Microstructural control in hot working of IN-718 superalloy using processing map

Srinivasan, N.; Prasad, Y. V. R. K.

doi:10.1007/bf02652327

Cited by 110 publications

(58 citation statements)

References 14 publications

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“…(8,9) Podem-se observar tensões críticas e de pico mais elevadas que no ensaio com taxa 0,01 s -1 , além de que o estado estacionário é "retardado" pela maior taxa de deformação na temperatura de 1.000°C. Para 1.100°C, o estado estacionário é atingido com o mesmo nível de deformação do ensaio anterior, mas em patamar mais alto de tensão.…”

Section: Curvas De Escoamento Plástico Da Liga 718unclassified

Análise Crítica Da Base De Dados De Software De Simulação Numérica Para Conformação a Quente Da Liga Vat® 718

Jarreta¹,

Souza²,

Balancin³

et al. 2008

TMM

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tros de processo.(1) Os processos de conformação mecânica utilizados na Villares Metals são os de forjamento com matriz aberta e laminação. Para a realização das simulações dos processos, assim como suas análises, são necessárias corretas propriedades mecânicas dos materiais envolvidos, de forma que o processo fique bem caracterizado para ser implementado na rota de produção das ligas conformadas. INTRODUÇÃOProjetos recentes na área de simulação numérica de processos termomecânicos têm sido focados no estudo do comportamento de ligas à base de níquel, ResumoA simulação numérica dos processos de conformação plástica de materiais metálicos demanda bases de dados confiáveis dos materiais envolvidos. Neste sentido, torna-se necessário caracterizar com maior precisão o material, realizando ensaios para obtenção das curvas de escoamento plástico; no presente estudo, esta determinação foi realizada para liga VAT ® 718 (equivalente à liga Inconel ® 718). As curvas foram obtidas através de ensaios de torção a quente e comparadas com a base de dados do software DEFORM 3D TM , como investigação da confiabilidade dos dados e adequação à realidade do processamento. Os resultados obtidos com a simulação física evidenciam os mecanismos metalúrgicos envolvidos na deformação a quente, os quais não são considerados nos dados obtidos na literatura para a liga em questão. Em estudos futuros, os dados obtidos neste trabalho serão utilizados para simular numericamente com maior precisão o processo de conformação a quente por forjamento em matriz aberta da liga VAT ® 718. Palavras-chave: Superligas; Liga de níquel; Curva de escoamento; Modelagem numérica. CRITICAL ANALYSIS OF THE NUMERICAL SIMULATION SOFTWARE DATABASE FOR HOT FORMING OF VAT ® 718 ALLOY AbstractNumerical simulation of metal forming processes needs a reliable database of the materials involved. Therefore, it becomes necessary to characterize precisely the material, by doing tests to achieve the flow stress curves; in the present study, such determination was done for VAT ® 718 (corresponding to Inconel ® 718) alloy. The curves were acquired by hot torsion test and compared to the database of DEFORM 3D TM , as an investigation of the database reliability and suitability to the real process. Physical simulation results evidence the metallurgical mechanisms involved in hot deformation, which is not considered in the present literature data for the alloy. In future studies, the obtained data will be applied to accurate numerical simulation of VAT ® 718 hot forming processes, in open die forging.

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Section: Curvas De Escoamento Plástico Da Liga 718unclassified

Análise Crítica Da Base De Dados De Software De Simulação Numérica Para Conformação a Quente Da Liga Vat® 718

Jarreta¹,

Souza²,

Balancin³

et al. 2008

TMM

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“…Microstructural development is described using a number of purpose-built routines, which have been incorporated into the code. The dominant mechanisms for microstructural development during ingot breakdown are taken to be static recrystallisation and grain growth, which occur during periods of dwell between successive bites [ 16,171. Previous observations assume that dynamic recrystallisation has a negligible influence on the evolving structure [18,19], which has been demonstrated to occur under specific conditions of temperature and strain-rate [20].…”

Section: The Process Modelmentioning

confidence: 99%

Microstructural Evolution of Nickel-Base Superalloy Forgings during Ingot-to-Billet Conversion: Process Modeling and Validation

Dandre¹,

Walsh²,

Evans³

et al. 2000

Superalloys 2000 (Ninth International Symposium)

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A computer-based process modelling capability has been developed to simulate the evolution of microstructure during ingot-to-billet conversion of nickel-base superalloys. A unique feature of the model is the incorporation of rules describing the dynamic and static recrystallisation phenomena that govern microstructural development. Computational investigations consider the influence of process control parameters such as die velocity and displacement to obtain an optimal microstructure. Furthermore, a comparison is made of the effective strain profiles obtained by squeezing flat versus rounded sections of the workpiece.The details of the model are given with particular emphasis placed on the description of microstructural evolution. A comprehensive testing programme using a purpose built compression testing machine has been carried out to acquire the materials data required for the model. The analysis of the flow curves is described. The microstructural model has been implemented within the three-dimensional visco-plastic Forge3"t finite element software. In order to validate the methodology developed, interrupted cogging trials have been performed. The evolution of microstructure is explained in terms of the cogging model and a more optimal process procedure suggested.Nickel-base superallovs for disc annlications

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“…High deformation resistance of Ni-Fe alloys is caused by a complex phase composition, high activation energy for hot working and a low rate of dynamic recrystallization. When choosing the conditions for hot plastic working of Ni-Fe alloys, the following factors should be considered [6][7][8][9][10]: the matrix grain size, plastic deformation parameters and the * SILESIAN UNIVERSITY OF TECHNOLOGY, FACULTY OF MATERIALS ENGINEERING AND METALLURGY, 8 KRASIŃSKIEGO STR., 40-019 KATOWICE, POLAND. # Corresponding author: kazimierz.ducki@polsl.pl course of the recrystallization process.…”

Section: Introductionmentioning

confidence: 99%

The characteristic of deformability and quantitative description of the microstructure of hot-deformed Ni-Fe superalloy

Ducki

Rodak

Mendala

et al. 2017

Archives of Metallurgy and Materials

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The paper presents the results of research concerning the influence of hot plastic working parameters on the deformability and microstructure of a Ni-Fe superalloy. The research was performed on a torsion plastometer in the range of temperatures of 900-1150°C, at a strain rates 0.1 and 1.0 s -1 . Plastic properties of the alloy were characterized by the worked out flow curves and the temperature relationships of flow stress and strain limit. The structural inspections were performed on microsections taken from plastometric samples after so-called "freezing". The stereological parameters as the recrystallized grain size, inhomogenity and grain shape have been determined. Functional relations between the Zener-Hollomon parameter and the maximum yield stress and the average grain area have been developed and the activation energy for hot working has been estimated.

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Microstructural control in hot working of IN-718 superalloy using processing map

Cited by 110 publications

References 14 publications

Análise Crítica Da Base De Dados De Software De Simulação Numérica Para Conformação a Quente Da Liga Vat® 718

Análise Crítica Da Base De Dados De Software De Simulação Numérica Para Conformação a Quente Da Liga Vat® 718

Microstructural Evolution of Nickel-Base Superalloy Forgings during Ingot-to-Billet Conversion: Process Modeling and Validation

The characteristic of deformability and quantitative description of the microstructure of hot-deformed Ni-Fe superalloy

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