The effect of Hf on solidification cracking inhibition of IN738LC processed by Selective Laser Melting

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 ran...

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Bibliographic Details
Published in:Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 2021-02, Vol.804, p.140733, Article 140733
Main Authors: Yu, Zhengrong, Guo, Chuan, Han, Shuang, Hu, Xiaogang, Cao, Lijie, Xu, Zhen, Ding, Hui, Zhu, Qiang
Format: Article
Language:English
Subjects:
Alloy design
Cracking inhibition
Laser beam melting
Laser beam welding
Laser powder bed fusion
Mechanical properties
Ni-based sueralloy
Process parameters
Rapid prototyping
Solidification
Superalloys
Tensile properties
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Summary: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.
ISSN:0921-5093
1873-4936
DOI:10.1016/j.msea.2021.140733