The Mechanical Properties of Ductile Iron at Intermediate Temperatures: The Effect of Silicon Content and Pearlite Fraction

Laine, Jarkko; Jalava, Kalle; Vaara, Joona; Soivio, Kaisu; Frondelius, Tero; Orkas, Juhani

doi:10.1007/s40962-020-00473-8

Cited by 20 publications

(15 citation statements)

References 27 publications

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“…For alloyed cast iron, the microhardness of the ferrite is 166 HV (the standard deviation is 1.41 HV) and 282 HV for pearlite were the standard deviation is 2. 16 HV. An increase in the microhardness of various microstructural constituents is observed in alloyed cast iron, compared with unalloyed cast iron.…”

Section: Microhardnessmentioning

confidence: 99%

“…The alloying elements are related to the microstructure, the matrix microstructure and mechanical properties are defined by many of these elements. Up in a particular way, the matrix microstructure affects the hardness of the cast [16,17]. The contents of alloying elements have a very important influence on the structure of the cast iron and of course on the mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

“…The microstructure and the nature of the material are extremely important among these factors. Depending on the composition, the matrix structure of ductile iron can be ferritic, pearlitic, bainitic, or martensitic [13][14][15][16]. One of the most commonly encountered industrial problems is wear, particularly through abrasion, leading to frequent replacement of components.…”

Section: Introductionmentioning

confidence: 99%

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Study of the Influence of Alloying Elements on the Mechanical Characteristics and Wear Behavior of a Ductile Cast Iron

Boulifa

Hadji

2021

Frattura Ed Integrità Strutturale

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In the present work, the influence of alloying elements, on the mechanical characteristics and wear behavior by modification of the chemical composition of the ductile iron was studied, in order to improve these characteristics for the manufacture of agricultural tractors parts in particular front and rear axles, ploughshares, gear crankcase, pinions, transmission shafts, crankshafts, etc... The cast iron investigated was prepared in an induction furnace at 1500°C and inoculated with a ferro-silicon-magnesium to 45% Si and 10% Mg. The specimens were casted into self-hardening sand moulds at 1450°C, after an addition of alloying elements, Manganese (0.6%), Nickel (0.5%), Molybdenum (0.2%) and Vanadium(0.1%)) in the base spheroidal graphite cast iron produced. Various techniques, Optical microscopy, Microhardness, Hardness, Tensile strength, Impact resistance, and Wear tests (Wear resistance and Friction coefficient) were used to characterize these specimens. The obtained results show that the tested samples have ductile iron structures formed by ferrite and pearlite. Moreover, mechanical and wear tests prove that the alloyed cast iron has improved characteristics compared to unalloyed cast iron and shows the positive effect of alloying elements on these characteristics.

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Section: Microhardnessmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Study of the Influence of Alloying Elements on the Mechanical Characteristics and Wear Behavior of a Ductile Cast Iron

Boulifa

Hadji

2021

Frattura Ed Integrità Strutturale

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“…The approach presented in this study relies on numerical analysis, where material properties depend on silicon content and the pearlite fraction. The thermal conductivity 5 and mechanical properties 6 of ductile iron can be described to a large degree as a function of silicon content and the pearlite fraction, as the spheroidal form of graphite contributes relatively little to these material property variables compared to other forms of graphite. These variables are used in the optimization loop shown in Figure 2.…”

Section: Approachmentioning

confidence: 99%

“…The effect of silicon content and the pearlite fraction on thermal conductivity has been studied in earlier work. 5 Thermal conductivity of ferritic-pearlitic ductile irons can be estimated with the following equation: 6 k W mK ¼ 72:56 þ 0:06721t À 21:67Si ð%Þ À 0:2458Pe ð%Þ À 0:000161t 2 þ 2:173Si ð%Þ 2 þ 0:00414tSi ð%Þ þ 0:0541Si ð%ÞPe ð%Þ;…”

Section: Materials and Materials Modellingmentioning

confidence: 99%

Ductile iron optimization approach for mechanically and thermally loaded components

et al. 2020

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The mechanical and thermal properties of ferritic–pearlitic ductile irons vary widely according to their silicon and pearlite contents. Thus, different combinations of silicon and pearlite affect components’ lifetime under mechanical and thermal stress. An excellent example of the usage of such irons is combustion engine cylinder heads. They experience transient thermal loading (heating and cooling) during starting and stopping in addition to mechanical loading (combustion) during engine operation. An optimization approach and calculation models for the estimation of the optimal ductile iron composition are presented in this study. The approach allows selection of the most suitable base composition for subsequent analyses, such as casting simulation and final accurate finite element modelling and fatigue calculations.

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Effect of TiC Particles Addition on Tribological Behavior of Ductile Iron

Williams²,

Qu³

et al. 2023

Tribol Lett

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In order to improve the wear resistance of ductile iron, different contents of TiC particles are added into ductile iron used lost foam casting and the tribological behavior of ductile iron is studied through a ballon-disk sliding test. It is found that with the increase of TiC content, the pearlite content gradually increases, which is attributed to TiC accelerating the diffusion of carbon atoms to cementite and promoting the heterogeneous nucleation of cementite. The increase of pearlite content and the second phase strengthening caused by TiC improve the hardness and tensile strength of ductile iron. Ductile iron has the best tensile strength (498 MPa) and hardness (168 HV1) with a TiC content of 1 wt.%. The wear resistance also increases with increasing TiC content. The wear volume is reduced from 0.14 mm 3 to 0.03 mm 3 , and the main wear mechanism changes from adhesive wear to abrasive wear. The oxide layer produced by frictional heat on the worn surface and the hardened layer produced by strain hardening on the subsurface further improve the wear resistance. Therefore, the wear resistance of ductile iron is affected by the changes of microstructure before and after wear.

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The Mechanical Properties of Ductile Iron at Intermediate Temperatures: The Effect of Silicon Content and Pearlite Fraction

Cited by 20 publications

References 27 publications

Study of the Influence of Alloying Elements on the Mechanical Characteristics and Wear Behavior of a Ductile Cast Iron

Study of the Influence of Alloying Elements on the Mechanical Characteristics and Wear Behavior of a Ductile Cast Iron

Ductile iron optimization approach for mechanically and thermally loaded components

Effect of TiC Particles Addition on Tribological Behavior of Ductile Iron

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