Microstructure Formation and Fracturing Characteristics of Grey Cast Iron Repaired Using Laser

Yi, Peng; Xu, Pengyun; Fan, Changfeng; Yang, Guixia; Liu, Dan; Shi, Yongjun

doi:10.1155/2014/541569

Cited by 6 publications

(4 citation statements)

References 16 publications

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“…As the temperature continuously increases, the primitive ferrite is converted into austenite, with some carbon elements decomposing into austenite. However, because of the rapid cooling rate, some austenite cannot be converted completely and thus turn into residual austenite 20 .…”

Section: Ksmentioning

confidence: 99%

Microstructural Evolution and Phase Transformation in Laser Cladding of Cr and Mo Powder on Grey Cast Iron: Mixture Design of Experiment (DOE)

et al. 2017

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Laser cladding on grey cast iron at high power processing was investigated for microstructural evolution and phase transformation to enhance surface properties. Cladding was designed using a mixture of DOE with peak power (Pp) and pulse repetition frequency (PRF), and a mixture component of Cr and Mo ratio as factors. Microstructural findings indicated absolute elimination of graphite phase from the clad zone, in conjunction with particles evolution occurrence. Meanwhile, Cr, Mo and Fe phases were detected on the clad surface, along with M-C carbide, retained austenite and MoFe formation. The clad surface with addition of Mo exhibited a high hardness value of 945.5 HV 0.1 due to carbide formation. As a result of high peak power penetration into substrate surface, the depth range of clad zone was 53 to 131 µm. From the optimisation, the highest desirability is 82.3 %. Cladding with molybdenum powder addition was found to have produced minimum surface roughness, maximum depth and hardness of 9.14 µm, 110 µm and 891.1 HV 0.1 , respectively.

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Section: Ksmentioning

confidence: 99%

Microstructural Evolution and Phase Transformation in Laser Cladding of Cr and Mo Powder on Grey Cast Iron: Mixture Design of Experiment (DOE)

et al. 2017

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“…Moreover, from their XRD analysis it was evident that with increasing cooling rate (decreasing particle size) the proportion ofFe increased while that of -Fe decreased. However, there was no evidence, either from their XRD or microstructural analysis, of any phases other than ferrite, austenite and Fe 3 C. In a study by Yi et al [9], based on repair technology using the rapid solidification process by laser fusion welding, they discovered that overall crack toughness of the material can be increased around the repaired zone (RZ). This was further explained by Ebrahimnia et al [10] who stated that cracks initiate mostly at the interface of graphite and then propagate through the matrix of a component thereby causing fracture.…”

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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“…In a study by Yi et al [12]based on repair technology using the rapid solidification process of laser fusion welding, they discovered that overall crack toughness of the material can be increased around the repaired zone (RZ). This was further explained by Ebrahimnia et al [13] who stated that cracks initiate mostly at the interface of graphite and then propagate through the matrix of a component thereby causing fracture.…”

Section: Introductionmentioning

confidence: 99%

Microstructure evolution and mechanical properties of drop-tube processed, rapidly solidified grey cast iron

Oloyede

Bigg

Mullis

2016

Materials Science and Engineering: A

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The microstructure, phase composition and microhardness of rapidly solidified grey cast iron BS1452 Grade 250 are compared against the conventionally solidified alloy. Powder samples were prepared using containerless processing via the drop-tube technique. The rapidly cooled droplets were collected and sieved into size range from ≥ 850 µm to ≤ 53 µm diameters corresponding to estimated rates of 200 K s -1 to 23,000 K s -1 . Microstructure evaluations were made by optical and scanning electron microscopy, while XRD was used for identification and analysis of evolved phases. The control sample showed extensive graphite flake formation which was absent in virtually all the droplets samples. With decreasing particle size (increasing cooling rate) we observed an increase in the proportion of Fe 3 C present and the retention of -Fe in preference to -Fe, with the proportion of retained austenite increasing with increasing cooling rate. At the highest cooling rates utilised a Martensitic or acicular ferrite structure was observed. Cooling rates of 200 K s -1 resulted in a doubling of the measured microhardness relative to the as-received (slowly cooled) material. Cooling at the highest rates achieved resulted in a further doubling of the measured microhardness.

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Microstructure Formation and Fracturing Characteristics of Grey Cast Iron Repaired Using Laser

Cited by 6 publications

References 16 publications

Microstructural Evolution and Phase Transformation in Laser Cladding of Cr and Mo Powder on Grey Cast Iron: Mixture Design of Experiment (DOE)

Microstructural Evolution and Phase Transformation in Laser Cladding of Cr and Mo Powder on Grey Cast Iron: Mixture Design of Experiment (DOE)

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

Microstructure evolution and mechanical properties of drop-tube processed, rapidly solidified grey cast iron

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