Effects of process parameters on the crystallographic orientation and elemental segregation behavior of a novel Ni-based superalloy in laser additive manufacturing

IF 2.4 4区 材料科学 Q2 METALLURGY & METALLURGICAL ENGINEERING
Lei Yao, Lianqi Shang, Shaofeng Chen, Liang Cao, Jingjing Liang
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引用次数: 0

Abstract

The effect of process parameters of DED technology on elemental segregation and crystallographic orientation of alloys was investigated. The results show that the degree of elemental segregation decreases with the increase of scanning rate, and the degree of segregation rather increases with the increase of deposition height. The microstructure of all specimens consists mostly of columnar grains grown epitaxially along the build direction, showing a clear [001] orientation. The increase in scanning rate weakens the effect of epitaxial growth of crystals, leading to a significant weakening of the strength of the weave in the [001] direction texture. In addition, the actual growth direction of the dendrites is not strictly parallel to the building direction, but is tilted towards the laser scanning direction, resulting in a large deflection angle from the building direction. Based on the synergistic effect of the local temperature gradient and the optimal grain orientation, a composite temperature gradient model is established in combination with the numerical simulation of the temperature field, which reasonably explains this phenomenon. The fundamental reason for the deflection of the dendrite growth direction is that the direction of the composite temperature gradient deviates from the build direction, and the transverse temperature gradient is larger after the scanning rate is increased, resulting in a larger deflection angle.

工艺参数对激光增材制造中新型镍基超合金晶体取向和元素偏析行为的影响
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来源期刊
Welding in the World
Welding in the World METALLURGY & METALLURGICAL ENGINEERING-
CiteScore
4.20
自引率
14.30%
发文量
181
审稿时长
6-12 weeks
期刊介绍: The journal Welding in the World publishes authoritative papers on every aspect of materials joining, including welding, brazing, soldering, cutting, thermal spraying and allied joining and fabrication techniques.
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