Solidification behaviour and mechanical properties of ductile iron castings with varying thickness

Shinde, Vasudev D.; Ravi, B.; Narasimhan, K.

doi:10.1179/1743133612y.0000000024

Cited by 20 publications

(8 citation statements)

References 6 publications

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“…The testing was carried out by allowing the specimen to rub against hardened disc for a given normal load and speed condition. Making use of pin on disc machine test was carried out [7]. The specimens were taken out at regular intervals and the weight was recorded.…”

Section: E Dry Sliding Wear Testmentioning

confidence: 99%

Experimental Analysis of Mechanical Properties, Wear and Corrosion Characteristics of IS400/12 Grade Ductile Iron Casting

Agrawal,

Kumar

2019

IJEAT

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In the present research investigation, ductile iron castings conforming to IS400/12 grade casting were produced using green sand moulds. The castings were produced in a regular production foundry using 1.25T Induction Furnace. The molten metal was subjected to standard desulphurisation and modularisation to get graphite in the nodular form. The molten metal was poured into the sand mould and allowed to solidify. test was held for different loads viz. 300 gm, 400 gm and 500 gm and different speeds conditions viz. 950 r.p.m, 1430 r.p.m and 2130 r.p.m Based on the earlier investigation by the above group the castings were austenitised at 900 o C for 120minutes and quenched in a salt bath consisting of potassium nitrate and sodium nitrate in the ratio of 55:45 and maintained at 310 o C for 120 minutes to bring about austempering treatment. The result in austempered ductile iron will consist of graphite nodules in a matrix of bainite[1,2]. The effect of austempering heat treatment on microstructure, mechanical properties and wear characteristics were studied and compared with the ascast condition. Mechanical properties such as ultimate tensile strength, percentage elongation, hardness and impact strength were determined. Wear tests were carried out to determine the weight loss of specimens; using pin on disc type machine. Wear . The results of the research investigation indicate that the heat treated castings shows higher Ultimate Tensile Setength values (35.93% increase), elongation values (24.2% increase) and Brinell hardness values (12.05% increases) as compared to the as-cast condition of casting. From the dry sliding wear studies, it is seen that heat treated specimensshows higher resistance to wear compared to the ascast specimens.

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Section: E Dry Sliding Wear Testmentioning

confidence: 99%

Experimental Analysis of Mechanical Properties, Wear and Corrosion Characteristics of IS400/12 Grade Ductile Iron Casting

Agrawal,

Kumar

2019

IJEAT

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“…A hardened circular disc having hardness of 64 HRC was used as counter face. The testing was carried out [7] by allowing the specimen to rub against hardened disc for a given normal load and speed condition. Making use of pin on disc machine test was carried out.…”

Section: Cmentioning

confidence: 99%

Experimental Analysis of Mechanical Properties, Wear and Corrosion Characteristics of IS500/7 Grade Ductile Iron Casting

Agrawal*,

Kumar

2019

IJITEE

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In the present research investigation, ductile iron castings conforming to IS500/7 grade casting were produced using green sand moulds. The castings were produced in a regular production foundry using 1.25T Induction Furnace. The molten metal was subjected to standard desulphurisation and modularisation to get graphite in the nodular form. Based on the earlier investigation by the above group the castings were austenitised at 900oC for 120minutes and quenched in a salt bath consisting of potassium nitrate and sodium nitratein the ratio of 55:45 and maintained at 310oC for 120 minutes to bring about austempering treatment. The result in austempered ductile iron will consist of graphite nodules in a matrix of bainite[1,2]. The effect of austempering heat treatment on microstructure, mechanical properties[13,14] andwear characteristics were studied and compared with the as-cast condition. Mechanical properties such as ultimate tensile strength, % elongation, hardness and impact strength were determined. Wear tests were carried out to determine the weight loss of specimens; using pin on disc type machine. Wear test was held for different loads viz. 300 gm, 400 gm and 500 gm and different speeds conditions viz. 950 r.p.m, 1430 r.p.m and 2130 r.p.m. Corrosion tests were carried out to determine corrosion rate at different viz. 35°C & 45°C temperature for increasing duration viz. 2 hours to 24 hours. The results of the research investigation indicate that the heat treated castings shows higher Ultimate Tensile Setength values (54.86% increase), elongation values (64.32% increase) and Brinell hardness values (19.03% increases) as compared to the ascast condition of casting. From the dry sliding wear studies, it is seen that heat treated specimen’s shows higher resistance to wear compared to the ascast specimens and corrosion rate & weight loss due to corrosion in heat treated condition is less compared to ascast ones.

