Mechanical Characterization of Austempered Ductile Iron Obtained by Two Step Austempering Process

Dakre, Vinayak; Peshwe, D. R.; Pathak, S. U.; Likhite, Ajay

doi:10.1007/s12666-017-1099-5

Cited by 15 publications

(5 citation statements)

References 6 publications

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“…Крім того, відсотковий вміст вуглецю в аустеніті залежить в основному від швидкості дифузії атомів вуглецю, яка полегшується високою температурою аустеніту. Тому низка дослідників [18][19][20][21] запропонувала двоетапний процес ізотермічного загартування для отримання дрібноголчастого фериту та стабільнішого аустеніту з вищим вмістом вуглецю в матриці ADI для поліпшення механічних властивостей. У двоетапному процесі повністю аустенізований високоміцний чавун спочатку охолоджують до низької температури (250-265°С, витримка 5 хв.)…”

Section: вісник приазовського державного технічного університету 2022рunclassified

On the role of residual austenite in improving the complex of properties of ductile cast iron

Dan¹,

Trofimova²

2022

ПДТУ

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This article is analyzing the prospects and ways to expand the field of applying ductile cast iron-high-strength cast iron in technology. Ductile cast iron occupies a special place among structural materials. With the same level of mechanical properties, having less specific weight than steel, it provides less weight of products in comparison with steel. This reduces the consumption of raw materials and energy resources in the manufacture and operation of machines and mechanisms. There is a positive effect both in terms of economy and ecology. In addition, ductile cast iron has better casting properties than steel. In recent years, scientists and engineers have focused their efforts on finding new ways to improve the complex of mechanical and operational properties of ductile cast iron. This will make it possible to expand the field of their application and obtain additional advantages. A very effective direction – obtaining bainite matrix and a great amount of stable austenite in the structure of ductile cast iron by heat treatment allows to realize martensitic transformation in the most loaded parts during their operation and thereby increases adaptability. In this case, in addition to the traditional type of heat treatment - one-stage isothermal hardening, the technology of two-stage isothermal hardening is actively implemented, which allows for providing more dispersed ferrite and more stable austenite in the structure. A fundamentally new approach to obtaining the favorable microstructure of ductile cast iron is the organization of a foundry and heat treatment complex that makes it possible to obtain the ferrite-austenite mixture in the structure of ductile cast iron directly from the cast state, bypassing a separate heat treatment operation

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Section: вісник приазовського державного технічного університету 2022рunclassified

On the role of residual austenite in improving the complex of properties of ductile cast iron

Dan¹,

Trofimova²

2022

ПДТУ

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“…GH3536 is a Ni-based superalloy strengthened by Ni-Cr-Fe-Mo solid solution. Because of its excellent oxidation resistance, corrosion resistance and creep resistance below 900℃, it is widely [15,16] used in hot end components such as aircraft engines and gas turbines [7,8]. Generally, the internal structure of hot end parts is complex, which is difficult to produce by traditional casting methods, while SLM process can easily realize the near net shape of GH3536 alloy complex components [9,10].…”

Section: Introductionmentioning

confidence: 99%

“…In order to overcome these problems, ceramic particles are usually added to the matrix alloy as reinforcements, which can improve the high temperature oxidation resistance [13,14], creep resistance and mechanical strength of the matrix alloy [17][18][19][20]. Researchers used LAM technology to prepare nickel based composites reinforced with nanoparticles.…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Properties of TiCp/GH3536 prepared by Selective Laser Melting

Li,

Liu,

Song

et al. 2023

J. Phys.: Conf. Ser.

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In this paper, TiCp/GH3536 composites were prepared by selective laser melting technology. The effects of volume energy density (VED) on the microstructure, densification, mechanical properties and thermophysical properties of TiCp/GH3536 composites were studied. The results show that the pores and nano TiC clusters in TiCp/GH3536 composites gradually disappear with the increase of VED. The interface between TiC ceramic phase and GH3536 matrix was well bonded, which was a non coherent interface, and there was no interface reactant. The optimal VED of SLM is 96.3 J/mm3, and the specific laser power, scanning rate, scanning spacing and powder layer thickness were 260W, 900 mm/s, 0.1mm and 0.03mm, respectively. The highest density of the composite is 99.96%; The maximum tensile strength and yield strength were 1137.2MPa and 900.6MPa, respectively.

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“…The demand for structural materials is getting higher and higher, especially for light weight, toughness and noise reduction, because of the development of modern industry. A steel that can meet the above requirements at the same time is austempered ductile iron (ADI) [1][2][3][4][5][6][7]. Therefore, among the transmission components of new energy vehicles, ADI [8][9][10] has a broader application prospect.…”

Section: Introductionmentioning

confidence: 99%

Effect of second-step austempering temperature on mechanical damping of austempered ductile iron

Zhang,

Cuo,

Wang

et al. 2023

J. Phys.: Conf. Ser.

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Austempered ductile iron(ADI) has good strength and toughness, which is widely used in aerospace, engineering machinery and automobile manufacturing. In the above application fields, the requirements of safety and comfort are gradually increasing, so ADI is required not only to have excellent mechanical properties, but also to have high damping properties. The performance of ADI is closely related to its heat treatment method. Therefore, it provides a theoretical basis for the application of ADI, and reveals its mechanism to some extent. The influence of two-step ADI’s mechanical properties and damping properties due to two-step austempering quenching temperature is the main content of this paper. The retained austenite with obvious coarsening of bundle ferrite and increased size is the experimental result obtained after the increase of austempering temperature in the second step. After that, when the austempering temperature in the second step increases, the retained austenite content will directly decrease. The tensile strength of ADI will increase first and then decrease with the increase of austempering temperature in the second step. And the value reaches the maximum of 1350MPa at 360°C. The yield strength of ADI, which reaches the maximum value (1252MPa) at 400 °C, will follow the increase of austempering temperature in the second step, and the elongation and impact energy of ADI will gradually decrease. The elongation and impact energy of ADI will gradually decrease with the increase of austempering temperature in the second step. The minimum values of 4.8% and 42J are obtained when the austempering temperature in the second step reaches 400 °C. The impact fracture morphology shows that the fracture mechanism will change from ductile fracture to brittle fracture with the increase of austempering temperature in the second step. The reason why the internal friction value (Q−1) of ADI with different austempering temperatures in the second step increases gradually is the increase of strain amplitude. There are obvious S-K peaks and Ge peaks, that is, the damping characteristics change with frequency.

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Mechanical Characterization of Austempered Ductile Iron Obtained by Two Step Austempering Process

Cited by 15 publications

References 6 publications

On the role of residual austenite in improving the complex of properties of ductile cast iron

On the role of residual austenite in improving the complex of properties of ductile cast iron

Microstructure and Properties of TiCp/GH3536 prepared by Selective Laser Melting

Effect of second-step austempering temperature on mechanical damping of austempered ductile iron

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