Surface-Layer's Structure of X40CrMoV5-1 Steel Remelted and/or WC Alloyed with HPDL Laser

Dobrzański, L. A.; Bonek, M.; Klimpel, A.; Lisiecki, A.

doi:10.4028/www.scientific.net/msf.437-438.69

Cited by 16 publications

(13 citation statements)

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“…[1][2][3][4][5][6][7][8] Depending on the application, working conditions and the type of load and wear, different metallic, bimetallic or composite materials are used. [9][10][11][12] In the case of the manufacturing of building structures such as bridges, towers, industrial buildings and vehicles, particularly heavy vehicles such as trucks, trailers, semi-trailers, rail vehicles such wagons and tramcars, and also other utility vehicles and machines such as cranes, loaders, excavators, etc., the primary group of materials is structural steel. [13][14][15][16][17][18] The reason for this is the ease of forming and joining steel pieces, usually with welding technologies.…”

Section: Introductionmentioning

confidence: 99%

Laser welding of the new grade of advanced high-strength steel Domex 960

Kurc-Lisiecka¹,

Lisiecki²

2017

Mater. tehnol.

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The article presents the results of investigations on autogenous laser welding of the new-generation advanced high-strength steels (AHSS) Domex 960, classified as thermomechanically rolled steel by the manufacturer. There is little information about welding this steel grade, relating only to arc-welding methods. Therefore, a modern disk laser was used for the butt-joint welding of 5.0 mm steel sheets. The results of a microstructure study, tensile tests, technological bending tests, impact-toughness tests and also microhardness measurements showed that a low heat input during the laser welding of the new Domex 960 grade steel is advantageous. A low heat input and thus a high cooling rate of the weld metal and the heat-affected zone (HAZ) led to the formation of a favourable fine-grained microstructure, providing also high mechanical properties of butt joints, comparable to the properties of the base metal. Despite the high cooling rates, there was no significant increase in the microhardness measured across the butt joints. Moreover, a slight decrease in the microhardness was observed in the HAZ. Keywords: laserlaser welding, disk laser, thermomechanically rolled steel, advanced high-strength steel, fine-grained steel, properties of welded jointŝ lanek predstavlja rezultate preiskav avtogenega laserskega varjenja nove generacije naprednih visokotrdnostnih jekel (AHSS), jekla Domex 960, ki so ga proizvajalci opredeljujejo kot termomehansko valjano jeklo. Malo je informacij o varjenju te vrste jekla, nekaj le za metode oblo~nega varjenja. Za sole`no varjenje 5 mm debelih plo~evin je bil uporabljen modern diskasti laser. Rezultati {tudija mikrostrukture, nateznih preizkusov, tehnolo{kih upogibnih preizkusov, preizkusov udarne`ilavosti in tudi meritev mikrotrdote, so pokazali, da je ugoden majhen vnos toplote med laserskim varjenjem nove vrste jekla Domex 960. Majhen vnos toplote in zato velika hitrost ohlajanja kovine v zvaru in v toplotno vplivani coni (HAZ), povzro~i nastanek`eljene drobno zrnate mikrostrukture in tudi zagotavlja visoke mehanske lastnosti sole`nega zvara, v primerjavi z lastnostmi osnovne kovine. Kljub velikim hitrostim ohlajanja, ni bilo ob~utnega pove~anja mikrotrdote, izmerjene preko sole`nega zvara. Poleg tega je bilo v HAZ opa`eno rahlo zmanj{anje mikrotrdote. Klju~ne besede: lasersko varjenje, diskasti laser, termomehansko valjano jeklo, napredna visokotrdnostna jekla, drobno zrnato jeklo, lastnosti zvarjenih spojev

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Section: Introductionmentioning

confidence: 99%

Laser welding of the new grade of advanced high-strength steel Domex 960

Kurc-Lisiecka¹,

Lisiecki²

2017

Mater. tehnol.

