Influence of nodule count on residual stresses and distortion in thin wall ductile iron plates of different matrices

Sosa, Amadeo Daniel; Echeverría, María Dolores; Moncada, Osvaldo Julio; Míngolo, N.; Sikora, Jorge Antonio

doi:10.1016/j.jmatprotec.2009.05.010

Cited by 25 publications

(15 citation statements)

References 14 publications

(15 reference statements)

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The type of stress (compression/tension) is significant, i.e. whether the stresses before or after the thermal processes will add up or, on the contrary, diminish [7][8].…”

Section: Resultsmentioning

confidence: 99%

Study of Distortion on the Example of the Rings from Ductile Iron and Cast Steel

Łukasik¹,

Nawrocki²,

Misiak³

et al. 2017

Archives of Foundry Engineering

View full text Add to dashboard Cite

The paper attempts to analyze distortions of cast iron and cast steel rings, after heat treatment cycles. The factors influencing distortion are: chemical composition of material, sample geometry, manufacturing process, hardenability, temperature and heat treatment method. Standard distortion tests are performed on C-ring samples. We selected a ring-model, which approximate the actual part, so that findings apply to gear rings. Because distortion depends on so many variables, this study followed strictly defined procedures. The research was started by specifying the appropriate geometry of the samples. Then, the heat treatment was conducted and samples were measured again. The obtained results allow to determine the value of the resulting distortion and their admissibility. The research will be used to evaluate the possibility of using the material to produce parts of equipment operated under extreme load conditions.

show abstract

“…The type of stress (compression/tension) is significant, i.e. whether the stresses before or after the thermal processes will add up or, on the contrary, diminish [7][8].…”

Section: Resultsmentioning

confidence: 99%

Study of Distortion on the Example of the Rings from Ductile Iron and Cast Steel

Łukasik¹,

Nawrocki²,

Misiak³

et al. 2017

Archives of Foundry Engineering

View full text Add to dashboard Cite

show abstract

“…These values are consistent with data reported in a previous work, which explored the effect of the austempering heat treatment on the RS of ductile iron plates. 40) Consequently, it can be close to -5.9 GPa for TiN and to -3.3 GPa for CrN, independently of the measurement direction. The plastic deformation of the substrates surface layer generated during the grinding process exerts no appreciable influence on the RS of coated samples.…”

Section: Effect Of Substrate Grindingmentioning

confidence: 87%

Residual Stress Analysis in PVD Coated Austempered Ductile Iron

et al. 2013

View full text Add to dashboard Cite

The aim of this work is to study residual stresses (RS) in PVD TiN and CrN coated ADI substrates with different nodule counts, austempering temperatures and surface finishing methods (grinding and polishing). Coatings were applied by arc ion plating using an industrial reactor and different sets of processing parameters. Residual stress measurements were performed by x-ray diffraction using the sin 2 ψ method along two principal axes on the samples surface (parallel and perpendicular to the substrate abrasion direction). The film thickness, hardness and adhesion of each coated sample were also evaluated.The results obtained indicate that RS in TiN and CrN coated samples are compressive irrespective of the different substrates, surface finishing methods and processing parameters utilized. The parallel and perpendicular RS do not vary significantly, indicating a rotationally symmetric biaxial stress state. The RS of the coated samples are not influenced by the different substrate characteristics regarding microstructure, hardness and surface roughness. The microhardness and RS of TiN and CrN coated samples increase with film thickness. The increase in substrate temperature together with the decrease in the values of BIAS voltage, arc current and chamber pressure lead to microhardness and RS reduction. Grinding produces surface hardening and reduction of the compressive RS in the substrates, but causes no variations in the RS of the TiN and CrN coated samples. The adhesion strength quality of TiN and CrN coatings to ADI substrates can be related to indices ranging from HF1 to HF2.

show abstract

“…the chosen values depend on the desired final microstructure (Bosnjak et al, 2001;Yescas, 2003), which is closely related to the required values of mechanical properties. Appropriate values of t  and A t have to be chosen to obtain ADI parts with a full ausferritic matrix, which depend on some characteristics such as the initial microstructure and chemical composition of ductile iron, and the geometry of the parts (Moncada and Sikora, 1996;Sosa et al, 2004;Sosa et al, 2009;Fraś et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

Design of the austempering heat treatment of a ductile iron differential case aided by computer simulation

Boccardo

Dardati

Godoy

et al. 2018

Lat. Am. j. solids struct.

View full text Add to dashboard Cite

Austempered ductile iron is frequently employed in the fabrication of automobile parts due to its good mechanical properties, and its simplicity and low cost of the manufacturing process. The heat treatment design is an important stage, in which parameters such as temperatures and durations are chosen according to the required microstructure, part dimension, and initial characteristics of ductile iron. A coupled thermo-mechanicalmetallurgical model is employed in this work to facilitate the heat treatment design of a ductile iron differential case. The thermal-mechanical model is solved by using a general-purpose software, and the metallurgical model is implemented into it by means of user-defined subroutines. To perform the austempering heat treatment simulation of the part, experimental results were required to complete some basic parameters of the model. In order to select appropriated values of thermal cycle parameters, the numerical model was employed to analyze the influence of austenitizing temperature, and austempering time and temperature in the microstructure, dimensional change of the part, cooling rate, and minimum required time of the heat treatment to obtain a full ausferritic matrix. A good performance of the computational tool was found by comparison of numerical and experimental results. KeywordsDuctile iron differential case, Austempering heat treatment design, Thermo-mechanical-metallurgical analysis, Finite element analysis.

show abstract

Influence of nodule count on residual stresses and distortion in thin wall ductile iron plates of different matrices

Cited by 25 publications

References 14 publications

Study of Distortion on the Example of the Rings from Ductile Iron and Cast Steel

Study of Distortion on the Example of the Rings from Ductile Iron and Cast Steel

Residual Stress Analysis in PVD Coated Austempered Ductile Iron

Design of the austempering heat treatment of a ductile iron differential case aided by computer simulation

Contact Info

Product

Resources

About