Microstructure and properties of an advanced high-strength steel after austempering treatment

Chen, Shang-Ping; Mostert, R.; Aarnts, Maxim P.

doi:10.1080/02670836.2021.1940425

Cited by 8 publications

(4 citation statements)

References 25 publications

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“…The cooling profile is selected according to a configuration of a line speed of 94 m/min in an existing annealing line. The austempering (partitioning) temperature is selected on the basis of the CCT diagram [13] and the TTT diagram [14] of a steel with a similar composition from previous studies conducted by the same authors. A small amount of ferrite (F) is allowed to form during cooling, which helps to enrich the remaining austenite with carbon on the one hand and to accelerate the bainitic transformation during austempering for TBF processes on the other hand.…”

Section: Methodsmentioning

confidence: 99%

“…In order to optimise the process parameters of 3G AHSS grades, a clear understanding of the microstructural evolution during heat treatment including cooling and isothermal holding is necessary. In the previous studies, the phase transformation and microstructure in the continuous cooling and the effect of austempering temperature on the microstructure and properties of a Si rich 3G AHSS grade [13,14] were studied. The CCT and TTT diagrams were established, from which the appropriate cooling rate and the optimum austempering temperature can be determined.…”

Section: Introductionmentioning

confidence: 99%

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Heat treatment effects on microstructure and properties of advanced high-strength steels

Chen

Mostert

Aarnts

2023

Materials Science and Technology

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The effects of the austempering time on the microstructure and properties of two third-generation high-strength steels are investigated for austempering (TBF), and for quenching and partitioning (QP). The process parameters are chosen according to the capacity of an existing continuous annealing or galvanising line. More than 10% retained austenite can be stabilised although carbides start to form at short overageing times with the simulated cycles. The product of the tensile strength and total elongation for TBF is higher than for QP, and it peaks with increasing austempering time for TBF, but decreases monotonously for QP. The hole expansion capacity for QP is higher than for TBF and it peaks with austempering time for both TBF and QP.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Heat treatment effects on microstructure and properties of advanced high-strength steels

Chen

Mostert

Aarnts

2023

Materials Science and Technology

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“…This is due to their low cost, aesthetic appeal, and corrosion resistance. 1,2 Among these, martensitic SSs, including AISI-420 grade, are applied in glass moulding, moulds for plastic injection, structural parts, cutting tools, automatic components, and dental and surgical instruments. 3 The effective use of steel in these applications demands high strength and exceptional wear resistance, which can be obtained by surface processing.…”

Section: Introductionmentioning

confidence: 99%

Surface modification of AISI-420 steel by cathodic cage plasma niobium nitride deposition

Naeem,

Raja,

Nolêto

et al. 2024

Materials Science and Technology

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AISI-420 martensitic steel is used in several applications due to its high corrosion resistance. A niobium nitride coating is deposited on steel by cathodic cage plasma deposition (CCPD) to upgrade the surface properties. The X-ray diffraction shows that the coating has a tetragonal Nb4N5 structure in each condition. The nano-hardness of the untreated sample (2.5 GPa) is increased up to 15.5 and 18.7 GPa at 400°C and 450°C, respectively. A ball-on-disc wear tester is applied for wear analysis, and the wear rate is found to be reduced up to six times by coating. This study shows that the CCPD can be used successfully for depositing niobium nitride coating with outstanding mechanical and tribological properties of AISI-420 steel.

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“…For this reason, the analysis of the microstructure and mechanical properties of the examined steels was carried out. Numerous papers on bainitic steels deal with isothermal bainitic transformation (Ref [18][19][20][21][22] and the correlation between the microstructure and mechanical properties. The tests have often suggested an optimal heat treatment as a better alternative to steel obtained by continuous cooling.…”

Section: Introductionmentioning

confidence: 99%

The Impact of Retained Austenite on the Mechanical Properties of Bainitic and Dual Phase Steels

Adamczyk‐Cieślak

Koralnik

Kuziak

et al. 2022

J. of Materi Eng and Perform

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This paper presents the microstructural changes and mechanical properties of carbide-free bainitic steel subjected to various heat treatment processes and compares these results with similarly treated ferritic–pearlitic steel. A key feature of the investigated steel, which is common among others described in the literature, is that the Si content in the developed steel was >1 wt.% to avoid carbide precipitation in the retained austenite during the bainitic transformation. The phase identification before and after various heat treatment conditions was carried out based on microstructural observations and x-ray diffraction. Hardness measurements and tensile tests were conducted to determine the mechanical properties of the investigated materials. In addition, following the tensile tests, the fracture surfaces of both types of steels were analyzed. Changing the bainitic transformation temperature generated distinct volume fractions of retained austenite and different values of mechanical strength properties. The mechanical properties of the examined steels were strongly influenced by the volume fractions and morphological features of the microstructural constituents. It is worth noting that the bainitic steel was characterized by a high ultimate tensile strength (1250 MPa) combined with a total elongation of 18% after austenitizing and continuous cooling. The chemical composition of the bainitic steel was designed to obtain the optimal microstructure and mechanical properties after hot deformation followed by natural cooling in still air. Extensive tests using isothermal transformation to bainite were conducted to understand the relationships between transformation temperature and the resulting microstructures, mechanical properties, and fracture characteristics. The isothermal transformation tests indicated that the optimal relationship between the sample strength and total elongation was obtained after bainitic treatment at 400 °C. However, it should be noted that the mechanical properties and total elongation of the bainitic steel after continuous cooling differed little from the condition after isothermal transformation at 400 °C.

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Microstructure and properties of an advanced high-strength steel after austempering treatment

Cited by 8 publications

References 25 publications

Heat treatment effects on microstructure and properties of advanced high-strength steels

Heat treatment effects on microstructure and properties of advanced high-strength steels

Surface modification of AISI-420 steel by cathodic cage plasma niobium nitride deposition

The Impact of Retained Austenite on the Mechanical Properties of Bainitic and Dual Phase Steels

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