Microstructure Characterization of Laser-Welded Nb-Microalloyed Silicon-Aluminum TRIP Steel

Grajcar, A.; Różański, Maciej; Stano, Sebastian; Kowalski, A.

doi:10.1007/s11665-014-1118-1

Cited by 44 publications

(31 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The excellent mechanical properties of TRIP steel mainly contribute to the ferrite matrix, for ductility, bainite, for strength, and retained austenite, for uniform elongation produced by martensite transformation from austenite when subjected to external tensile stress. For the sake of the superior properties of TRIP steel, thinner steel sheets can be adopted for the same strength requirement to reduce the vehicle weight but improve the vehicle performance at the same time [2][3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Effects of Ar and He on Microstructures and Properties of Laser Welded 800MPa TRIP Steel

et al. 2018

View full text Add to dashboard Cite

Abstract. Fiber laser welding of cold rolled TRIP steel (transformation Induced Plasticity steel) sheet with tensile strength of 820MPa and thickness of 1.4mm was carried out using shielding gases Ar and He, respectively. For the same laser power and welding speed, the effects of different shielding gases on penetration and bead section morphologies were investigated. The microstructures and properties of the TRIP steel joints were also studied. The investigation showed that higher penetration and lower porosity could be obtained under shielding gas He using the same laser power and welding speed. The microstructures of the TRIP joint mainly included martensite and retained austenite. But the joint microhardness and tensile strength were higher under the shielding gas He. The tensile strength of the welded joint perpendicular to the weld line was equal to that of the base metal. But the tensile strength of the joint parallel with the weld line was higher than that of the base metal. The plasticity and formability of the welded joint were impaired due to the formation of martensite in the weld metal.

show abstract

Section: Introductionmentioning

confidence: 99%

Effects of Ar and He on Microstructures and Properties of Laser Welded 800MPa TRIP Steel

et al. 2018

View full text Add to dashboard Cite

show abstract

“…[10][11][12][13] Titanium alloys are also used for manufacturing parts for turbochargers, air and hydraulic pumps, turbines and impellers, etc. [14][15][16] In each of the above cases, the working surfaces are exposed to wear, mainly by erosion or cavitation erosion. 1,17 For example, the engines of planes, helicopters, and other aircraft, as well as rocket engines are often subjected to severe erosion from sand and dust particles, drops of rain, or other solid and hard particles in flight and also during manoeuvres at the airport or landing pad.…”

Section: Introductionmentioning

confidence: 99%

Erosion wear resistance of titanium-matrix composite Ti/TiN produced by diode-laser gas nitriding

Lisiecki¹,

Kurc-Lisiecka²

2017

Mater. Tehnol.

View full text Add to dashboard Cite

A prototype experimental stand equipped with a novel high-power direct diode laser (HPDDL), characterized by unique properties of the laser beam, was applied for producing titanium-matrix composite (TMC) surface layers during the laser gas nitriding (LGN) of the titanium alloy Ti6Al4V in the liquid state. The erosion wear characteristic of the substrate and nitrided surface layers was investigated. It was found that the erosion wear resistance of the composite surface layers is significantly higher than the substrate of titanium alloy Ti6Al4V. The erosion wear resistance depends on the angle of incidence. Reducing the angle of incidence decreases the weight loss of the composite surface layers and simultaneously increases the weight loss of the Ti6Al4V. It was found that the weight loss of the composite surface layer with the highest resistance is over six times lower compared to the Ti6Al4V, at an incident angle of 15°. Keywords: laser nitriding, titanium alloy, diode laser, erosion wear, composite Prototipno eksperimentalno stojalo opremljeno z novim diodnim laserjem velike mo~i (HPDDL), zna~ilnem po edinstvenih lastnostih laserskega`arka, je bilo uporabljeno za izdelavo povr{inske plasti kompozita na osnovi titana (TMC), med plinskim nitriranjem z laserjem (LGN) titanove zlitine Ti6Al44V, v staljenem stanju. Preiskovane so bile zna~ilnosti erozijske obrabe podlage in nitrirane povr{ine. Ugotovljeno je bilo, da je odpornost na erozijsko obrabo kompozitne povr{inske plasti ob~utno ve~ja v primerjavi s podlago iz titanove zlitine Ti6Al4V. Odpornost na erozijsko obrabo je odvisna od vpadnega kota. Zmanj{anje vpadnega kota zmanj{uje izgubo te`e povr{inke kompozitne plasti in hkrati pove~a izgubo te`e Ti6Al4V. Ugotovljeno je, da je izguba te`e kompozitne povr{inske plasti, z najve~jo odpornostjo, pri vpadnem kotu 15°, ve~kot {est krat manj{a v primerjavi z Ti6Al4V.

