Microstructure and mechanical properties of Mo-Nb microalloyed medium Manganese trip Steel by cyclic quenching

Liu, Chunquan; Qi-chun, Peng; Xue, Zhengliang

doi:10.30544/426

Cited by 6 publications

(5 citation statements)

References 17 publications

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“…The investigation into the use of transformation-induced plasticity (TRIP)-assisted steels with multiphase microstructures has gained significant traction in developing durable but lightweight designs for vehicle body parts. [1][2][3][4][5] The genesis of TRIP steels can be traced back to Zackay et al 6 a discovery that paved the way for subsequent developments. Notably, Matsmura's breakthrough in 1987 revealed the allure of TRIP-assisted steels adorned with a composition of 50-60% allotropic ferrite, 20-30% bainitic ferrite without carbides, and highcontent retained austenite (RA).…”

Section: Introductionmentioning

confidence: 99%

“…An intriguing facet of molybdenum was its capability to impede the formation of the pearlite phase within the microstructure. 3,30,31 In recent years, there has been a notable increase in scholarly investigations that have focused on exploring the possible beneficial effects of micro-alloy combinations such as Mo-Cr 15 and Mo-Ti. 32 An analysis conducted by Sugimoto et al 15 revealed that adding 0.2% Mo and 0.5% Cr resulted in a mixed structure of bainitic ferrite matrix and retained austenite, contributing to increased yield strength and improved mechanical stability.…”

Section: Introductionmentioning

confidence: 99%

“…An intriguing facet of molybdenum was its capability to impede the formation of the pearlite phase within the microstructure. 3,30,31…”

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: Introductionmentioning

confidence: 99%

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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show abstract

“…In order to produce lightweight steels for vehicle bodies in response to simultaneously higher mechanical characteristics and lowered pricing [1][2][3][4], active research is being conducted on the TRIP-assisted steels that include multiphase microstructure. Zackay and colleagues [5] were the ones who made the discovery of transformation-induced plasticity (TRIP) steels, which is widely known.…”

Section: Introductionmentioning

confidence: 99%

Microstructure and mechanical properties of 0.2C-3.9Al-1.12Mn-0.3Mo δ-TRIP steel as a function of isothermal bainitic transformation temperature

GHOLAMBARGANI,

PALIZDAR,

KHANLAKHANI

2023

J Met Mater Miner

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The present investigation employed a two-stage heat treatment on a δ-transformation-induced plasticity (TRIP) steel comprising 0.2C–4Al–1.2Mn–0.3Mo (wt%). The mechanical and microstructural characteristics that result from varied isothermal bainitic transformation (IBT) temperatures following inter-critical annealing at 820℃ for 10 min are thoroughly analyzed. The microstructure of the steels consisted of δ-ferrite, α-ferrite, bainitic ferrite, retained austenite (RA), and martensite, resulting in an optimum combination of the ultimate tensile strength (UTS) and total elongation (TE). The results of the investigation showed that IBT temperature had an effect on the stability of RA and the martensitic transition. Due to the increased mechanical stability of RA, the study revealed that the TRIP phenomenon was more prominent at lower IBT temperatures. Both tensile and yield strengths, as well as elongation, decreased as a consequence of the increase in IBT temperature. Maximum values of UTS, TE, and the product of these two properties (PSE) are attained (860 MPa, 41%, and 35260 MPa∙%, respectively) under optimal processing conditions (at 350℃ IBT temperature in 10 min).

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“…In addition, the high Mn content in medium manganese steel is prone to segregation, the high C content is not conducive to welding, the Al element will lead to continuous casting problems and cracking in the hot rolling process, and the addition of Si will cause difficulties with hot galvanizing and other application problems. Therefore, there is a considerable gap between actual industrial production and the application of middle manganese steels, especially those with ultra-high-strength [18,19].…”

Section: Introductionmentioning

confidence: 99%

Effect of Heat Treatment on Microstructure and Mechanical Properties of New Cold-Rolled Automotive Steels

Huang

Chen

et al. 2020

Metals

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The effect of austenitizing temperature and aging treatment on the microstructure and mechanical properties of two new cold-rolled automotive steel plates (20Mn2Cr and 20Mn2CrNb) was investigated by using isothermal heat treatment, optical microscope, scanning electron microscope, microhardness tester, and tensile testing machine. The results show that as the austenitizing temperature increased, the original austenite grain sizes of both steels increased. The original austenite grain size of 20Mn2CrNb was smaller than that of 20Mn2Cr. The microhardness of 20Mn2CrNb gradually decreased with increasing aging temperature, while the hardness of 20Mn2Cr varied irregularly. The mechanical properties of 20Mn2Cr were better than those of 20Mn2CrNb under the same heat-treatment process. The effect of heat treatment on microstructure and mechanical properties was related to the martensite content, dislocation density, and precipitation of second-phase particles.

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Microstructure and mechanical properties of Mo-Nb microalloyed medium Manganese trip Steel by cyclic quenching

Cited by 6 publications

References 17 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 and mechanical properties of 0.2C-3.9Al-1.12Mn-0.3Mo δ-TRIP steel as a function of isothermal bainitic transformation temperature

Effect of Heat Treatment on Microstructure and Mechanical Properties of New Cold-Rolled Automotive Steels

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