Effect of low temperature tempering prior cryogenic treatment on carburized steels

Calzada, Mónica Preciado; Bravo, P.M.; Alegre, J.M.

doi:10.1016/j.jmatprotec.2006.01.011

Cited by 114 publications

(62 citation statements)

References 5 publications

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“…As shown in Figs. 1(e) and 1(f), the deep cryogenic treatment of the CHTWOT probably gives rise to the most homogenized carbide distribution and the smallest carbide size in the microstructure among the AISI D3 samples used in this study [5][6][7][8][9][10][11][12][13][14][15][16]20]. Figure 2 illustrates the XRD patterns of the AISI D3 samples with different treatments.…”

Section: Characterizationmentioning

confidence: 99%

“…The DCTWOT has a hardness of about 1,059 Hv which corresponds to chromium carbide hardness along with untempered martensite. The DCTWOT has the highest hardness among the AISI D3 samples used due to its most retained austenite elimination, most homogenized carbide distribution and most reduction in carbide size [1,3,[5][6][7][8][9][10][11][12][13][14][15][16][17]20]. Figure 4 presents the friction coefficients of the AISI D3 samples with different treatments tested against the alumina and 100Cr6 steel balls for about 25,000 laps at a sliding speed of 3 cm/s under a normal load of 1 N. The friction coefficients of the RAW, CHTWOT and DCTWOT tested against the alumina and steel balls are about 0.83 and 0.86, about 0.81 and 0.82 and about 0.67 and 0.76, respectively, which indicates that the CHTWOT has the lower friction than the RAW as the DCTWOT has the further lower friction.…”

Section: Characterizationmentioning

confidence: 99%

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Effects of deep cryogenic treatment on mechanical and tribological properties of AISI D3 tool steel

et al. 2015

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Abstract:In this study, the effects of deep cryogenic treatment (DCT) on the mechanical and tribological properties of AISI D3 tool steel were investigated together with a systematic correlation between their hardness and wear resistance. It was found that conventionally heat treated AISI D3 tool steel samples were significantly hardened via an additional DCT, which was attributed to the more retained austenite elimination, more homogenized carbide distribution and more reduction in carbide size in the samples. As a result, the hardened AISI D3 samples exhibited reductions in their friction and wear during rubbing against alumina and 100Cr6 steel balls under different normal loads due to the effectively hindered removal of surface materials. The results clearly showed that the DCT was an effective way to improve the mechanical and tribological properties of the AISI D3 tool steel samples as the tribological performance of the tool steel samples was significantly influenced by their hardness.

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Section: Characterizationmentioning

confidence: 99%

Section: Characterizationmentioning

confidence: 99%

Effects of deep cryogenic treatment on mechanical and tribological properties of AISI D3 tool steel

et al. 2015

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“…According to the past studies, the rate of cooling down to sub-zero level may significantly affect the material properties [15,29], where some damage in the form of thermal shock cracks may occur if the rate of cooling is not sluggish enough or due to sudden temperature variations [30,31]. In the present work, the rate of cooling is in the order of 1.5 K min −1 and is slow enough to be helpful to avoid any microcracking [15].…”

Section: Discussionmentioning

confidence: 73%

The effect of cryogenic treatment on ageing behaviour of B4C reinforced 7075 aluminium composites

TASKESEN¹,

Aksöz²,

Özdemir³

2017

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In the current study, an effect of cryogenic treatment on the ageing of a B4C particulate reinforced 7075 aluminium alloy was investigated to identify changes in hardness with respect to ageing time. To achieve this, first, 10, 15, and 25 % by weight B4C particulate containing 7075 Al composite specimens were produced by hot pressing of Al, Cu, Zn, and Mg elemental powders. Next, cryogenic treatment and multiple steps of tempering were adapted to several samples. Such as, after solutionizing at 470• C and sub-zero treatment at -146• C, successive intervals of artificial ageing at 120• C for different time periods were applied. During the heat treatment, hardness values were measured after each interval. Findings reveal that, particularly after solutionization, cryogenic treatment before ageing yields high hardness values. However, the hardness of the composite material exceeds this level during ageing treatment, mainly after long ageing times.K e y w o r d s:

