Development of process-structure linkage for Inconel 718 processed by laser powder bed fusion: a numerical modeling approach

IF 3.4 4区 工程技术 Q1 ENGINEERING, MECHANICAL
Anuj Kumar, Mukul Shukla
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引用次数: 0

Abstract

Purpose Understanding and tailoring the solidification characteristics and microstructure evolution in as-built parts fabricated by laser powder bed fusion (LPBF) is crucial as they influence the final properties. Experimental approaches to address this issue are time and capital-intensive. This study aims to develop an efficient numerical modeling approach to develop the process–structure (P-S) linkage for LPBF-processed Inconel 718. Design/methodology/approach In this study, a numerical approach based on the finite element method and cellular automata was used to model the multilayer, multitrack LPBF build for predicting the solidification characteristics (thermal gradient G and solidification rate R) and the average grain size. Validations from published experimental studies were also carried out to ensure the reliability of the proposed numerical approach. Furthermore, microstructure simulations were used to develop P-S linkage by evaluating the effects of key LPBF process parameters on G × R, G/R and average grain size. A solidification or G-R map was also developed to comprehend the P-S linkage. Findings It was concluded from the developed G-R map that low laser power and high scan speed will result in a finer microstructure due to an increase in G × R, but due to a decrease in G/R, columnar characteristics are also reduced. Moreover, increasing the layer thickness and decreasing the hatch spacing lowers the G × R, raises the G/R and generates a coarse columnar microstructure. Originality/value The proposed numerical modeling approach was used to parametrically investigate the effect of LPBF parameters on the resulting microstructure. A G-R map was also developed that enables the tailoring of the as-built LPBF microstructure through solidification characteristics by tuning the process parameters.
激光粉末床熔合Inconel 718工艺结构联动的数值模拟方法研究
目的了解和调整激光粉末床熔合成形零件的凝固特性和微观组织演变是至关重要的,因为它们会影响最终性能。解决这一问题的实验性方法需要耗费大量时间和资金。本研究旨在开发一种有效的数值模拟方法来开发lpbf加工的Inconel 718的工艺结构(P-S)联系。设计/方法/方法在本研究中,采用基于有限元法和元胞自动机的数值方法对多层、多径LPBF构建进行建模,以预测凝固特性(热梯度G和凝固速率R)和平均晶粒尺寸。已发表的实验研究也进行了验证,以确保所提出的数值方法的可靠性。此外,通过微观组织模拟,评估LPBF关键工艺参数对G × R、G/R和平均晶粒尺寸的影响,建立了P-S连锁。还开发了凝固或G-R图来理解P-S联系。结果表明,低激光功率和高扫描速度会使材料的G × R增大,从而获得更细的微观结构,但G/R的减小也会降低材料的柱状特征。增大焊层厚度和减小焊口间距降低了gxr,提高了G/R,形成了粗糙的柱状组织。采用所提出的数值模拟方法,参数化研究了LPBF参数对所得微观结构的影响。还开发了G-R图,通过调整工艺参数,通过凝固特性来定制已建成的LPBF微观结构。
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来源期刊
Rapid Prototyping Journal
Rapid Prototyping Journal 工程技术-材料科学:综合
CiteScore
8.30
自引率
10.30%
发文量
137
审稿时长
4.6 months
期刊介绍: Rapid Prototyping Journal concentrates on development in a manufacturing environment but covers applications in other areas, such as medicine and construction. All papers published in this field are scattered over a wide range of international publications, none of which actually specializes in this particular discipline, this journal is a vital resource for anyone involved in additive manufacturing. It draws together important refereed papers on all aspects of AM from distinguished sources all over the world, to give a truly international perspective on this dynamic and exciting area. -Benchmarking – certification and qualification in AM- Mass customisation in AM- Design for AM- Materials aspects- Reviews of processes/applications- CAD and other software aspects- Enhancement of existing processes- Integration with design process- Management implications- New AM processes- Novel applications of AM parts- AM for tooling- Medical applications- Reverse engineering in relation to AM- Additive & Subtractive hybrid manufacturing- Industrialisation
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