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“…Moreover titanium shows great corrosion resistance in many environments, high biocompatibility, and also some titanium alloys show good heat resistance [2,5]. Thus, the combination of these properties and characteristics of titanium alloys have led to successful applications which demand high levels of reliable performance mainly in aerospace, military, automotive, chemical and power plant, petroleum and also in surgery and medicine, as well as in many other major industries [6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Tribological Characteristic of Titanium Alloy Surface Layers Produced by Diode Laser Gas Nitriding

Lisiecki¹,

Piwnik²

2016

Archives of Metallurgy and Materials

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In order to improve the tribological properties of titanium alloy Ti6Al4V composite surface layers Ti/TiN were produced during laser surface gas nitriding by means of a novel high power direct diode laser with unique characteristics of the laser beam and a rectangular beam spot. Microstructure, surface topography and microhardness distribution across the surface layers were analyzed. Ball-on-disk tests were performed to evaluate and compare the wear and friction characteristics of surface layers nitrided at different process parameters, base metal of titanium alloy Ti6Al4V and also the commercially pure titanium. Results showed that under dry sliding condition the commercially pure titanium samples have the highest coefficient of friction about 0.45, compared to 0.36 of titanium alloy Ti6Al4V and 0.1-0.13 in a case of the laser gas nitrided surface layers. The volume loss of Ti6Al4V samples under such conditions is twice lower than in a case of pure titanium. On the other hand the composite surface layer characterized by the highest wear resistance showed almost 21 times lower volume loss during the ball-on-disk test, compared to Ti6Al4V samples.

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“…Sometimes additionally the technological bending test is taken into account or the impact toughness. In practice, fatigue tests of welded joints are completely ignored [31].…”

Section: Introductionmentioning

confidence: 99%

“…Weldability is generally understood as the metallurgical weldability, which depends on the chemical composition, the structure of the welded material and the type of additional material [2,6,24,31].…”

Section: Introductionmentioning

confidence: 99%

“…Schematic illustration of thermomechanical rolling of microalloyed steels (TMCP) [6] This complex TMCP technology provides a two phase microstructure consisting of very fine ferrite grains and bainite and/or martensite, depending on the processing conditions and also on the chemical composition, thus carbon equivalent. Modern high strength and microalloyed steels have a low carbon equivalent and are therefore considered to be well weldable with low susceptibility to cracking [2,6,[29][30][31][32][33].…”

Section: Introductionmentioning

confidence: 99%

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Laser Welding of New Grade of Advanced High Strength Steel STRENX 1100 MC

Kurc-Lisiecka¹,

Piwnik²,

Lisiecki³

2017

Archives of Metallurgy and Materials

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The article presents results of investigations on autogenous laser welding of new grade STRENX 1100 MC steel. The modern Disk laser was applied for of 5.0 mm thick butt joints welding. The influence of laser welding parameters, mainly the energy input of laser welding on the penetration shape, weld quality, structure and mechanical performance was investigated. It was found that the investigated steel has surprisingly low carbon equivalent CET just 0.328, and also relatively high temperature of martensitic transformation M s at 430.6°C. Despite very rapid cooling times t 8/5 in a range from 0.6 to 1.3 s, thus rapid solidification there was no tendency to cracking of weld metal or HAZ. Significant drop of microhardness in the HAZ resulted in a decrease of tensile strength of joints, compared to the base metal. Impact toughness of test joints was at only 50÷60% of the base metal.

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Surface-Layer's Structure of X40CrMoV5-1 Steel Remelted and/or WC Alloyed with HPDL Laser

Cited by 16 publications

References 0 publications

Laser welding of the new grade of advanced high-strength steel Domex 960

Laser welding of the new grade of advanced high-strength steel Domex 960

Tribological Characteristic of Titanium Alloy Surface Layers Produced by Diode Laser Gas Nitriding

Laser Welding of New Grade of Advanced High Strength Steel STRENX 1100 MC

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