Effect of tempering conditions on the mechanical properties of ductile cast iron with dual matrix structure (DMS)

Rashidi, A.M.; Moshrefi-Torbati, M.

doi:10.1016/s0167-577x(00)00105-1

Cited by 41 publications

(27 citation statements)

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“…In the newly developed ductile cast iron structure composed of proeutectoid ferrite, and martensite or ausferrite [acicular ferrite and high carbon austenite (stabilized or transformed austenite)] [1][2][3][4][5][6][7][8]. Therefore, it is also called dual matrix structure (DMS).…”

Section: Introductionmentioning

confidence: 99%

Effect of martensite volume fraction and its morphology on the tensile properties of ferritic ductile iron with dual matrix structures

Kocatepe

Cerah

Erdoğan

2006

Journal of Materials Processing Technology

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Section: Introductionmentioning

confidence: 99%

Effect of martensite volume fraction and its morphology on the tensile properties of ferritic ductile iron with dual matrix structures

Kocatepe

Cerah

Erdoğan

2006

Journal of Materials Processing Technology

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“…In the newly developed ductile cast iron with dual matrix structure, [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20] the structure consists of proeutectoid ferrite, and ausferrite (bainitic ferrite and high carbon austenite (it is also called retained, stable or transformed austenite) or martensite. Therefore it is also called Dual Matrix Structure (DMS).…”

Section: Introductionmentioning

confidence: 99%

“…Therefore it is also called Dual Matrix Structure (DMS). [1][2][3][4][5][6][7][8][9][10][11] Austempered ductile iron (ADI) with DMS has been found to be validated for suspension parts of the automotive, owing to its greater ductility than the conventionally heat treated austempered ductile iron. This material showed tensile and proof stress, together with hardness, similar to pearlitic grades, and ductility at the same level as ferritic grades.…”

Section: Introductionmentioning

confidence: 99%

“…This material showed tensile and proof stress, together with hardness, similar to pearlitic grades, and ductility at the same level as ferritic grades. [1][2][3][4] The fatigue properties of ductile iron and ADI have been studied by many investigators and several studies have been reported the relationship between fatigue strength and austempered microstructure. The fatigue strength of ADI was superior to those of ferritic, pearlitic and quenched and tempered grades.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Microstructure on Fatigue Strength of Intercritically Austenitized and Austempered Ductile Irons with Dual Matrix Structures

2013

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In the present study the fatigue strength of austempered ductile irons with dual matrix structures (ADI with DMS) has been studied for an unalloyed ductile cast iron. For this purpose, specimens were intercritically austenitized (partially austenitized) in two phase region (α + γ ) at various temperatures (810°C, 820°C and 830°C) for 20 minutes and then quenched into salt bath held at austempering temperature of 315°C and 375°C for 120 minutes and then air cooled to room temperature to obtain various ausferrite volume fractions and their morphologies. Conventionally austempered specimens (austempered from 900°C) with fully ausferritic matrix and unalloyed as cast specimens having ferrit + pearlite structures were also tested for a comparison. Rotating bending fatigue test were carried out an the experimental results showed that, in ADI with DMS, volume fraction of ausferrite and continuity of ausferritic structure along intercellular boundaries play important role in determining fatigue strength. The fatigue strength of these specimens increases with increasing ausferrite volume fraction. The fatigue strength was correlated with the ausferrite volume fraction and high carbon austenite and its carbon content. Conventionally austempered specimens exhibited much greater fatigue strength than ADI with DMS specimens.KEY WORDS: austempered ductile iron; dual matrix structure; fatigue; ausferrite volume fraction.

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“…The matrix of a dual phase ADI is composed by ausferrite (as in regular ADI microstructure) and free or allotriomorphic ferrite, in an attempt to combine the high tensile strength and toughness of the ausferrite with the high ductility of ferrite. [15][16][17][18][19][20][21][22][23][24] Different methodologies have been applied to obtain dual phase microstructures. [15][16][17][18][19][20] The simplest method seems to be that described by Basso et al 21,22) and Kilicli et al, 23,24) which consists of an incomplete austenization stage at temperatures within the intercritical interval, where austenite (γ) ferrite (α) and graphite (Gr) coexist (Fig.…”

Section: Introductionmentioning

confidence: 99%

Development and Characterization of a New Type of Ductile Iron with a Novel Multi-phase Microstructure

et al. 2011

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Over the last few years two new types of Ductile Iron (DI) have been developed based on Austempered DI (ADI), called Dual Phase ADI and Carbidic ADI (CADI), respectively. In the light of the experience acquired when studying these DI variants, the authors found motivating the possibility of obtaining a new type of multi-phase DI (MPDI), combining their main microstructural characteristics. A DI melt alloyed with 2%Cr, exhibiting free carbides and a pearlitic matrix in its as-cast condition, was used. The upper (UCT) and lower (LCT) critical temperatures of the Fe-C-Si equilibrium diagram region, where ferrite (α), austenite (γ) and graphite (Gr) coexist (called "intercritical interval"), were determined by heat treatment and microstructural analysis on samples previously annealed. Carbides stability was studied, and its dissolution was found to be negligible. It was possible to obtain free or allotriomorphic ferrite and austenite by isothermal austenitizing at temperatures within the intercritical interval, and then transform the remaining austenite into ausferrite after an austempering step. Therefore, multi-phase microstructures composed of graphite nodules, free carbides, free ferrite and ausferrite were obtained. The possibility of obtaining MPDI directly from the as-cast structure was also analyzed, and it was found that very similar microstructures to those previously annealed can be obtained by austenitizing samples at the same temperature range. These results proved that the pearlite → austenite transformation kinetics is rapid, as it took only one hour for the transformation to occur.

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Effect of tempering conditions on the mechanical properties of ductile cast iron with dual matrix structure (DMS)

Cited by 41 publications

References 1 publication

Effect of martensite volume fraction and its morphology on the tensile properties of ferritic ductile iron with dual matrix structures

Effect of martensite volume fraction and its morphology on the tensile properties of ferritic ductile iron with dual matrix structures

Effect of Microstructure on Fatigue Strength of Intercritically Austenitized and Austempered Ductile Irons with Dual Matrix Structures

Development and Characterization of a New Type of Ductile Iron with a Novel Multi-phase Microstructure

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