High Silicon Ductile Iron: Possible Uses in the Production of Parts with ^|^ldquo;Dual Phase ADI^|^rdquo; Microstructure

Basso, Alejandro Daniel; Caldera, Martin; Rivera, Graciela Leonor; Sikora, Jorge Antonio

doi:10.2355/isijinternational.52.1130

Cited by 13 publications

(6 citation statements)

References 13 publications

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“…For their realisation, a silicon content of 3.2, 3.8 and 4.3 wt-% is suggested, in particular. [17][18][19][20][21][22] However, due to the high silicon content the SSF DI's maximum and impact strength as well as casting properties are limited. 8,20,[23][24][25][26][27] In addition, for the production of EN-GJS-600-10, realised by a silicon solid solution strengthening, a silicon content of 4.3 wt-% is recommended.…”

Section: Introductionmentioning

confidence: 99%

Influence of nickel and cobalt on microstructure of silicon solution strengthened ductile iron

Weiβß

Brachmann

Bührig–Polaczek

et al. 2015

Materials Science and Technology

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‘Second Generation’ ductile iron with a silicon content of up to 4.3 wt- exhibits a fully ferritic matrix, which is solution strengthened by silicon. Outstanding advantages of these ductile iron grades result in their strongly increasing demand. However, due to a presumed formation of a silicon long range order, the maximum strength is limited to 600 MPa at 4.3 wt- silicon. At higher silicon content, the mechanical properties dramatically decrease. In order to increase the maximum achievable strength, the potential of additional solution strengthening elements is subject of present research. Initially, the effects of cobalt and nickel on matrix, graphite shape and nodule count are investigated. Cobalt and nickel are identified as promising candidates for further solid solution hardening.

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Section: Introductionmentioning

confidence: 99%

Influence of nickel and cobalt on microstructure of silicon solution strengthened ductile iron

Weiβß

Brachmann

Bührig–Polaczek

et al. 2015

Materials Science and Technology

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“…As it was mentioned in a previous work, 13) the use of high silicon DI would be advantageous for components with DPADI structures, since it does not require prior annealing heat treatments. The results reported in the present work allowed to verify that for DI with higher silicon content (melt 3), 2 hours at the intercritical austenitising temperature are enough to reach the equilibrium phase percentage in the production of DPADI structures obtained from as cast condition.…”

Section: Final Considerationsmentioning

confidence: 86%

“…The novelty of this DI is its mixed microstructure, which is composed of different amounts and morphologies of ausferrite (regular ADI microstructure) and free ferrite. [1][2][3][4][5][6][7][8][9][10][11][12][13] This new type of DI has awoken technological interest given the improvement in mechanical properties it has achieved in relation to conventional microstructures (ferritic, pearlitic or martensitic). As a consequence, many studies have centered their attention on assessing the mechanical properties of this new type of DI.…”

Section: Introductionmentioning

confidence: 99%

Development of High Silicon Dual Phase Austempered Ductile Iron

2015

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This work deals with the feasibility of obtaining Austempered Ductile Iron with Dual Phase structures (DPADI) through heat treatment, starting from different as-cast microstructures. The mechanical properties on these microstructures were evaluated. DPADI microstructures were obtained by adding different tenors of silicon (2.4% to 4.2%) to the melts and keeping the other alloying elements constant. The study focused on the determination of the time required to achieve the percentages of equilibrium phases (ferrite and austenite) at different temperatures in the intercritical temperature interval as a function of the starting as cast microstructure. The results showed that, as the silicon content increases, higher amount of ferrite is present in the as cast structure, and the time required to reach the thermodynamic equilibrium phases in the intercritical temperature interval is markedly reduced. Similarly, for a constant chemical composition, as the intercritical austenitizing temperature increases, the time required to reach the quantities of the equilibrium phases decreases.Regarding mechanical properties, the tests revealed that, as expected, as intercritical austenitising temperature increases so do tensile strength and hardness due to the higher ausferrite content in the DPADI matrix.These results indicate that high silicon Ductile Iron (with Si content higher than 3%) with a mostly ferritic microstructure in as cast conditions yields DPADI microstructures able to dispense with prior annealing heat treatments since the time required to reach the phase equilibrium percentages is compatible with the industrial practice and the mechanical properties are similar as compared to DPADI structures deriving from fully ferritic matrices.

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“…ausferritic structures in their microstructures. [1][2][3][4][5][6][7][8] In previous studies, DMS-ADI was named as dual-phase austempered ductile iron (DP-ADI) [9][10][11][12][13][14][15][16] , austempered ductile iron with dualmatrix structure (ADI with DMS) 1-3, 7, 8, 17, 18 , ductile cast iron with dual-matrix structure (DMS) 19,20 , dual-phase matrix austempered ductile iron (DPM-ADI) 21 , dual-matrix ductile iron (DM-DI) 22 , and intercritically austempered ductile iron (IADI). [23][24][25][26][27][28][29][30][31][32] The term dual-matrix structure was used first by Voigt et al in their study.…”

Section: Introductionmentioning

confidence: 99%

Effect of Austempering Times on the Microstructures and Mechanical Properties of Dual-Matrix Structure Austempered Ductile Iron (DMS-ADI)

et al. 2021

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In this study, the effect of the austempering times on the microstructures and mechanical properties of dual-matrix structure austempered ductile iron (DMS-ADI) was investigated. With this aim, unalloyed as-cast ductile iron tensile samples were austenitized at 810 °C for 30 min to intercritical austenitizing followed by austempering at 350°C for various austempering times (45 min to 180 min). Experimental results showed that dual-matrix structures consisting of proeutectoid ferrite ? ausferrite were obtained in austempered ductile iron from intercritical austenitizing temperatures. It was determined that as the austempering time increased, the ausferritic structure became considerably clear and its volume fraction was almost constant (45-47%) after 90 min of austempering time. The yield and tensile strength of the samples decreased and the total elongation and breaking energy increased with increasing austempering times, but after the 120-min austempering time, both the total elongation and breaking energy of the samples decreased. It was established that the austempering times had no significant effect on the morphology of ausferrite. The best mechanical properties were obtained between 70-and 130-minute austempering times that can be defined as the processing window. In addition, it was determined that the DMS-ADI had similar austempering kinetics with the ADI.

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High Silicon Ductile Iron: Possible Uses in the Production of Parts with ^|^ldquo;Dual Phase ADI^|^rdquo; Microstructure

Cited by 13 publications

References 13 publications

Influence of nickel and cobalt on microstructure of silicon solution strengthened ductile iron

Influence of nickel and cobalt on microstructure of silicon solution strengthened ductile iron

Development of High Silicon Dual Phase Austempered Ductile Iron

Effect of Austempering Times on the Microstructures and Mechanical Properties of Dual-Matrix Structure Austempered Ductile Iron (DMS-ADI)

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