The effects of Hf addition on defects and mechanical properties of the “hard-to-weld” superalloy IN738LC manufactured by Selective Laser Melting (SLM) process were studied. The addition of Hf inhibits cracking in SLMed IN738LC. Cracking free and low porosity IN738LC parts were obtained in a wide range of process parameters. The study shows that the cracks were refilled by Hf-riched melt and the relative density was increased, thus the tensile properties at 700 and 850 °C were improved.

中文翻译：

---

f对选择性激光熔炼IN738LC凝固裂纹的抑制作用

研究了添加f对通过选择性激光熔化（SLM）工艺制造的“难焊”超级合金IN738LC的缺陷和机械性能的影响。Hf的添加抑制了SLMed IN738LC中的开裂。可在多种工艺参数下获得无裂纹且低孔隙率的IN738LC零件。研究表明，裂纹被富氢的熔体重新填充，相对密度增加，从而改善了700和850°C时的拉伸性能。