Development of simulation tool for predicting distortion and residual stress in nitrided parts

Arimoto, Kyozo; Ikuta, Fumiaki; Yamanaka, Shigeru; Funatani, Kiyoshi

doi:10.1504/ijmmp.2010.037615

Cited by 7 publications

(9 citation statements)

References 10 publications

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“…A literatura sugere que a nitretação atinge uma considerável profundidade de endurecimento e gera tensões residuais compressivas [18][19][20][21]. A presença de tensões residuais compressivas na superfície de um componente é um fator que reduz a chance de iniciação de trincas de fadiga mecânica e, consequentemente, de fadiga térmica [22].…”

Section: Tensão Residual Em Peças Nitretadasunclassified

Efeito Da Temperatura No Alívio De Tensões Residuais Presentes Na Camada Nitretada

Gonçalves¹,

Tschiptschin²,

Haddad³

2014

ABM Proceedings

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ResumoO processo de injeção sob pressão de ligas de alumínio é empregado para a produção de peças diversas, destinadas principalmente à indústria automobilística, com a possibilidade de produzir peças complexas, contendo seções delgadas, e a alta velocidade de produção. O reduzido tempo de ciclo e as elevadas temperaturas envolvidas promovem danos por fadiga térmica na superfície de trabalho das matrizes, que crescem com o aumento da produção até atingirem condições que inviabilizam o uso da matriz. O presente trabalho visou estudar o efeito da nitretação na superfície do material, relacionando-o aos aspectos microestruturais e tensões residuais inseridas durante nitretação. O aço AISI H13, foi tratado para dureza de 45 HRC e posteriormente nitretado sob plasma em diversas condições de temperatura, tempo e composição da atmosfera gasosa. Os resultados obtidos mostraram que as variações dos parâmetros de nitretação afetam os perfis de dureza e de tensões residuais presentes nas camadas nitretadas, bem como os microconstituintes das mesmas. O material nitretado, após ser submetido a temperaturas da ordem de 600°C, apresentou redução no nível de tensões residuais de compressão, ocorrendo processo de alívio de tensões. O mesmo efeito não foi tão fortemente verificado no perfil de dureza do material. Palavras-chave: Nitretação sob plasma; Injeção sob pressão de alumínio; Fadiga térmica; Tensões residuais. THE EFFECT OF TEMPERATURE ON THE RESIDUAL STRESS RELIEF PRESENTS IN NITRED LAYER AbstractThe process of pressured injection of aluminum alloys is made use of in the production of sundry parts, meant mainly for the automotive industry, among the main advantages of such process there stands out the possibility of production of complex parts, with thin sections, and at a high output speed. The reduced cycle time and high temperatures involved cause damage due to the thermal fatigue on the working surface of dies. The present paper has aimed at studying the nitrinding effect on material surface by relating it to the microstructural aspects of the surface, residual tensions inserted during the nitriding process. AISI H13 were quenched and tempered to hardness in 45 HRC and later subjected to plasma nitriding in different conditions of temperature, time, and gas atmosphere composition. Results obtained have shown that the variation of nitriding parameters, such as time, temperature, and nitrogen percent, affect the hardness and residual tension profiles present in the surface nitriding, as well as in its microcomponents. The resulting material, after being subjected to high temperature, presents a reduction of level in the residual tensions of compression, bringing about a process of tensions relief. The same effect is not so strongly verified in the material hardness profile.

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Section: Tensão Residual Em Peças Nitretadasunclassified

Efeito Da Temperatura No Alívio De Tensões Residuais Presentes Na Camada Nitretada

Gonçalves¹,

Tschiptschin²,

Haddad³

2014

ABM Proceedings

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“…Therefore, it would be highly beneficial to have at one's disposal a model that links the inward diffusion of I with the (depth-and time-dependent) precipitation state (volume fraction, number density, and size distribution) of the M y I z particles so that the microstructure of the alloys can be predicted and optimized. [1] Until now a series of attempts have been made to simulate inward diffusion of I and simultaneous precipitation of M y I z , [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20] usually focusing on one specific (extreme) case of inward diffusion and precipitation. A simple model of coupled diffusion and precipitation was thus developed for the case of internal oxidation [2,3] and later applied to nitriding [4] and carburizing.…”

Section: Introductionmentioning

confidence: 99%

“…The model was generalized by considering a finite solubility of I, leading to some amount of dissolved I ahead of the reaction front during the precipitation; [6] in this variant, the model has been widely applied to carburizing [7][8][9] and nitriding. [10][11][12][13][14][15][16][17][18][19] A serious shortcoming of the type of models introduced earlier [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19] is the disregard of the kinetics (the time and temperature dependencies) of the precipitation reaction. Moreover, these models describe the evolution of only the total amount of precipitated M y I z and cannot predict number density and size (distribution) of the precipitates.…”

Section: Introductionmentioning

confidence: 99%

“…[25,26] In some investigations, this effect was taken into account, [10,12,16,18] but it has been disregarded in many other studies, [11,[13][14][15]17,19,20] where instantaneous establishment of a (equilibrium) dissolved N concentration at the surface was assumed.…”

Section: Introductionmentioning

confidence: 99%

“…[31] * Yet, most of the diffusion-precipitation coupled models for internal nitriding published until now ignore this distinct role of excess N. [10,12,[16][17][18]20] The purpose of this study is to develop a, in the sense of the earlier discussion, complete model for coupling the inward diffusion of I and the precipitation of M y I z , for the case of nitriding iron-based alloys, which serves as a model for similar other thermochemical surface treatments. The nitride-precipitation kinetics will be described by a time-and temperature-dependent model for nucleation and growth of second-phase particles, based on a description of the evolution of the PSD, as a function of nitriding depth.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Coupling Inward Diffusion and Precipitation Kinetics; the Case of Nitriding Iron-Based Alloys

Jung

Meka

Rheingans

et al. 2016

Metall Mater Trans A

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A model that describes the inward diffusion of an element I into a solid substrate and the simultaneous precipitation of a compound M y I z , with M as the alloying element initially dissolved in the substrate matrix, is presented for the case of nitriding iron-based alloys. The model was developed by coupling the diffusion kinetics and the precipitation (nucleation and growth) kinetics. Additionally, the role of excess nitrogen and the kinetics of ammonia dissociation at the iron surface were incorporated into this coupled model. The model was successfully applied to the case of nitriding an Fe-2.23 at. pct V alloy; the simulation results are in good agreement with the measured data and allow for detailed understanding of the evolution of the nitride precipitates (volume fraction, number density, and size distribution) as a function of both nitriding time and depth in the specimen. The present model exposed the pronounced effects of the precipitation kinetics, of excess nitrogen, and of the surface-reaction kinetics on the overall nitriding kinetics and demonstrated a striking, nonmonotonous change with time of precipitate particle size at a distinct depth in the specimen.

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Studies on distortions in nitrided steel cylinders using computer simulation

Arimoto¹,

Ikuta²,

Yamanaka³

2012

IJMMP

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Development of simulation tool for predicting distortion and residual stress in nitrided parts

Cited by 7 publications

References 10 publications

Efeito Da Temperatura No Alívio De Tensões Residuais Presentes Na Camada Nitretada

Efeito Da Temperatura No Alívio De Tensões Residuais Presentes Na Camada Nitretada

Coupling Inward Diffusion and Precipitation Kinetics; the Case of Nitriding Iron-Based Alloys

Studies on distortions in nitrided steel cylinders using computer simulation

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