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“…İzotermal dönüşüm süresi ve sonrasındaki soğutma şartlarına göre özellikle kalıntı östenit miktarının değiştiği bilinmektedir [15]. Yeterli soğuma engellenebilmektedir [16]. Özellikle h1 kodlu numunenin sürtünme katsayısının artan yüklemelerdeki düşüşünün mikroyapı içerisinde bulunan kalıntı östenitin gerilme etkisi ile martenzite dönüşümü sayesinde oluştuğu düşünülmektedir.…”

Section: Deneysel çAlışmaunclassified

AISI 4140 Çeliğinin Çeşitli Çift Fazlı Mikroyapılarında Mekanik Özellikleri İle Sürtünme Davranışı İlişkisinin İncelenmesi

Taşdelen¹,

Yeşilyurt²

2015

Nevşehir Bilim Ve Teknoloji Dergisi

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ÖzÇift fazlı çelikler otomotiv sektöründe ihtiyaç duyulan hafif ve dayanıklı malzeme ihtiyacını gidermek amacıyla ilk olarak 1970'li yıllarda geliştirilmişlerdir. Bu tür çelikler ferrit fazı içerisinde dağılmış halde yer alan martenzit fazının varlığı ile yüksek süneklik ve yüksek mukavemeti bir arada sunabilmektedirler. Isıl işlem parametreleri doğru olarak seçildiğinde birçok çelik türü için çift fazlı mikroyapının elde edilmesi mümkündür. Bu çalışmada AISI 4140 çeliğinden hazırlanmış çubuklar kritik sıcaklıklar arası tavlanma işlemini takip eden izotermal dönüşümlere tabi tutularak benzer sertlik değerlerinde çeşitli çift faz mikroyapılarına sahip numuneler elde edilmiştir. Bu numunelerin çekme, darbe dayanımı ve sertlik gibi mekanik özellikleri deneysel olarak belirlenmiş, ayrıca benzer sertlik değerlerine sahip bu yapıların aşınma davranışları incelenmiştir. Bu sonuçlar normalize AISI 4140 çeliğine ait sonuçlar ile karşılaştırılmıştır. Çift fazlı mikroyapı sayesinde benzer sertlik değerleri için daha tok ve sürtünme katsayısı düşük çeliklerin üretilebileceği fakat bunun aşınma nedeniyle oluşan kütle kaybına bir katkısı olmadığı görülmüştür.Anahtar kelimeler: Çift fazlı çelik, mekanik özellik, sürtünme davranışı, aşınma. Investigation of the Relation Between Mechanical Properties and Frictional Behavior of Dual Phase AISI 4140 Steel AbstractDual phase steels were developed firstly in 1970's in order to provide of light and strength materials for automobile industries. Since the presence of distributed martensite phase in the matrix of ferrite phase, these type of steels can be provide both high ductility and high strength in a materials together. Obtaining a dual-phase microstructure for many types of steel is possible by the selection of heat treatment parameters properly. In this study, steel bars prepared from AISI 4140 steel were subjected to some thermal treatment followed by isothermal transformation and various dual phase microstructure in similar hardness specimens were obtained. Some mechanical properties such as impact strength, and hardness of these materials were identified, in also wear behavior of these materials which were in similar hardness is investigated. These results are compared with those of AISI 4140 steel. As a result it seen that with dual phase microstructure it can be produced a materials with more toughness and low friction coefficient, but those properties does not affect the weight loss occurring due to wear.

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Effect of low temperature tempering prior cryogenic treatment on carburized steels

Cited by 114 publications

References 5 publications

Effects of deep cryogenic treatment on mechanical and tribological properties of AISI D3 tool steel

Effects of deep cryogenic treatment on mechanical and tribological properties of AISI D3 tool steel

The effect of cryogenic treatment on ageing behaviour of B4C reinforced 7075 aluminium composites

AISI 4140 Çeliğinin Çeşitli Çift Fazlı Mikroyapılarında Mekanik Özellikleri İle Sürtünme Davranışı İlişkisinin İncelenmesi

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