Effect of a ferritization heat treatment on the fracture toughness of ferritic spheroidal graphite cast iron

Monchoux, Jean‐Philippe; Verdu, Catherine; Fougères, R.

doi:10.1016/s1359-6462(00)00336-5

Cited by 8 publications

(5 citation statements)

References 7 publications

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“…2,3 However it is considered to be difficult to elaborate high strength SG iron with high toughness according to the previous reports. Recently, high strength SG iron with high toughness of as cast sample has been produced by addition of Ni and Mn, but the effect of Ni and Mn on toughness has not been investigated sufficiently.…”

Section: Introductionmentioning

confidence: 99%

Mechanical characteristics of spheroidal graphite cast irons containing Ni and Mn with mixed ferrite and bainitic ferrite microstructure

Nobuki¹,

Hatate²,

Shiota³

2008

International Journal of Cast Metals Research

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This study aims to clarify the influence of additive elements of Ni and Mn on tensile and impact properties of three kinds of spheroidal graphite cast irons (SG irons), which are as cast, annealed and austempered samples. Spheroidal graphite cast irons with Ni (0-4?5 mass-%) and Mn (0-0?5 mass-%) melted by a high frequency induction furnace and cast into a Y block CO 2 mould with 30 mm in thickness. From the viewpoint of heat treatment, tensile strength and hardness of SG irons become larger in the order of ferritised,as cast,austempered ones. Matrix structures of SG irons, which are conducted to austempering treatment from a and c mixture range, consists of bainitic ferrite with high toughness. Austempered SG iron with 3%Ni in 0?1%Mn series is found to become higher tensile strength compound with elongation and toughness of 901 MPa, 17% and 915 kJ m 22 .

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Section: Introductionmentioning

confidence: 99%

Mechanical characteristics of spheroidal graphite cast irons containing Ni and Mn with mixed ferrite and bainitic ferrite microstructure

Nobuki¹,

Hatate²,

Shiota³

2008

International Journal of Cast Metals Research

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“…Spheroidal cast iron is also known as nodular cast iron. Graphitization of carbon is usually achieved by addition of magnesium or cerium as graphite inoculants that cause the formation of graphite nodules (Monchoux et al, 2000).…”

Section: 0mentioning

confidence: 99%

Effect of Heat Treatment Method on the Hardness and Corrosion of Ductile Iron in 3.5% Sodium Chloride Solution

Oluyori¹,

Alao²,

Barnabas³

et al. 2015

IJAAR

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In this research, the corrosion response of heat treated ductile cast iron (DCI) used in the production of engine crank shaft was examined. Five samples were used in this work, one of the samples served as control sample, the remaining four samples were subjected to conventional heat treated operations of annealing, normalizing and hardening. The nodular cast irons were heated to initial austenitic temperature of 900°C, held for one (1hour) in the muffle furnace for homogenization, and samples were now cooled in furnace, air, water and oil respectively. Sodium chloride of 3.5% weight percentage solution was used as environment to study corrosion behaviour of the heat treated ductile cast irons. The microstructural images of the control and heat treated samples were resolved and various developed structures are essentially spheroidal graphite, and pearlitic matrix as in the case of the un-heat treated sample, coarse pearlite matrix for the annealed sample, fine pearlite structure for the normalized sample and partially martensitic and fully martensitic matrix for the oil and water quenched samples. Thus, sample quenched in oil releases an impression of being the materials with the most raised corrosion resistance as a result of more broad scope of passive layers. Oil quenched sample showed best resistance to corrosion in sodium chloride solution with corrosion rate value of 0.0064388mmpy, followed by the air cooled sample with corrosion rate value of 0.008512mmpy. Un-heat treated sample has the highest corrosion rate of 0.2188mmpy. The presence of martensite with less amount of residual improved the corrosion resistance of the ductile iron, also the presence of fine pearlite structure increases the resistance of ductile iron to corrosion in the chosen chloride environment.

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“…The literature of the subject offers a plurality of reports on studies concerning the choice of parameters for gray cast-iron ferritizing heat treatment aimed at improvement of the resistance to cracking [2][3][4] or the fatigue strength [5].…”

Section: Introductionmentioning

confidence: 99%

Archives of Foundry Engineering

Mróz,

Orłowicz,

Tupaj

et al. 2020

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The study presented in this paper concerned the possibility to apply a heat treatment process to ductile cast-iron thin-walled castings in order to remove excessive quantities of pearlite and eutectic cementite precipitates and thus meet the customer's requirements. After determining the rates of heating a casting up to and cooling down from 900°C feasible in the used production heat treatment furnace (v h = 300°C/h and v c = 200°C/h, respectively), dilatometric tests were carried out to evaluate temperatures T gr , TAc 1 start , TAc 1 end , TAr 1 start , and TAr 1 end . The newly acquired knowledge was the base on which conditions for a single-step ferritizing heat treatment securing disintegration of pearlite were developed as well as those of a two-step ferritization process guaranteeing complete disintegration of cementite and arriving at the required ferrite and pearlite content. A purely ferritic matrix and hardness of 119 HB was secured by the treatment scheme: 920°C for 2 hours / v c = 60°C/h / 720°C for 4 hours. A matrix containing 20-45% of pearlite and hardness of 180-182 HB was obtained by applying: 920°C for 2 hours or 4 hours / v c = 200°C/h to 650°C / ambient air.

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Effect of a ferritization heat treatment on the fracture toughness of ferritic spheroidal graphite cast iron

Cited by 8 publications

References 7 publications

Mechanical characteristics of spheroidal graphite cast irons containing Ni and Mn with mixed ferrite and bainitic ferrite microstructure

Mechanical characteristics of spheroidal graphite cast irons containing Ni and Mn with mixed ferrite and bainitic ferrite microstructure

Effect of Heat Treatment Method on the Hardness and Corrosion of Ductile Iron in 3.5% Sodium Chloride Solution

Archives of Foundry Engineering

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