Effect of Heat Treatment on Microstructure and Mechanical Properties of Low-Carbon TRIP Steel Tube

Zhang, Zi Cheng; Zhu, Fu Xian; Di, Hongshuang; Li, Yanmei; Manabe, Ken‐ichi

doi:10.4028/www.scientific.net/msf.654-656.290

Cited by 4 publications

(4 citation statements)

References 5 publications

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“…The presence of δ-ferrite could be attributed to the high Al content, which is a strong δ-ferrite phase stabilizer. 23,25,32 The distinction between δ-ferrite and α-ferrite might be made by classifying them as follows: α-ferrite was the product of the transformation of austenite by the ICA stage, whereas δ-ferrite originates from solidification and survives through the hot deformation. 45,46 The austenite phase was transformed into the bainitic ferrite phase following heat treatment at IBT temperature.…”

Section: Thermodynamic Analysismentioning

confidence: 99%

“…The reason is to delay carbide precipitation through the two-step heat-treatment process. 23,25 Yi et al 26 showed that the presence of aluminium up to 1.5 wt.% was a stabilizing element of the δ-ferrite, contributing to excellent tensile properties in all solid states. Bainite and δ-TRIP steels production might benefit from adding aluminium.…”

Section: Introductionmentioning

confidence: 99%

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Microstructural Design and Mechanical Enhancement of δ-TRIP Steel Through Mo Micro-alloying and Isothermal Bainitic Transformation

Gholambargani,

Palizdar,

Khanlarkhani

et al. 2024

Proceedings of the Institution of Mechanical Engineers, Part L:

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This research was done to investigate third-generation Advanced High-Strength Steel (AHSS) to improve mechanical properties and reduce production costs in the automotive industry. The potential of TRIP-assisted steel has been studied to address this issue, with a special focus on δ-TRIP steels. This research studied the δ-TRIP samples, which were micro-alloyed with 0.05 and 0.30 wt.% Mo, with isothermal bainitic transformation (IBT) time parameters. Microstructural analyses were conducted using optical microscopy (OM), field emission scanning electron microscopy (FE-SEM), and energy-dispersive X-ray spectrometry (EDX). The volume percentage of retained austenite (RA) phase, critical to achieving the requisite mechanical characteristics, was determined using X-ray diffraction (XRD). The analysis of the samples revealed a complex, multi-phased structure comprising δ-ferrite matrix, α-ferrite, bainite, RA, and martensite. The quantity and morphology of RA significantly influenced the resulting mechanical characteristics. The experimental results demonstrated yield stresses (YS) of 400–440 MPa, ultimate tensile strength (UTS) of 790–870 MPa, and total elongations to failure (TEL) of 24–34% in δ-TRIP steels containing 0.05 and 0.30 wt.% Mo alloy. The optimal combination of UTS and TEL (UTS × TEL) is achieved at an impressive 850 MPa × 32% (27200 MPa.%). This remarkable achievement was made possible by adding only 0.30 wt.% Mo and IBT, which were carried out at 450°C for 10 min. Focusing on the effects of Mo-alloy content and heat treatment duration on microstructure and mechanical characteristics, this study provided insights into enhancing the quality of δ-TRIP steel while decreasing manufacturing costs.

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Section: Thermodynamic Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Microstructural Design and Mechanical Enhancement of δ-TRIP Steel Through Mo Micro-alloying and Isothermal Bainitic Transformation

Gholambargani,

Palizdar,

Khanlarkhani

et al. 2024

Proceedings of the Institution of Mechanical Engineers, Part L:

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“…The good combination of strength and ductility of transformation induced plasticity steel results from the martensitic transformation of retained austenite during the plastic deformation process, which is called transformation induced plasticity effect [10,11]. To obtain the tubular materials with high strength as well as good plasticity, the authors have been introduced the transformation induced plasticity steel technique into tubular materials research and successfully developed the transformation induced plasticity seamless steel tube with two stage heat treatment using cold drawn steel tube [12,13]. The microstructure as well as the hydroformability have been studied.…”

Section: Introductionmentioning

confidence: 99%

Microstructure evolution of transformation induced plasticity seamless steel tube in hydraulic free bulge test

Zhang

Kong

et al. 2022

Materialwissenschaft Werkst

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In this study the hydraulic free bulge test with an internal pressure boosting velocities of 0.5 MPa/s and punch feeding speed of 0.2 mm/s was carried out to study the microstructure evolution of the transformation induced plasticity seamless steel tube in the hydroforming process. The microstructure of the selected parts of the tube after the hydraulic free bulge test were investigated with the optical microscope and transmission electron microscope. The transformation rate of the retained austenite to martensite of the selected parts were determined by the x‐ray diffraction. To study the deformation behavior and obtain the stress‐strain state of the tube, the finite element simulation of the hydraulic free bulge test was also carried out. The results show that the retained austenite in the microstructure of all the selected parts transformed to martensite after the hydraulic free bulge test. In the center part of the tube, the highest transformation rate of 82.84 % was obtained. The retained austenites distribute inside of the ferrite grains transform to martensite firstly under the compressive stress and strain state. The retained austenites distribute at the ferrite grain boundaries start to transforme into martensite when the tube is subjected to the tensile stress and strain.

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“…In order to meet the requirement of strength of the complicated hollow components and reduce the difficulty of its manufacture process, the materials with high strength as well as good formability are urgently desired . On the other hand, in the material research field the transformation‐induced plasticity (TRIP) steels developed in recent years exhibit a good combination of strength and ductility . The TRIP steels offer large dynamic energy absorption and thus leads to improved crash worthiness for better passenger safety .…”

Section: Introductionmentioning

confidence: 99%

Effect of Intercritical Annealing Time on Microstructure and Axial Mechanical Properties of TRIP Seamless Steel Tube

Zhang

Kong

et al. 2013

steel research int.

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The transformation-induced plasticity (TRIP) seamless steel tube, which is expected to be used in the hydroforming process, was prepared with piercing, cold-drawing and two-stage heat treatment process (intercritical annealing, "IA" and isothermal bainite treatment, "IBT"). The current study focused on the effect of IA holding time on microstructure and mechanical properties of TRIP seamless steel tube at a predetermined other heat treatment conditions, to maximize the volume fraction and stability of retained austenite as well as to obtain a TRIP seamless steel tube with good combination of strength and ductility. The microstructure and retained austenite volume fraction of the heat-treated steel tubes were studied via optical microscopy, transmission electron microscopy and X-ray diffraction. Twostage heat treatment carried out in an electrical resistance furnace and a salt-bath furnace showed that for a predetermined IA temperature, IBT temperature and time, the content of retained austenite as well as total elongation increased first and then decreased with increasing IA time in the set time range in this study. When IA time was 10 min, the largest retained austenite volume fractions for both steel tubes was obtained. As a result, the TRIP seamless steel tube with an austenite volume fraction of 7.02%, total elongation of 35.5% and ultimate tensile strength of 618 MPa was successfully obtained.

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Effect of Heat Treatment on Microstructure and Mechanical Properties of Low-Carbon TRIP Steel Tube

Cited by 4 publications

References 5 publications

Microstructural Design and Mechanical Enhancement of δ-TRIP Steel Through Mo Micro-alloying and Isothermal Bainitic Transformation

Microstructural Design and Mechanical Enhancement of δ-TRIP Steel Through Mo Micro-alloying and Isothermal Bainitic Transformation

Microstructure evolution of transformation induced plasticity seamless steel tube in hydraulic free bulge test

Effect of Intercritical Annealing Time on Microstructure and Axial Mechanical Properties of TRIP Seamless Steel Tube

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