show abstract

“…However, on the other hand, carbides and carbonitride precipitates of Nb, V, and Ti effectively impede grain growth and significantly restrict the width of the coarse-grained area of the HAZ. [6][7][8] The HAZ ductility is significantly improved by Ti 2 O 3 particles, which are more stable than TiN particles and insoluble even at higher temperatures and act as nucleii by the nucleation of fine-lamellar ferrite. [9][10][11] Fine-lamellar ferrite within austenite grains increases the HAZ ductility.…”

Section: Introductionmentioning

confidence: 99%

Microstructure and properties of the high-temperature (HAZ) of thermo-mechanically treated S700MC high-yield-strength steel

Górka

2016

Mater. Tehnol.

View full text Add to dashboard Cite

The aim of the study was to determine the properties and microstructure of the high-temperature heat affected zone (HAZ) of S700MC steel heated to a temperature of 1250°C and cooled at different speeds. The simulation of the thermal cycles was performed using a welding thermal cycles simulator. Samples with a cross-section 10 mm × 10 mm × 55 mm were submitted to metallographic analysis, impact tests, hardness measurements and tensile tests. Welding thermal cycles with cooling times t8/5 = (3, 5, 10, 15, 30, 60 and 120) s and a maximum temperature cycle temperature of Tmax = 1250°C were used. The welding thermal thermomechanical processing cycles differ significantly, especially with high rates of heating and cooling in the SWC, short time holding at the maximum temperature and frequent overlap of two or more cycles during the multi-layer welding. One of the elements in the evaluation of steel weldability is the analysis of the austenite phase transformation during cooling. Steel hardness tests on simulated HAZ regions cooling times increasing from 3 s to 120 s, showed reductions by approximately 40 HV, while, regardless of the length of the cooling time t8/5, the impact resistance was very low, at the level of a few J/cm 2 . The tensile strength, hardness and toughness indicates a secondary role of austenite in the control of welded joints transformation strength and plastic properties, the analysis of the g-a phase transition not shown to be a reliable basis for assessment of the weldability of this steel group. Keywords: TMCP steel, welding thermal cycles, HAZ, high yield strength, impact resistance Namen {tudije je bil dolo~iti lastnosti in mikrostrukturo visokotemperaturne toplotno vplivanega obmo~ja zvara (HAZ) v jeklu S700MC, segretem na temperaturo 1250°C in ohlajenem pri razli~nih hitrostih. Simulacija procesa toplotnih ciklov je bila izvedena z uporabo simulatorja toplotnih ciklov pri varjenju. Vzorci s presekom 10 mm × 10 mm × 55 mm so bili metalografsko pregledani, izveden je bil udarni preizkus, izmerjena je bila trdota in izvedeni so bili natezni preizkusi. Uporabljeni so bili toplotni cikli pri varjenju s~asi ohlajanja t8/5 = (3, 5, 10, 15, 30, 60 in 120) s in maksimalna temperatura toplotnega cikla je bila Tmax = 1250°C. Pri varjenju se cikli varilno termi~nega in termomehanskega procesiranja precej razlikujejo, predvsem pri veliki hitrosti ogrevanja in ohlajanja v SWC, kratkotrajnem zadr`anju na maksimalni temperaturi in pogostem prekrivanju enega ali ve~ciklov pri ve~plastnih zvarih. Eden od elementov pri ocenjevanju varivosti jekla, je analiza premene avstenita med ohlajanjem. Pri preizkusih trdote simuliranih HAZ podro~ij, se le ta, s pove~anjem~asa ohlajanja od 3 s na 120 s, zmanj{a za okrog 40 HV, medtem ko je`ilavost zelo nizka in na nivoju nekaj J/cm 2 ne glede na~as ohlajanja t8/5. Natezna trdnost, trdota iǹ ilavost ka`ejo drugotno vlogo pri kontroli trdnosti in plasti~nosti transformiranega avstenita zvarjenih spojev. Analiza faznega prehoda g-a ni zanesljiva osnova za ugotavljanje varlj...

show abstract

Microstructure Characterization of Laser-Welded Nb-Microalloyed Silicon-Aluminum TRIP Steel

Cited by 44 publications

References 18 publications

Effects of Ar and He on Microstructures and Properties of Laser Welded 800MPa TRIP Steel

Effects of Ar and He on Microstructures and Properties of Laser Welded 800MPa TRIP Steel

Erosion wear resistance of titanium-matrix composite Ti/TiN produced by diode-laser gas nitriding

Microstructure and properties of the high-temperature (HAZ) of thermo-mechanically treated S700MC high-yield-strength steel

Contact Info

Product

Resources

About