Mechanical properties of ultra fine-grained HSLA and Ti-IF steels

Majta, Janusz; Muszka, Krzysztof

doi:10.1016/j.msea.2007.01.135

Cited by 35 publications

(23 citation statements)

References 5 publications

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“…More details about MaxStrain technology can be found in Ref. [31]. In the present work, three-axis plane-strain forging was carried out at room temperature (RT), 200 and 400°C with the application of 2-10 passes and up to 40 and 67 at 500 and 600°C.…”

Section: Methodsmentioning

confidence: 99%

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Multi-axial forging of Fe3Al-base intermetallic alloy and its mechanical properties

2016

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Tri-axial plane-strain forging was applied to the Fe-28Al-5Cr-0.8Zr-0.04B intermetallic alloy, in order to study its grain refinement and possible improvement in mechanical properties. The forging temperature range was from 20 to 600°C. The maximum number of forging passes was 67. The deformed microstructure was investigated using electron backscatter diffraction in a scanning electron microscope. At forging temperatures \500°C, the alloy was very prone to brittle cracking. At the temperature range of 500-600°C, the overall plasticity of material increased and the cracking tendency was reduced but not completely eliminated. Extensive processes of dynamic recovery/recrystallization were observed during forging at 600°C after 10-40 passes. Recrystallized areas with an average grain size of a few micrometers were observed. However, even after severe deformation at 600°C, resulting from 40 forging passes (e * 11.3), dynamic recrystallization was incomplete and the fraction of low-angle boundaries was still high. The Vickers microhardness substantially increased from 280 HV0.1 to 450 HV0.1 at the center of the sample after both deformations at room temperature as well as after 20-40 cycles at 500-600°C. However, a further increase of strain for a sample deformed at 600°C after 67 passes (e * 28) led to quite a significant hardness decrease at the center of the sample. This phenomenon could be associated with the initiation of dynamic recrystallization. None of the samples forged at the 500-600°C range exhibited any ductility improvement during subsequent tensile testing at room temperature, most likely, owing to the absence of a uniform ultrafine-grained structure developed during forging.

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Section: Methodsmentioning

confidence: 99%

“…Muszka et al [30,31] used multi-axial forging of IF and HSLA steel and achieved a total strain e c B 20 with an average grain size of 0.3 lm. Observed increase in strength and hardness was explained by beneficial structure changes of the investigated material.…”

Section: Introductionmentioning

confidence: 99%

Multi-axial forging of Fe3Al-base intermetallic alloy and its mechanical properties

2016

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“…below recrystallization temperature of c phase. The high density of lattice defects in austenite has a positive effect on both increasing the rate of bainite nucleation and growth as well as hampering of martensitic lamellas [7,9,19]. The result of thermo-mechanical processing and isothermal holding of the specimens at 400°C are microstructures presented in Fig.…”

Section: Effects Of Deformation and Cooling Conditions On Microstructurementioning

confidence: 99%

“…Advanced ultra-high-strength steels contain a higher fraction of hard phases, i.e. acicular ferrite, bainite or martensite [7][8][9][10] compared to AHSS containing polygonal ferrite as a matrix. A key microstructural constituent of advanced multiphase steels is retained austenite with the amount from 10 to 30 %.…”

Section: Introductionmentioning

confidence: 99%

Dilatometric study of phase transformations in advanced high-strength bainitic steel

Grajcar

Zalecki

Skrzypczyk

et al. 2014

J Therm Anal Calorim

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The work deals with dilatometric studies of a new-developed advanced high-strength bainitic 3Mn-1.5Al steel. Ferritic, bainitic and martensitic phase transformations are investigated in detail in respect of their temperature range forming and microstructures produced under various conditions of both continuous and isothermal cooling. The equilibrium temperatures of A e1 and A e3 and phase composition of the investigated steel were initially calculated whereas critical temperatures of A c1 and A c3 as well as the decomposition of retained austenite were determined upon heating. The major tests consisted of controlled cooling of undeformed or plastically deformed austenite using the dilatometer within the cooling rate range of 2-0.5°C s -1 . The effects of the cooling rate and deformation at temperatures of 900 and 1,050°C on the phase transformation behaviour and microstructure were explained. The final experiment was carried out using a thermo-mechanical simulator under conditions of multistep deformation and isothermal holding of the steel at 400°C. Microstructural features were revealed using light microscopy and scanning electron microscopy techniques.

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“…The objectives of the present work are experimental studies of the effect of the multiaxial compression on the grain refinement in microalloyed steel using MaxStain system [34] and an analysis of the evolution of the initial coarse microstructure into the ultrafine-grained structure with the use of three-dimensional FCA.…”

Section: Introductionmentioning

confidence: 99%

Three-dimensional frontal cellular automata modeling of the grain refinement during severe plastic deformation of microalloyed steel

Svyetlichnyy

Muszka

Majta

2015

Computational Materials Science

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Mechanical properties of ultra fine-grained HSLA and Ti-IF steels

Cited by 35 publications

References 5 publications

Multi-axial forging of Fe3Al-base intermetallic alloy and its mechanical properties

Multi-axial forging of Fe3Al-base intermetallic alloy and its mechanical properties

Dilatometric study of phase transformations in advanced high-strength bainitic steel

Three-dimensional frontal cellular automata modeling of the grain refinement during severe plastic deformation of microalloyed steel

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