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“…Normal şartlarda grafit sayısının fazla olması yüksek kaliteye işaret etse de farklı boyutlarda parçalar için optimum grafit sayısı aralıkları belirlenmekte ve bu aralıktan çıkılması mekanik özellikleri olumsuz etkileyebilmekte, kaliteyi düşürebilmektedir [4]. Ayrıca küresel grafit sayısındaki artış mikroyapıdaki ferrit/perlit oranını etkilemekte, sayı arttıkça perlit oranı azalmakta, bu azalmanın etkisiyle mukavemet düşerken sünekliğin arttığı gözlenmektedir [5,6]. Dökümhanelerde küreselliği artırmak için uygulanan aşılama işleminden sonra, ferrit/perlit oranını belirlemek için dağlama işlemi de gerçekleştirilmektedir.…”

Section: Introductionunclassified

Küresel Grafitli Dökme Demirin Nodülarite ve Küreselliğinin Görüntü İşleme Yöntemleri Kullanılarak Belirlenmesi

Canbilen¹,

Ürküt²

2020

European Journal of Science and Technology

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ÖzDökümhaneler, endüstrideki önemli parçaların üretimini sağlamaları sebebiyle toplumun en önemli faaliyet eksenlerinden biridir. Dökümhanelerde, farklı elementlerin eritilmesi ve belli oranlarda birleştirilmesiyle elde edilen eriyik malzemeler, çeşitli işlemlere tabi tutulmakta ve kalıplanarak istenen şekle getirilmektedir. Üretilen dökümler, otomotiv ve silah sektörü, havacılık ve denizcilik endüstrisi gibi birçok farklı alanda kullanılmaktadır. Bununla birlikte, kullanıcıların ihtiyacına göre farklı özelliklerde üretilen dökme demirlerin kalite ve standardizasyon işlemlerinin sanayide mühendisler tarafından manuel olarak gerçekleştirilmesi ciddi iş gücü, zaman ve maliyet kayıplarına sebep olmaktadır. Günümüzde hızla ilerleyen teknoloji, kullanıcıların ihtiyaçlarını her geçen gün daha da çeşitlendirmektedir. Bu noktada kalite süreçlerinin hızlandırılması, devamındaki bütün süreçleri hızlandırmakla kalmayacak; iş gücü, zaman ve maliyet kaybını da minimum seviyeye indirecektir. Bu durum göz önünde bulundurularak, bu çalışmada; küresel grafitli dökme demirin nodülarite ve küresellik değerleri baz alınarak bilgisayar destekli bir sistem geliştirilmiştir. Bunun için, Konya Organize Sanayi Bölgesinde faaliyet gösteren bir döküm fabrikasında çeşitli kalitelerde üretilen küresel grafitli dökme demir parçalarına ait 30 adet mikroskop görüntüsü kullanılmıştır. Temelde görüntü işleme metotlarından yararlanarak mikroskop görüntüleri segmente edilmiş, daha sonra mikro yapılardaki nodüllerin yeri, sayısı ve şekillerinin küreselliği hesaplanmıştır. Bu sayede küresel grafitli dökme demir parçalarının bilgisayar ortamında incelenmesi mümkün olmuş ve kalitelerinin otomatik olarak belirlenmesi adına bir ön çalışma ortaya konmuştur. Gerçekleştirilen simülasyonlar, görüntü işleme metotları ile mikroyapıların küresellik değerinin nicel olarak ortaya konabileceğini ve %95,45'lik doğruluk oranı ile nodül sayısının belirlenebileceğini göstermektedir.

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Solidification behaviour and mechanical properties of ductile iron castings with varying thickness

Cited by 20 publications

References 6 publications

Experimental Analysis of Mechanical Properties, Wear and Corrosion Characteristics of IS400/12 Grade Ductile Iron Casting

Experimental Analysis of Mechanical Properties, Wear and Corrosion Characteristics of IS400/12 Grade Ductile Iron Casting

Experimental Analysis of Mechanical Properties, Wear and Corrosion Characteristics of IS500/7 Grade Ductile Iron Casting

Küresel Grafitli Dökme Demirin Nodülarite ve Küreselliğinin Görüntü İşleme Yöntemleri Kullanılarak Belirlenmesi

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