Effect of layer thickness, and laser energy density on the recrystallization behavior of additively manufactured Hastelloy X by laser powder bed fusion

IF 4.2 Q2 ENGINEERING, MANUFACTURING

Additive manufacturing letters Pub Date : 2023-10-19 DOI:10.1016/j.addlet.2023.100182

Faraz Deirmina , Olutayo Adegoke , Matteo Del Col , Massimo Pellizzari

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Abstract

A single-phase Ni-superalloy (Hastelloy X) was fabricated by laser powder bed fusion (L-PBF) using different layer-thicknesses (i.e., 40, 60, 80, and 120 µm), by implementing different optimized volumetric laser energy densities (i.e., VED of 67, 44, 31, and 35 J/mm³). As-built (AB) microstructure, grain morphology, and the recrystallization kinetics were systematically dependent on VED which generally decreases by increasing layer thickness. An increased VED led to a columnar grain morphology, strong texture, large lattice micro-strain, high fraction of low angle boundaries, and increased yield strength. Electron back scattered diffraction (EBSD) analysis revealed that also the recrystallization kinetics was significantly dependent on VED. By decreasing the VED, recrystallization was largely suppressed because of the lower dislocation density in the AB state. A processing map to study the recrystallization as a function of VED, and solution annealing temperature is proposed.

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层厚和激光能量密度对激光粉末床熔合增材制造哈氏合金X再结晶行为的影响

采用不同的层厚度（即40、60、80和120µm），通过实施不同的优化体积激光能量密度（即67、44、31和35J/mm3的VED），通过激光粉末床熔融（L-PBF）制备了单相镍超合金（Hastelloy X）。竣工（AB）微观结构、晶粒形态和再结晶动力学系统地依赖于VED，VED通常随着层厚度的增加而降低。VED的增加导致柱状晶粒形态、强织构、大的晶格微应变、高比例的低角度边界和增加的屈服强度。电子背散射衍射（EBSD）分析表明，再结晶动力学也显著依赖于VED。通过降低VED，由于AB态的位错密度较低，再结晶在很大程度上受到抑制。提出了一个研究再结晶与VED和固溶退火温度关系的工艺图。

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