Role of Surface Condition on the Plane Bending Fatigue Behavior of Nodular Cast Iron

Kokavec, Marian; Konečná, Radomila; Nicoletto, Gianni

doi:10.12776/amsc.v3i0.116

Cited by 3 publications

(3 citation statements)

References 14 publications

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“…Most of the fractographic studies focused on ADI are secondary parts of analyses of mechanical properties . Few papers focus on the fractography of DI . In this context, this lack of knowledge may become a limiting factor for the failure analysis of ADI.…”

Section: Introductionmentioning

confidence: 99%

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Fractographic analysis of austempered ductile iron

Fernandino

Boeri

2015

Fatigue Fract Eng Mat Struct

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A B S T R A C T This investigation involves a systematic study of the fracture surfaces of two grades of austempered ductile iron (ADI) broken under quasi-static, dynamic and cyclic loading conditions. The study used electron microscopy, optical microscopy and image postprocessing. The results show that the predominating fracture mechanism in ADI upon impact loading changes from quasi-cleavage to ductile (with little areas of cleavage facets) as the testing temperature increases. Noticeably, even at the lower temperatures tested, the fracture surface of ADI shows clear signs of ductile fracture mechanisms. In particular, graphite nodule cavities suffer marked plastic deformation. Fracture after bending tests at room temperature was characterized by a mix of quasi-cleavage facets, deformation of the contour of nodular cavities and microvoid coalescence. In the case of fatigue fracture at room temperature, the fracture surfaces show a flat appearance which has notorious differences with those reported for other loading conditions, but the typical fatigue striations were not found. The particular features identified on the fatigue fracture surfaces can be used to identify fatigue failures. It was also shown that the determination of the direction of main crack propagation by using the experimental methodology proposed earlier by the authors is applicable to ADI fractured by impact and quasi-static loads.The results provide information potentially useful to fractographic analyses of ADI, particularly in samples that fail in service under unknown conditions.Keywords austempered ductile iron; bending; fatigue; fractography; fracture surface; impact.N O M E N C L A T U R E L' = Projected length of the fracture profile Lt = Fracture profile length Rs = Superficial roughness Ry = Peak to valley ratio from the fracture profile Y = Length of the nodular contour in parallel axis to the main crack propagation direction X = Length of the nodular contour in perpendicular axis to the main crack propagation direction Β = Angle between the major axis of the equivalent ellipse and the main crack propagation direction I N T R O D U C T I O NThe austempered ductile iron (ADI) is a member of the ductile iron (DI) family which is produced by means of an austempering heat treatment. The different grades are produced primarily by varying the austempering temperature and duration of the heat treatment cycle. 1 Nearly twice as strong as pearlitic DI, ADI still retains high elongation and toughness. This combination provides a material with superior tensile strength, wear resistance and fatigue strength. Its usual applications include gears, crankshafts, connecting rods, agricultural and construction ground engaging parts such as plow points, digger teeth and track shoes, shafts; cams; mining and grinding equipment such as balls and hammers; mill liners and rollers; spring hanger brackets and railroad wear applications. Because of its outstanding mechanical properties, ADI represents an excellent choice of replacement for

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Section: Introductionmentioning

confidence: 99%

“…[5][6][7] Few papers focus on the fractography of DI. [8][9][10][11][12][13] In this context, this lack of knowledge may become a limiting factor for the failure analysis of ADI. The goal of this work is to characterize the influence of different loading conditions on the morphology of the fracture surfaces of ADI.…”

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confidence: 99%

Fractographic analysis of austempered ductile iron

Fernandino

Boeri

2015

Fatigue Fract Eng Mat Struct

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“…Shot peening which is a cyclic cold working process introduces a compressive residual stress on the surface by repeated hitting of shots. It has been used for a quite long time to enhance the surface properties such as fatigue life (Roushdy, 1990, Suzuki, 2008& Kokavec, 2011 and SCC resistance (Kirk, 2007& Kritzler, 2002 especially for the marine components. Grain refinement, surface roughness and surface hardness are playing the major role in the benefits of peening (Sanjurjo et al 2010, Singh et al, 2010, Lah et al 2010& Olivier, 2005.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Surface Topography on Duplex Stainless Steel AISI 2205 for Deep Sea Applications

Jebaraj

Kumar

Deepak

2015

International Journal of Surface Engineering and Interdisciplinary Materials Science

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In this investigation, analysis of surface topography on Duplex Stainless Steel (DSS) AISI 2205 was carried out under the shot peened and various machined conditions. The surface profiles of the shot peened, polished, milled, ground and as received conditions were compared in micron level. In order to study the influence of shot peening on the profile of surface roughness, DSS samples were peened using S390 shots for different durations. Severe Plastic Deformation (SPD) was observed on the surface of DSS due to peening. Also, peening has more effect on the austenite phases than the ferrite phases on DSS surface. The shot peened surface profiles obtained using S390 shots offer better topography as compared with the other machined and as received surface conditions. As a part of the study, the effect of dual shot peening was inspected by peening the surface using two shots which introduce lots of micro peaks and valleys on the surface of DSS.

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Interrelationship between Hot Ductility and Particle Size in TiNb IF Steel

Konrádyová

Longauerová

Girman

et al. 2017

MSF

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The aim of this work was to observe the relationship between hot ductility and morphology, distribution and size of particles in TiNb IF steel after hot torsion testing at the critical temperatures of deformation with low as well as maximum values of plasticity. Transmission electron microscopy showed that the particles at all temperatures of deformation with minimum number of turns to failure e.g. 1132°C (33.72 rev.), 946°C (6.24 rev.), 637°C (5.54 rev.) as well as with maximum value of plasticity at 844°C (1726 rev.) were of globular, cuboid or elliptical shape. EDX analysis revealed that there were different types of particles such as carbides, sulfides, and carbonitrides of Ti and Nb, Al and Si oxides, Mn sulfides, and phosphides. Quantitative evaluation of particle size in the carbon extracted replicas showed 20% of total number of particles with size 2r = 30-39 nm and an average linear dimension = 42 nm at the deformation temperature of 1132°C. There were 28% of the particles with size 2r = 20-29nm and = 41nm at the temperature of 946°C while at the temperature of 637°C there were 29% of particles with size 2r = 20-29 and 26% with size 2r=10-19 nm and = 41 nm. In the case of maximum plasticity (1726 rev.) at 844°C, the presence of large particles was confirmed with = 105 nm size and 9% distribution in three size categories of 20-29, 30-39, 90-99 nm.

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Role of Surface Condition on the Plane Bending Fatigue Behavior of Nodular Cast Iron

Cited by 3 publications

References 14 publications

Fractographic analysis of austempered ductile iron

Fractographic analysis of austempered ductile iron

Analysis of Surface Topography on Duplex Stainless Steel AISI 2205 for Deep Sea Applications

Interrelationship between Hot Ductility and Particle Size in TiNb IF Steel

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