Thermal and Mechanical Stability of Retained Austenite in Aluminum-containing Multiphase TRIP Steels.

Zwaag, Sybrand van der; Zhao, L.; Kruijver, Suzelotte O.; Sietsma, Jilt

doi:10.2355/isijinternational.42.1565

Cited by 75 publications

(23 citation statements)

References 16 publications

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“…Based on our previous study using atom probe tomography with a similar steel by this two-step intercritical treatment, the carbon content in the retained austenite was ~0.4 wt % [9]. The carbon concentration was much lower than the ~1 wt % in the retained austenite in the conventional TRIP steel [22,23]. In addition, high silicon and aluminum (~1.5 wt % in total) On the basis of our previous studies [8,11] on microstructure evolution and mechanism of retained austenite during the two-step intercritical treatment, the thermal stability of retained austenite in the present study upon tempering can be interpreted as follows.…”

Section:  Degreementioning

confidence: 94%

“…Based on our previous study using atom probe tomography with a similar steel by this two-step intercritical treatment, the carbon content in the retained austenite was~0.4 wt % [9]. The carbon concentration was much lower than the~1 wt % in the retained austenite in the conventional TRIP steel [22,23]. In addition, high silicon and aluminum (~1.5 wt % in total) were added in the studied steel, which can suppress carbide formation during tempering.…”

Section:  Degreementioning

confidence: 94%

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Thermal Stability of Retained Austenite and Properties of A Multi-Phase Low Alloy Steel

Xie

Xiong

Han

et al. 2018

Metals

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In this work, we elucidate the effects of tempering on the microstructure and properties in a low carbon low alloy steel, with particular emphasis on the thermal stability of retained austenite during high-temperature tempering at 500–700 °C for 1 h. Volume fraction of ~14% of retained austenite was obtained in the studied steel by two-step intercritical heat treatment. Results from transmission electron microscopy (TEM) and X-ray diffraction (XRD) indicated that retained austenite had high thermal stability when tempering at 500 and 600 °C for 1 h. The volume fraction was ~11–12%, the length and width remained ~0.77 and 0.21 μm, and concentration of Mn and Ni in retained austenite remained ~6.2–6.6 and ~1.6 wt %, respectively. However, when tempering at 700 °C for 1 h, the volume fraction of retained austenite was decreased largely to ~8%. The underlying reason could be attributed to the growth of austenite during high-temperature holding, leading to a depletion of alloy contents and a decrease in stability. Moreover, for samples tempered at 700 °C for 1 h, retained austenite rapidly transformed into martensite at a strain of 2–10%, and a dramatic increase in work hardening was observed. This indicated that the mechanical stability of retained austenite decreased.

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Section:  Degreementioning

confidence: 94%

“…Based on our previous study using atom probe tomography with a similar steel by this two-step intercritical treatment, the carbon content in the retained austenite was~0.4 wt % [9]. The carbon concentration was much lower than the~1 wt % in the retained austenite in the conventional TRIP steel [22,23]. In addition, high silicon and aluminum (~1.5 wt % in total) were added in the studied steel, which can suppress carbide formation during tempering.…”

Section:  Degreementioning

confidence: 94%

Thermal Stability of Retained Austenite and Properties of A Multi-Phase Low Alloy Steel

Xie

Xiong

Han

et al. 2018

Metals

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“…Improvements in mechanical properties of TRIP-assisted steels are related to relationships between chemical composition and microstructure (grain size, phase morphology and others) and stability of the retained austenite [4]. The stabilization of austenite at room temperature is enhanced by carbon enrichment during heat treatment [5].…”

Section: Trip (Transformation Induced Plasticity) Assisted Steels Belmentioning

confidence: 99%

Effects of Heat Treatment on Morphology, Texture and Mechanical Properties of a MnSiAl Multiphase Steel with TRIP Behavior

Salinas‐Rodríguez¹,

Artigas²,

Ipiña³

et al. 2018

Preprint

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: The effect that the microstructure exerts on the TRIP phenomenon and on the mechanical properties in a multiphase steel was studied. Samples of an initially cold-rolled ferrite-pearlite steel underwent different intercritical annealing treatments at 750 °C until an equal fractions of austenite/ferrite was reached; the intercritical treatment was followed by isothermal bainitic treatments before cooling the samples to room temperature. Samples in the first treatment were heated  directly to the intercritical temperature, whereas other samples were heated to either 900 or 1100 °C to obtain a fully homogenized, single phase austenitic microstructure prior to the conducting the intercritical treatment. The high temperature homogenization of austenite resulted in the decrease in its stability, so a considerable austenite fraction transformed into martensite by cooling to room temperature after the bainitic heat treatment. Most of the retained austenite transformed during the tensile tests, and as a consequence, the previously homogenized steels showed the highest UTS. In turn, the steel with a ferritic-pearlitic initial microstructure, exhibited higher ductility than the other steels and texture components that favor forming processes.     

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“…The detail of electrolytic cell and isolation process were present else where 12. The dried isolated and collected precipitates were analyzed using XRD technique to determine the type of the present carbides and/or carbo‐nitrides 13–16…”

Section: Experimental Workmentioning

confidence: 99%

Precipitation Behavior of Modified as Cast High Nitrogen Super Hard High‐Speed Tool Steel

Halfa

Mattar

Eissa

2012

steel research int.

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The properties of high‐speed tool steels can be improved by modifying their chemical composition or the technology of production. Nitrogen alloying is an attractive technology to enhance the mechanical and physical properties of tool steels. In this work, modified super hard high‐speed tool steel was produced through nitrogen alloying and decreasing the level of cobalt content in investigated steels. This work aims to study the effect of nitrogen as alloying element on carbides and carbo‐nitrides precipitates type, shape, and size for investigated steels. From the results obtained from Thermo‐Calc, it was concluded that nitrogen alloying produced large amount of stable austenite, also eutectic carbides precipitates (M6C and M7C3) were stable at room temperature. Transmission electron microscope (TEM) images for traditional grade showed that the as cast structure contains beside the carbides network other single carbides precipitates. While on the other hand the selected area diffraction pattern (SADP) images of nitrogen alloyed grade shows fine carbides and carbo‐nitrides precipitates with more amount of retained austenite in the ferrite matrix, they showed also the presence of the eutectic precipitates as well as the dislocations.

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Thermal and Mechanical Stability of Retained Austenite in Aluminum-containing Multiphase TRIP Steels.

Cited by 75 publications

References 16 publications

Thermal Stability of Retained Austenite and Properties of A Multi-Phase Low Alloy Steel

Thermal Stability of Retained Austenite and Properties of A Multi-Phase Low Alloy Steel

Effects of Heat Treatment on Morphology, Texture and Mechanical Properties of a MnSiAl Multiphase Steel with TRIP Behavior

Precipitation Behavior of Modified as Cast High Nitrogen Super Hard High‐Speed Tool Steel

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