Study on the Influence of Interlayer Idle Time on the Temperature Field and Deposition Quality of GH3536 Alloy Fabricated by Laser Additive Manufacturing

doi:10.3901/JME.260076

Abstract

Abstract: Focusing on the problems of non-uniform temperature fields and thickness variations along the build direction in thin-walled laser directed energy deposition (LDED) samples, this research investigates the influence of interlayer idle time on the temperature field and quality of GH3536 samples fabricated via DED. The thermal field during the deposition process is monitored in real time using an off-axis infrared thermal imaging camera. Five temperature field features are extracted: length of melt pool, peak temperature of melt pool, average temperature of the central melt pool, heat affected layers, and average cooling rate of layers. Additionally, the surface morphology, microstructure, microhardness, and tensile strength of the samples are analyzed. The results indicate that extending the interlayer idle time can reduce the melt pool length and heat-affected zone, increase the average layer cooling rate, decrease thermal accumulation effect, improve dimensional accuracy, and reduce surface roughness. The side surface roughness Ra of the experimental samples decreased by 36.28%. Meanwhile, an increased interlayer idle time results in a finer and more uniform grain structure, which in turn enhances both the microhardness and tensile strength. The ultimate tensile strength of the experimental samples increased by 9.45%. The increases in melt pool length and heat-affected zone are negatively correlated with the appearance quality and mechanical properties, whereas an increase in the average layer cooling rate shows a positive correlation with both appearance quality and mechanical properties. This study provides a basis for the optimization of process parameters and performance control in the laser directed energy deposition of GH3536 alloy.

Key words: directed energy deposition, thermal field, mechanical property, interlayer idle time

CLC Number:

TG665

WANG Di, WEI Yang, ZHENG Pinzhu, TIAN Yinqian, YANG Yongqian, ZHOU Heng, LI Yanwen, ZHANG Shiqin, HAN Changjun. Study on the Influence of Interlayer Idle Time on the Temperature Field and Deposition Quality of GH3536 Alloy Fabricated by Laser Additive Manufacturing[J]. Journal of Mechanical Engineering, 2026, 62(3): 146-159.

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