Influence of chemical composition and prior microstructure on diode laser hardening of railroad steels

Shariff, S.M.; Pal, Tapan Kumar; Padmanabham, G.; Joshi, Shrikant V.

doi:10.1016/j.surfcoat.2013.03.046

Cited by 39 publications

(24 citation statements)

References 31 publications

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“…It exhibits high hardenability, excellent toughness and wear resistance suitable for hot work applications such as pressure die casting tools, extrusion tools, forging dies etc. Currently, the literature information about laser surface hardening (LSH) of AISI H11 steel in its quenched and tempered (QT) condition is rather limited, compared to the more examined AISI H13 steel [6,7]. The AISI H11 and AISI H13 steels, used in the same applications, are characterized by mutually similar chemical compositions, basically differing only within their vanadium content.…”

Section: Introductionmentioning

confidence: 99%

The Effects of Laser Surface Hardening on Microstructural Characteristics and Wear Resistance of AISI H11 Hot Work Tool Steel

Šebek¹,

Falat²,

Kováč³

et al. 2017

Archives of Metallurgy and Materials

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The present study deals with the effects of laser surface treatment on microstructure evolution and wear resistance of AISI H11 hot work tool steel in quenched and tempered condition. The most upper laser-affected zone is characterized by re-melted microstructure consisting of dendrite cells with fresh non-tempered martensite, retained austenite and inter-dendritic carbidic network. The subsolidus microstructure just beneath the re-melted zone represents the most laser surface hardened zone consisting of fresh non-tempered martensite with fine and coarse carbides as a result of overheating the original QT substrate microstructure. The highest microhardness values in the range from 775 to 857 HV were measured for the LSH microstructure and the most softened microstructure exhibited the minimum hardness of 530 HV. The laser treated samples showed the improvement of their surface wear resistance by 35%.

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Section: Introductionmentioning

confidence: 99%

The Effects of Laser Surface Hardening on Microstructural Characteristics and Wear Resistance of AISI H11 Hot Work Tool Steel

Šebek¹,

Falat²,

Kováč³

et al. 2017

Archives of Metallurgy and Materials

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“…The manifold advantages of laser surface engineering over conventional surface engineering techniques include a very fast and flexible processing ability, a high heating/cooling rate with minimum or no distortion, and a narrow heat affected zone. In the past, several attempts have been made to improve wear and corrosion resistance properties of different grades of steel by laser surface hardening and melting approaches [8][9][10]. Wallace et al [11] showed that rapid cooling during heat treatment of AISI H13 tool steel from austenitizing temperature leads to enrichment of the surface with alloying elements in solid solution and fine distribution of alloy carbides resulting in development of a very hard surface extending die service life.…”

Section: Introductionmentioning

confidence: 99%

Wear and corrosion behavior of laser surface engineered AISI H13 hot working tool steel

Telasang

Majumdar

Padmanabham

et al. 2015

Surface and Coatings Technology

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149

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“…The laser complexes equipped with fiber and other lasers with power of 1-6 kW can carry out operations of hardening of parts from constructional steel and cast iron with depth of layer by 1.0-2.0 mm [9][10][11][12][13]. до 9 мм/с и мощности лазера до 1 130 Вт получена зона упрочнения с глубиной 0,68 мм, и твердо-стью 515 HV.…”

Section: Vpbirukov Candidate Of Technical Sciences a Ablagonravmentioning

confidence: 99%

“…Лазерные комплексы, оснащенные волокон-ными и другими лазерами мощностью 1-6 кВт, могут выполнять операции по закалке деталей из конструкционных сталей и чугунов с глуби-ной слоя 1,0-2,0 мм [9][10][11][12][13]. Однако конструкция портальных систем для резки, которые в слу-чае простоя можно использовать для лазерного упрочнения, как правило, не позволяет пере-мещать оптическую головку по высоте более чем на 100 мм.…”

Section: Study Techniqueunclassified

Computational and Experimental Determination of Hard Band Areas Parameters for Laser Hardening of Cast Iron and Steel

Birukov¹

2017

FRos

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Технология лазерного термоупрочнения чугунов и сталей повышает твердость, износостойкость и задиростойкость рабочих поверхностей трения. Представлены результаты испытаний и эксплуатации пары трения, прошедшей лазерное термоупрочнение, в сравнении с традиционными технологиями упрочнения. Выявлены условия и режимы лазерной обработки, снижающие негативное влияние зон отпуска и повышающие производительность лазерной закалки в 1,6-2,5 раза. П ри назначении режимов лазерного терми-ческого упрочнения (ЛТУ) поверхностей трения деталей машин необходимо учи-тывать условия их эксплуатации, механические и теплофизические свойства исходных матери-алов. Производительность лазерной обработки определяется глубиной и площадью упрочнен-ной поверхности. Для повышения износостойко-сти втулки дизеля в два раза достаточно упроч-нить 25% площади рабочей поверхности зеркала цилиндра. Задиростойкость цилиндропоршне-вой группы при этом повышается в 1,8 раза [1]. Экспериментально было установлено, что при упрочнении 50% поверхности трения образцов стали 45, 40Х при испытании на машине тре-ния возвратно-поступательного движения МТВ-1 в паре с контробразцом из чугуна СЧ20 износо-стойкость повышается в 3 раза, а при 100%-ном упрочнении -в 3,3 раза по сравнению с неупроч-ненными образцами [2]. По задиростойкости закаленные лазером образцы не уступает азоти-рованным сталям 40Х и 12ХН3А и значительно -в 1,7 раза -превосходят цементованнную сталь The technology of laser thermal hardening of cast iron and steel increases the hardness, wear resistance and scoring resistance of functional surfaces of friction. The results of tests and operation of friction couple which has passed laser thermal hardening are given in comparison with traditional technologies of hardening. The conditions and the modes of laser processing reducing negative impact of drawingback areas and increasing the effectiveness of laser hardening by 1.6-2.5 times are revealed. W hen assigning the modes of laser thermal hardening (LTH) of friction surfaces of machine parts, it is necessary to consider the conditions of their operation, mechanical and thermo-physical properties of initial materials. The effectiveness of laser processing is defined by depth and the area of the hardened surface. In order to increase wear resistance of the diesel liner by two times, it is enough to harden 25% of the effective area of cylinder bearing surface. The scoring resistance of cylinder-piston group thus increases by 1.8 times [1]. It has been established experimentally that when hardening 50% of friction surface of the samples made of steel 45, 40H when testing on friction machine of reciprocating motion MTV-1 together with counter sample made of cast iron SC20, wear resistance increases by 3 times, and when hardening is 100% -by 3.3 times in comparison with not hardened samples [2]. According to scoring resistance, laser-hardened samples do not concede to nitrated steel 40X and 12HN3A and considerably exceed cemented steel 18HGT by 1.7 times. For laser hardening of steels 45 and 40H with diame...

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Influence of chemical composition and prior microstructure on diode laser hardening of railroad steels

Cited by 39 publications

References 31 publications

The Effects of Laser Surface Hardening on Microstructural Characteristics and Wear Resistance of AISI H11 Hot Work Tool Steel

The Effects of Laser Surface Hardening on Microstructural Characteristics and Wear Resistance of AISI H11 Hot Work Tool Steel

Wear and corrosion behavior of laser surface engineered AISI H13 hot working tool steel

Computational and Experimental Determination of Hard Band Areas Parameters for Laser Hardening of Cast Iron and Steel

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