Studies on the Effect of Substrate Preheating, Interlayer Dwell, and Heat Treatment on Microstructure, Residual Stress, and Mechanical Properties of IN625 Superalloy built by Direct Metal Deposition

IF 1.5 4区 材料科学 Q3 ENGINEERING, MECHANICAL
Mohsin Khan K, T. B. Rao, R. Mohammed, Manjunath B N, K. Abhinav, Vinod A R
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引用次数: 1

Abstract

In this investigation, IN625 alloy samples were processed by directed energy deposition (DED) under various metal deposition strategies such as substrate preheating, inter-layer dwell, and with combined substrate preheating, inter-layer dwell as well as post-heat treatment. The processed sample's microstructural characteristics, residual stress, microhardness, and tensile properties are assessed in comparison to the manufacturing strategies. Rapid heat dissipation caused finer microstructure near the substrate. There is a growth of columnar grain structure epitaxially in the build direction. The progressive microstructure change seen in the build direction across the cross-section was due to the gradual rise of heat accumulation between subsequent layers. The inter-dendritic zones contained Laves phases. Laves phases have a high Nb, Mo as well as Si content, according to the EDS spectrum. The FESEM microstructural morphology of the deposited samples after their post-heat treatment has shown a new microstructure with the combination of equiaxed (recrystallized) and columnar dendritic structure with the reconstruction of columnar dendritic solidification microstructure into equiaxed grains. Heat treatment caused the Laves phases to dissolve in the matrix of IN625 alloy, which led to the precipitation of nanometric γ″ phases. The deposition strategies with substrate preheating significantly decreased the residual stress with moderately improved mechanical properties. The combination of substrate preheating, inter-layer dwell, and post-heat treatment has shown an outstanding reduction of residual stress along with a remarkable improvement in tensile strength with the retainment of an equivalent ductility compared with the other strategies.
基体预热、层间停留和热处理对金属直接沉积IN625高温合金组织、残余应力和力学性能影响的研究
在本研究中,IN625合金样品在各种金属沉积策略下通过定向能量沉积(DED)进行处理,如基底预热、层间停留、以及组合基底预热、层层间停留和后热处理。与制造策略相比,对加工样品的微观结构特征、残余应力、显微硬度和拉伸性能进行了评估。快速散热导致衬底附近的微观结构更加精细。在构建方向上外延生长柱状晶粒结构。在整个横截面的构建方向上看到的渐进微观结构变化是由于后续层之间的热量积累逐渐增加。枝晶间带含有Laves相。根据EDS光谱,Laves相具有高Nb、Mo以及Si含量。沉积样品经过后热处理后的FESEM微观结构形态显示出一种新的微观结构,其具有等轴(再结晶)和柱状树枝状结构的组合,并将柱状树枝晶凝固微观结构重建为等轴晶粒。热处理使Laves相溶解在IN625合金基体中,导致纳米γ〃相的析出。衬底预热的沉积策略显著降低了残余应力,并适度改善了机械性能。与其他策略相比,基材预热、层间停留和后热处理的组合显示出残余应力的显著降低,以及拉伸强度的显著提高,同时保持了等效的延展性。
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来源期刊
CiteScore
3.00
自引率
0.00%
发文量
30
审稿时长
4.5 months
期刊介绍: Multiscale characterization, modeling, and experiments; High-temperature creep, fatigue, and fracture; Elastic-plastic behavior; Environmental effects on material response, constitutive relations, materials processing, and microstructure mechanical property relationships
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