[T6] AM Beam Based Technologies

[15B-T6-16] Mechanical Properties and Residual Stress Analysis of ODS Ni Superalloy Fabricated by Laser Powder Bed Fusion(L-PBF) Process

*D. W. Lee¹, S. G. Lee¹, C. V. Dinh¹, C. R. Kim¹, J. C. Kim¹, H. J. Kim², J. W. Kim³, J. G. Lim³, T. S. Yoon³ (1.University of Ulsan, Korea, 2.Korea Institute of Industrial Technology, Korea, 3.DaiShinKangup Co.,Ltd., Korea)

キーワード：Laser-powder bed fuison, ODS Ni-superalloy, additive manufacturing, Microstructure, Residual stress

The ODS superalloys are generally manufactured by Hot extrusion(HE) and Hot Isostatic Pressing (HIP) after mechanical alloy(MA). These alloys have high strength, so it is so difficult to make complicate shaped products. Therefore researches on additive manufacturing(AM) technology is being conducted as an alternative method. In this study, the experiment was conducted with a laser powder bed fusion(L-PBF) process using ODS Ni superalloy powders. The ODS Ni-superalloy powder similar to the composition of MA6000 was manufactured using a gas atomization process. All specimens of the produced ODS Ni-superalloy powder was prepared by an L-PBF process. We measured changes in densification behavior of specimens according to L-PBF process parameters and conducted residual stress measurements in order to verifying the cracking issues arising during the processing steps. We analyzed the microstructures and sintering behaviors and mechanical properties of the as-prepared powders and PBFed specimens using optical microscopy, scanning electron microscopy, XRD, LPS analysis and micro vickers hardness tests.