Effect of austempering heat treatment on fracture toughness of copper alloyed gray iron

Hsu, Cheng-Hsun; Shy, Yih-Hsun; Yu, Yuan-Hsin; Lee, Shen-Chih

doi:10.1016/s0254-0584(99)00213-8

Cited by 36 publications

(15 citation statements)

References 4 publications

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“…The graphite flake releases carbon into the interface during sliding and reduced wear and friction considerably. The improvement in wear properties due to ausferritic matrix along with graphite flakes has been reported in literatures (Ref [14][15][16]. The wear debris generated is a fine mixture of graphite and iron oxide particulates.…”

Section: Wear Propertiesmentioning

confidence: 76%

Structure and Property Studies on Austempered and As-Cast Ausferritic Gray Cast Irons

Vadiraj

Balachandran

Kamaraj

2009

J. of Materi Eng and Perform

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A high-strength and wear-resistant alloyed gray iron with ausferritic microstructure on solidification directly from molten condition could be made in a Ni and Mo alloyed gray cast iron. The as-cast ausferritic cast iron was compared with two conventionally austempered gray iron with and without Ni and Mo additions. The various phase constitution and volume fractions were analyzed using optical, SEM and XRD analyses. The various aspects of the alloy chemistry and processing conditions have been correlated with the microstructure and mechanical properties obtained. The analysis showed that the Ni-Mo alloyed austempered gray iron and the directly as-cast austempered gray iron had similar phase constitutions. The strength of the direct as-cast alloy with ausferritic microstructure was higher than the others due to its higher austenite content and carbide distribution. The wear rate of the conventionally austempered Ni and Mo containing alloy and direct as-cast ausferritic alloys is 20% of the austempered gray iron without Ni and Mo with friction coefficient less than 0.4.

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Section: Wear Propertiesmentioning

confidence: 76%

Structure and Property Studies on Austempered and As-Cast Ausferritic Gray Cast Irons

Vadiraj

Balachandran

Kamaraj

2009

J. of Materi Eng and Perform

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“…Austempering Temperature: To make ADI with low strength and hardness, but high elongation and fracture toughness, a high austempering temperature of 350-400 • C is chosen, as this generates higher amounts of carbon-stabilized austenite (20-40%) [15], whereas, when a low austempering temperature of <350 • C is selected, this results in high strength and wear resistance but low fracture toughness [16].…”

Section: Introductionmentioning

confidence: 99%

Austempered Ductile Iron (ADI): Influence of Austempering Temperature on Microstructure, Mechanical and Wear Properties and Energy Consumption

Sellamuthu

Samuel

Dinakaran

et al. 2018

Metals

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Alloyed Ductile iron, austenitized at 840 • C for 30 min in a special sealed austempering furnace, was austempered for 30 min in molten salt mixture at 4 trial temperatures of 300 • C, 320 • C, 340 • C and 360 • C. Tensile strength, yield strength, percentage elongation and impact energy were evaluated for the as-cast and austempered samples. Microstructures were investigated using microscopy, coupled with analyzing software and a scanning electron microscopy. The specific wear of samples was tested using pin-on-disc wear testing machine. X-ray diffraction was performed to calculate the amount of retained austenite present in the ausferrite matrix. As-cast microstructure consists of ferrite and pearlite, whereas austempered ductile iron (ADI) contains a mixture of acicular ferrite and carbon enriched austenite, called "ausferrite". Hardness and strength decreased, whereas ductility and impact strength improved with an increase in the austempering temperature. XRD analysis revealed that the increase in austempering temperature increased the retained austenite content. A decrease in wear resistance with austempering temperature was observed. Modified Quality Index (MQI) values were envisaged, incorporating tensile strength, elongation and wear resistance. MQI for samples austempered at 340 • C and 360 • C showed a better combination of properties. About an 8% reduction in energy consumption was gained when the heat treatment parameters were optimized.

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“…Hsu et al [4] improved the fracture toughness of grey iron alloyed with Cu by austempering, with the increase in fracture toughness increasing with retained austenite in the microstructure of the alloy. Hemanth [5], investigated the effect of cryogenic and water quenching on microstructure and mechanical properties of cast iron.…”

Section: Introductionmentioning

confidence: 99%

Effect of rapid solidification on the microstructure and microhardness of BS1452 grade 250 hypoeutectic grey cast iron

Oloyede

Mullis

2017

Journal of Alloys and Compounds

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ReuseUnless indicated otherwise, fulltext items are protected by copyright with all rights reserved. The copyright exception in section 29 of the Copyright, Designs and Patents Act 1988 allows the making of a single copy solely for the purpose of non-commercial research or private study within the limits of fair dealing. The publisher or other rights-holder may allow further reproduction and re-use of this version -refer to the White Rose Research Online record for this item. Where records identify the publisher as the copyright holder, users can verify any specific terms of use on the publisher's website. TakedownIf you consider content in White Rose Research Online to be in breach of UK law, please notify us by emailing eprints@whiterose.ac.uk including the URL of the record and the reason for the withdrawal request. respectively). Microstructural analysis reveals that the as-received bulk sample displayed a graphitic structure while the rapidly cooled samples display decreasing amounts of -Fe as the cooling rate increases. At moderate cooling rates is replaced with and Fe 3 C, while at higher cooling rates with . Microhardness increase with cooling rate but cannot be mapped uniquely onto cooling rate, suggesting undercooling also influences the mechanical properties. Effect of rapid solidification on

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Effect of austempering heat treatment on fracture toughness of copper alloyed gray iron

Cited by 36 publications

References 4 publications

Structure and Property Studies on Austempered and As-Cast Ausferritic Gray Cast Irons

Structure and Property Studies on Austempered and As-Cast Ausferritic Gray Cast Irons

Austempered Ductile Iron (ADI): Influence of Austempering Temperature on Microstructure, Mechanical and Wear Properties and Energy Consumption

Effect of rapid solidification on the microstructure and microhardness of BS1452 grade 250 hypoeutectic grey cast iron

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