Effect of Aluminium and Manganese Contents on the Microstructure Development of Forged and Annealed TRIP Steel

Kučerová, Ludmila; Jirková, Hana; Volkmannová, Julie; Vrtáček, Jiří

doi:10.21062/ujep/146.2018/a/1213-2489/mt/18/4/605

Cited by 9 publications

(12 citation statements)

References 14 publications

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“…3) shows the continuous cooling transformation diagram of the steel austenitized at 1100 °C. The high content of Mn shifts ferritic and bainitic areas into right, which is caused by the potent hardenability effect of manganese [19,20]. This alloying element leads also to the reduction in the pearlite transformation start below 700 °C.…”

Section: Thermodynamic Calculationsmentioning

confidence: 99%

Dilatometric study of the phase transformations under conditions of recrystallized and non-recrystallized austenite in 3Mn–1.5Al steel

Morawiec

Grajcar

Kozłowska

et al. 2020

J Therm Anal Calorim

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This work presents the results of prior austenite state on the phase transformation behavior in a medium manganese steel alloyed with Al. The austenite was plastically deformed at two different temperatures. The first was at 1050 °C to ensure its recrystallization before cooling. The second treatment included deformation at 900 °C to keep high dislocation density in the austenite. The analysis of recrystallization process or its lack on the phase transformation behavior was analyzed. The study included thermodynamic calculations to analyze proper conditions of selected heat treatments. The dilatometric analysis of the phase transitions dependence on deformation temperatures was carried out. Deformation continuous cooling transformation diagrams were formed on this basis. The metallographic investigations were performed to determine microstructure constituents after cooling. The investigation proved the presence of ferrite untransformed during the austenitization step at 1100 °C. The dominant phase was bainite which was kept present up to 100 °C s−1 cooling rate. The amount of martensite increased with increasing the cooling rate. For the non-recrystallized austenite, more bainite was present in the microstructure for higher cooling rates compared to the recrystallized one. This was the result of higher density of preferable places for bainite nucleation in the non-recrystallized austenite. The Vickers hardness measurements were conducted after the applied heat treatments. The hardness of steel increased together with applying the higher cooling rates, which corresponded to the higher martensite amount. These values were higher for the non-recrystallized austenite because of higher dislocation density.

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Section: Thermodynamic Calculationsmentioning

confidence: 99%

Dilatometric study of the phase transformations under conditions of recrystallized and non-recrystallized austenite in 3Mn–1.5Al steel

Morawiec

Grajcar

Kozłowska

et al. 2020

J Therm Anal Calorim

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“…Despite it was partially replaced with aluminum, a certain amount of silicon (0.6 wt %) was added to improve solid solution strengthening. Furthermore, the addition of a very low percentage of niobium (0.06 wt %) ensures postponing of pearlite transformation and thus enables the use of relatively slow cooling rates [6], [14]. The JMatPro software was used to calculate CCT (continuous cooling transformation) diagrams of all three experimental steels.…”

Section: Experimental Programmentioning

confidence: 99%

“…Medium manganese steel is usually processed with hot rolling, cold rolling, and intercritical annealing, where the strain-induced martensite reverse transformation was proposed to enhance the yield and ultimate tensile strength. The ultimate tensile strength values were reported in a range from 800 to 1400 MPa with total elongation from 20 to 40% [5,6]. The decrease of weight is usually achieved by adding a light alloying element such as aluminum which also contributes to higher specific strength [7].…”

Section: Introductionmentioning

confidence: 99%

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Comparison of high strength steels with different aluminium and manganese contents using dilatometry

Hajšman¹,

Kučerová²,

Burdová³

2020

Manufacturing Technology

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In this paper, the properties of three low carbon steels containing different percentage of manganese (1.5 or 3 wt %) and aluminium (1.5 or 2 wt %) were tested using dilatometric analysis and metallography. The steels had chemical compositions typical for TRIP (Transformation induced plasticity) steels and the two steels with an increased manganese content already belonged to the third generation of AHS (advanced high strength) steels. The dilatometric measurement was employed not only to determine the characteristic transformation temperatures but also to simulate the heat treatment procedure commonly used for TRIP steels. Resulting microstructures obtained through this simulation were evaluated and compared. The two main alloying elements were proved to have a significant effect on the transition temperatures and thus on the processability and overall resulting properties of the material.

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“…Earlier grades of AHSS with manganese content around 20 wt.% exhibited elongation over 50% and strength up to 1000 MPa. Nevertheless, the current trend in AHSS development is to avoid any uneconomical alloying concepts, i.e., keeping the manganese content below 10 wt.% while maintaining the exceptional mechanical properties of the steel [3,4].…”

Section: Introductionmentioning

confidence: 99%

The Influence of Varying Aluminium and Manganese Content on the Corrosion Resistance and Mechanical Properties of High Strength Steels

Hajšman

Kučerová

Burdová

2021

Metals

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The aim of this paper is to evaluate the influence of small variations in chemical composition on the corrosion resistance and mechanical properties of low-manganese and medium manganese high strength steels. Six different steels with manganese content varying from 1.5 to 4.0 wt.% and aluminium from 0.008 to 6.5 wt.% were subjected to the analysis. The other subjects for evaluation included the effect of aluminium as a replacement for silicon, niobium microalloying and the effect of heat treatment. The effect of non-metallic inclusions on localized corrosion initiation and propagation was also documented. Using potentiodynamic testing, exposure testing, tensile and impact testing, it was found that the improvement in corrosion resistance associated with increasing aluminium content is accompanied by a significant deterioration of the mechanical properties. Niobium microalloying and heat treatment was found to have no quantifiable impact on the anti-corrosion properties. The effect of aluminium content proved to be superior to the effect of nonmetallic inclusions in terms of determining the overall corrosion resistance of the experimental steels.

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Effect of Aluminium and Manganese Contents on the Microstructure Development of Forged and Annealed TRIP Steel

Cited by 9 publications

References 14 publications

Dilatometric study of the phase transformations under conditions of recrystallized and non-recrystallized austenite in 3Mn–1.5Al steel

Dilatometric study of the phase transformations under conditions of recrystallized and non-recrystallized austenite in 3Mn–1.5Al steel

Comparison of high strength steels with different aluminium and manganese contents using dilatometry

The Influence of Varying Aluminium and Manganese Content on the Corrosion Resistance and Mechanical Properties of High Strength Steels

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