Microstructure and fracture of alloyed austempered ductile iron

Erić, Olivera; Rajnović, Dragan; Zec, S.; Šidjanin, Leposava; Jovanović, M.

doi:10.1016/j.matchar.2006.01.014

Cited by 66 publications

(44 citation statements)

References 7 publications

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“…Based on previous studies, [13,14], and available literature, [15,16,17,18], these heat treatment parameters were chosen: austenitization temperature of 900°C, holding time at austenitization temperature of 1 h, holding time at the austempering temperature of 1 h while the austempering temperature ranged from 230°C to 450°C. An experiment plan was developed using "Design Expert" software.…”

Section: Experimental Workmentioning

confidence: 99%

Influence of the Salt Bath Agitation and Austempering Temperature on the Microstructure of Austempered Ductile Iron

Čatipović¹,

Živković²,

Dadić³

et al. 2017

Preprint

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Abstract:In this paper the influence of austempering temperature and salt bath agitation on the final microstructure and mechanical properties of the ferritic ductile iron were studied. 17 samples had been subjected to different heat treatment parameters. Different microstructures were recorded upon the completion of the tests. From the obtained micro images, it is obvious that both the austempering temperature and salt bath agitation affect the final microstructure of the austempered ductile iron. Lower austempering temperatures and salt bath agitation produce more ausferrite in the microstructure, hence the harder and tougher phases are present. This was confirmed with hardness and toughness test of the 17 heat-treated samples. Lower austempering temperatures give more ausferrite phase and therefore higher hardness, but hardness decreases with increasing austempering temperatures. Toughness rises with rising austempering temperatures, but drops significantly with temperatures above 395°C because of the final microstructure.

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Section: Experimental Workmentioning

confidence: 99%

Influence of the Salt Bath Agitation and Austempering Temperature on the Microstructure of Austempered Ductile Iron

Čatipović¹,

Živković²,

Dadić³

et al. 2017

Preprint

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“…1 Typically, the austempered alloyed bainitic ductile consists of discontinuous eutectic carbide, acicular bainite, residual austenite, martensite with graphite dispersed in the matrix [11]. Figure 2 is the corresponding X-ray diffraction pattern of the austempered alloyed bainitic ductile iron, which shows that the microstructural constituents are austenite, M 3 C and M 7 C 3 carbides, martensite and ferrite.…”

Section: Microstructurementioning

confidence: 99%

Effect of deep cryogenic treatment and tempering on microstructure and mechanical behaviors of a wear-resistant austempered alloyed bainitic ductile iron

Chen

Cui

Tong

2015

MATEC Web of Conferences

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Abstract. In this paper, the effect of deep cryogenic treatment in combination with conventional heat treatment process was investigated on microstructure and mechanical behaviors of alloyed bainitic ductile iron. Three processing schedules were employed to treat this alloyed ductile iron including direct tempering treatment, tempering.+deep cryogenic treatment and deep cryogenic treatment.+tempering treatments. The microstructure and mechanical behavior, especially the wear resistance, have been evaluated after treated by these three schedules. The results show that martensite microstructure can be obviously refined and the precipitation of dispersed carbides is promoted by deep cryogenic treatment at .−196 • C for 3 h after tempered at 450 • C for 2 h. In this case, the alloyed bainitic ductile iron possesses rather high hardness and wear-resistance than those processed by other two schedules. The main wear mechanism of the austempered alloyed ductile iron with deep cryogenic treatment and tempering is micro-cutting wear in association with plastic deformation wear.

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“…The saturation of austenite with carbon is insufficient at short austempering time and lower temperature. Hence, austenite is not stabilized and its transformation to martensite upon cooling to room temperature occurs [12]. In the case of ADI alloyed with Cu, martensite was observed only after austempering at 300…”

Section: Microstructure Of Adimentioning

confidence: 99%

“…The quantitative determination of a processing window has attracted great interest in previous years [2,4,[9][10][11][12][13]. The best known criterion of processing window determination is that proposed by Elliott and Bayati [2,13].…”

Section: Introductionmentioning

confidence: 99%

The standard processing window of alloyed ADI materials

Rajnovic¹,

Eric²,

Šidjanin³

2012

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In present paper the effect of austempering conditions and alloying elements on the microstructure, mechanical properties and processing window of Cu and Cu + Ni alloyed austempered ductile irons has been studied. A new concept of "standard" processing window was suggested as an alternative to the well-known "microstructure" processing window. This concept is based on the ability to achieve mechanical properties required by different standards, namely ASTM, ISO and EN. The results obtained show that alloying with Cu + Ni produced ductile grades of ADI, while alloying with Cu grades of higher strength. The standard processing window depends on the austempering parameters and alloying elements, as well as standard used. The ISO and EN standards give a larger standard processing window compared to the ASTM. It was also shown, that from the engineering point of view, determination of a standard processing window gives great advantage compared to the microstructure processing window where special methods and procedures have to be used. K e y w o r d s : austempered ductile iron, microstructure, mechanical properties, standard processing window

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Microstructure and fracture of alloyed austempered ductile iron

Cited by 66 publications

References 7 publications

Influence of the Salt Bath Agitation and Austempering Temperature on the Microstructure of Austempered Ductile Iron

Influence of the Salt Bath Agitation and Austempering Temperature on the Microstructure of Austempered Ductile Iron

Effect of deep cryogenic treatment and tempering on microstructure and mechanical behaviors of a wear-resistant austempered alloyed bainitic ductile iron

The standard processing window of alloyed ADI materials

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