Design of an effective heat treatment involving intercritical hardening for high-strength–high elongation of 0.2C–1.5Al–(6–8.5)Mn-Fe TRIP steels: Microstructural evolution and deformation behaviour

Li, Z. C.; Zhang, X. T.; Mou, Yanjie; Cai, Zhiping; Misra, R.D.K.; Lin, He; Li, H. P.; Ding, Hua

doi:10.1080/02670836.2020.1711614

Cited by 11 publications

(2 citation statements)

References 44 publications

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“…A number of studies were devoted toward understanding the factors that affect the stability of austenite, such as carbon content in austenite [27,28], austenite grain size [29,30], austenite morphology [30,31] and Schmidt factor [32,33], but studies on the degree of these factors are rare. From the above analysis, it can be seen that the hot-rolled steel A had an intense TRIP effect during deformation.…”

Section: Discussionmentioning

confidence: 99%

Tuning austenite stability in a medium Mn steel and relationship to structure and mechanical properties

Mou

et al. 2020

Materials Science and Technology

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We study here the underlying factors that govern the stability of austenite in a medium Mn (Fe–0.18C–11Mn–3.8Al) (wt-%) steel. In this regard, a novel heat treatment involving intercritical quenching and tempering was designed to obtain high total elongation (TEL) and high ultimate tensile strength (UTS) in the cold-rolled steel. And the UTS and TEL approached 920–1150 MPa and 35–65%, respectively. The product of TEL and UTS (PSE) exceeded 40 GPa%, with a maximum value of 60 GPa%. A detailed analysis of microstructure before and after tensile deformation revealed that the TRIP effect occurred and the stability of austenite was predominantly governed by the grain sizes of austenite rather than the orientation of austenite grains. The theoretical analysis of work hardening data suggested that the superior elongation of medium Mn TRIP steel is related to the high stability of austenite and the cooperative deformation of ferrite.

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Section: Discussionmentioning

confidence: 99%

Tuning austenite stability in a medium Mn steel and relationship to structure and mechanical properties

Mou

et al. 2020

Materials Science and Technology

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“…Transformation induced plasticity (TRIP) steel is a newly developed high-strength steel used for automotive application due to their excellent ductility, strong plastic product, and strain hardening index [5]. However, TRIP high-strength steel has a higher C, Mn, Si, Al, and other alloying elements with better weldability than other steels [6], [7]. In recent years, resistance spot welding is the primary welding method used to join the TRIP steels for automobile structure application [8].…”

Section: Introductionmentioning

confidence: 99%

Effect of Silica Content on Mechanical and Microstructure Behaviour of Resistance Spot Welded Advanced Automotive TRIP Steels

Paranthaman¹,

Sundaram

Natrayan

2021

Silicon

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The Significance of Microstructure Evolution on Governing Impact Toughness of Fe–0.2C–8.5Mn–3Al Medium‐Mn TRIP Steel Studied by a Novel Heat Treatment

Mou

et al. 2020

steel research int.

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Herein, the continuing challenge and scientific gap in obtaining high‐impact toughness in medium‐Mn steels are discussed. While addressing the challenge, the objective of the study described herein is to obtain a fundamental understanding via critical experimental analysis of the reasons underlying high‐impact toughness that is successfully obtained in Fe–0.2C–8.5Mn–3Al medium‐Mn transformation induced plasticity (TRIP) steel. This is enabled by a novel and effective heat treatment involving the combination of intercritical hardening and tempering to obtain high‐impact toughness. Electron microscopy and X‐ray diffraction studies clearly underscore the absence of TRIP effect in Fe–0.2C–8.5Mn–3Al medium‐Mn steel during impact and the volume fraction of austenite plays a determining role in governing impact toughness. The highest impact toughness of 255.96 J cm−2 is obtained when the steel is subjected to intercritical hardening temperature of 750 °C and low tempering temperature of 200 °C. The presence of martensite in the microstructure reduces the impact toughness on quenching from 800 °C. The fracture mode is ductile after intercritical hardening in the temperature range of 600–750 °C.

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Design of an effective heat treatment involving intercritical hardening for high-strength–high elongation of 0.2C–1.5Al–(6–8.5)Mn-Fe TRIP steels: Microstructural evolution and deformation behaviour

Cited by 11 publications

References 44 publications

Tuning austenite stability in a medium Mn steel and relationship to structure and mechanical properties

Tuning austenite stability in a medium Mn steel and relationship to structure and mechanical properties

Effect of Silica Content on Mechanical and Microstructure Behaviour of Resistance Spot Welded Advanced Automotive TRIP Steels

The Significance of Microstructure Evolution on Governing Impact Toughness of Fe–0.2C–8.5Mn–3Al Medium‐Mn TRIP Steel Studied by a Novel Heat Treatment

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