SLM成形Inconel 738合金缺陷的演变及形成机理

doi:10.11896/cldb.21040269

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Abstract The evolution experiments of single-track, multi-tracks and multi-layers experiments were carried out on Inconel 738 alloy fabricated by selective laser melting (SLM) under different parameters, in order to further investigate the formation mechanism of crack defects. The results show that the formation of porosity will induce the formation of cracks when the laser energy density E is too high or too low. Both solidification cracks and liquation cracks occur in Inconel 738 alloy formed by SLM, and liquation cracks are dominated. At the end of solidification, the crystals rapidly grow to form a dendrite framework. At this time, the deformation of the dendrite framework can well develop, but the residual liquid phase between the crystals is hard to flow, and the tiny gap generating under the action of thermal tensile stress will not be filled in time, leading to solidification cracks. The formation of liquation crack is mainly due to the segregation of B element at grain boundaries, which leads to the formation of γ + γ′ phase with low melting point at grain boundaries. Under cyclic heat, liquid film is formed leading to the reduction of tensile strength at grain boundaries, which is pulled apart by thermal tensile stress to form liquation cracks.

Key words： Inconel 738 alloy selective laser melting (SLM) laser line energy density defect

Published: 10 July 2022 Online: 2022-07-12

CLC number:

TG146.1+5

Fund:Program for Major Projects of Science and Technology in Gansu Province (17ZD2GC011), the Opening Project of State Key Laboratory of Nickel and Cobalt Resources Comprehensive Utilization and the Hongliu First-class Discipline Construction Plan of Lanzhou University of Technology.

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	Articles by authors
	MA Yutian
	XU Jiayu
	GAO Yubi
	LIU Bo
	HU Yong
	DING Yutian
	CHEN Dalin
	CHEN Hanfeng

Cite this article:

MA Yutian,XU Jiayu,GAO Yubi, et al. Evolution and Formation Mechanism of Defect in SLM-Built Inconel 738 Alloy[J]. Materials Reports, 2022, 36(13): 21040269-7.

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http://www.mater-rep.com/EN/10.11896/cldb.21040269 OR http://www.mater-rep.com/EN/Y2022/V36/I13/21040269

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