on the above-mentioned samples resulted in an 85.7% reduction in the AM micro-pores, along with a 90.8% reduction in the pores' surface area at a temperature of 350 °C, which is much lower than the 500-520 °C applied in common argon-based aluminum HIPing treatments, while practically maintaining the as-recieved microstructure. These results show that better mechanical properties can be expected when using the suggested treatment without affecting the material fatigue resistance due to grain growth. The proof of concept presented in this work can pave the way to applying the new HHIPing approach to other AM metal parts.
一种新的水热热等静压（HHIP）方法被提出并在3D打印的Al-10%Si-0.3%Mg（重量百分比）零件上进行了测试，该方法涉及水热条件且不使用惰性气体。在300-350MPa和250-350°C的HHIP处理条件下，铝基金属实际上是惰性的，这使得能够进行长时间（6-24小时）的HHIP处理，材料损失几乎可以忽略不计（由于腐蚀造成的总损失大多<0.5%）。在上述样品上应用这种新方法，在350°C的温度下，增材制造（AM）微孔减少了85.7%，孔隙表面积减少了90.8%，这远低于普通氩基铝热等静压处理中使用的500-520°C，同时实际保持了初始微观结构。这些结果表明，使用建议的处理方法有望获得更好的机械性能，且不会因晶粒生长而影响材料的抗疲劳性。这项工作中提出的概念验证可为将新的HHIP处理方法应用于其他增材制造金属零件铺平道路。
