热输入对脉冲等离子弧增材制造Inconel 718合金组织与性能的影响<sup>*</sup>

doi:10.11896/j.issn.1005-023X.2017.014.021

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Abstract The effect of heat input on microstructure and mechanical property of pulsed plasma arc additive manufactured Inconel 718 superalloy samples were investigated. Five different heat inputs ranging from 1.08×10⁶ J/m to 1.76×10⁶ J/m were adop-ted by changing power and welding speed. The microstructure morphology, dendritic spacing, elemental segregation and interdendritic Laves phase were also studied by using optical microscopy (OM), scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS). The results show that as the heat inputs increase, the microstructure morphology is changed from columnar dendrites to cellular dendrites, and dendritic spacing also increases from 6.34 μm to 9.09 μm. Consequently, elemental segregation of Nb and Mo are promoted so that the morphology of interdendritic Laves phase is changed from particles to chains, which leads to the decrease of microhardness.

Key words： heat input additive manufacturing pulsed plasma arc microstructure

Published: 04 May 2018

CLC number:

TG456.2

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	Articles by authors
	WANG Kaibo
	LU Yaohui
	LIU Yuxin
	SUN Zhe
	XU Binshi

Cite this article:

WANG Kaibo,LU Yaohui,LIU Yuxin, et al. Influence of Heat Input on Microstructure and Mechanical Property of Pulsed Plasma Arc Additive Manufactured Inconel 718 Superalloy[J]. Materials Reports, 2017, 31(14): 100-104.

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http://www.mater-rep.com/EN/10.11896/j.issn.1005-023X.2017.014.021 OR http://www.mater-rep.com/EN/Y2017/V31/I14/100

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