In-situ measurement of phase transformation kinetics in austempered ductile iron

Meier, Leopold; Hofmann, M.; Saal, Patrick; Volk, Wolfram; Hoffmann, Hartmut

doi:10.1016/j.matchar.2013.09.005

Cited by 42 publications

(52 citation statements)

References 30 publications

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“…Cylindrical ADI samples which contain 3.6wt% C, 2.8wt%Si and 0.2wt%Mn with dimension of Ø 6mm × 10 mm were prepared using different heat treatment parameters which yield microstructures as shown in table 1 (it should be noted that here the volume fractions relate only to the metallic matrix since the change in nodular graphite fraction during austempering is negligible [1]). T γ and T Aus where selected according to results published elsewhere [13].…”

Section: Methodsmentioning

confidence: 99%

“…The heat treatment process of ADI consists of austenitization followed by quenching to a temperature typically between 250°C and 450°C and isothermal austempering [1]. After such a heat treatment the microstructure of ADI consists of acicular ferrite (α) and high carbon enriched retained austenite (γ).…”

Section: Introductionmentioning

confidence: 99%

“…The microstructure strongly depends on the austenitization and austempering temperatures. Details on dependence of microstructure and temperature can be found in [1][2][3][4][5][6]. In industrial applications alloying elements such as Ni, Mo or Cu are used in order to delay the phase transition kinetics, which improves the austemperability of heavy sections.…”

Section: Introductionmentioning

confidence: 99%

“…The relationship between heat treatment parameters and phase fractions in ADI has been extensively studied by Meier et al using in-situ neutron powder diffraction on non-textured samples [1]. On the other hand in case of the deformation induced martensitic transformation in ADI quantitative phase analysis is hindered due to texture formation and standard Rietveld analysis fails to produce reliable results.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Strain Induced Martensitic Transformation in Austempered Ductile Iron (ADI)

Saal

Gan

et al. 2016

J. Phys.: Conf. Ser.

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The strain induced martensitic transformation in austempered ductile iron (ADI) has been investigated using high resolution neutron diffraction on samples compressed ex-situ to different plastic strains. In addition bulk texture measurements using neutron diffraction have been performed to calculate the orientation distribution of ferrite and austenite phases for different strain levels. Combing the detailed texture information with neutron diffraction pattern proved to be essential for quantitative phase analysis and extraction of martensite phase fractions. The martensite content induced by strain in ADI depends on austempering temperature and degree of deformation.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Strain Induced Martensitic Transformation in Austempered Ductile Iron (ADI)

Saal

Gan

et al. 2016

J. Phys.: Conf. Ser.

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“…V 0 is the average atomic volume at the reference temperature. From Equation (4), the measured length change is converted into the average atomic volume of the specimen by the following relation [17] [18] :…”

Section: （2）mentioning

confidence: 99%

Dilatometric Analysis of Phase Fractions during Austenite Decomposition in Pipeline Steel

Yan¹,

Fu²,

Zhao³

et al. 2015

Proceedings of the 3rd International Conference on Material, Mechanical and Manufacturing Engineering

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Abstract. Dilatometry is one of the most popular methods for the study of high temperature physical properties of steel and thermal expansion is considered to be an important factor concerning on the crack formation during casting and rolling for pipeline steel. In the present study, dilatometric curve of X60 pipeline steel was measured with the Gleeble-1500 hot simulator. Phase transformation kinetics of austenite decomposition was analysed with the lever rule based on a suggested model. The tested X60 specimen was found to be about 80% of bainite and about 20% of ferrite at room temperature, which is proved by the OM fractography. Precipitation of proeutectoid ferrite film along austenite grain boundary may be responsible for high-temperature brittleness of pipeline steel.

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