Effect of Intercritical Annealing and Austempering on the Microstructure and Mechanical Properties of a High Silicon Manganese Steel

Franceschi, Mattia; Pezzato, Luca; Gennari, Claudio; Fabrizi, Alberto; Polyakova, Marina; Konstantinov, D. V.; Brunelli, Katya; Dabalà, Manuele

doi:10.3390/met10111448

Cited by 26 publications

(22 citation statements)

References 42 publications

(55 reference statements)

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“…In Figure 3 a.1,a.2 it is possible to observe a dual-phase microstructure consisting of different ferrite morphologies and martensite. A similar microstructure was observed also by the authors in a previous research [ 23 ]. The austempering treatment in this condition does not lead to bainite formation.…”

Section: Resultssupporting

confidence: 91%

“…Austempering at 400 °C produced a microstructure consisting of martensite ( Figure 5 c.1,c.2) without bainite, due to austempering at a temperature superior to Bs, as demonstrated in [ 23 ]. In the image are also indicated the trace of prior austenite grain boundaries (GB) with allotriomorphic ferrite (F A ) [ 22 ].…”

Section: Resultsmentioning

confidence: 81%

“…As state in ref. [ 23 ], this phenomenon could be explained by the carbon partitioning that changes Bs temperature, or due to the short soaking time at AT.…”

Section: Resultsmentioning

confidence: 99%

“…In all the patterns are visible BCC iron peaks related to ferrite and bainite, body-centered tetragonal iron peaks related to martensite, and FCC iron peaks related to the presence of retained austenite. Displacement between ferrite and martensite peaks should explained by the high martensite carbon content and strong cell distortion [ 23 , 36 ].…”

Section: Resultsmentioning

confidence: 99%

“…The authors in a previous work [ 17 ] reported results for the effect of different austenitizing conditions; as the austenitization temperature increased, a grain coarsening was observed. Moreover, this led to the presence of bainitic ferrite (BF), promoted by element diffusion [ 23 ].…”

Section: Introductionmentioning

confidence: 99%

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Effect of Different Austempering Heat Treatments on Corrosion Properties of High Silicon Steel

et al. 2021

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A novel high silicon austempered (AHS) steel has been studied in this work. The effect of different austenitizing temperatures, in full austenitic and biphasic regime, on the final microstructure was investigated. Specimens were austenitized at 780 °C, 830 °C, 850 °C and 900 °C for 30 min and held isothermally at 350 °C for 30 min. A second heat treatment route was performed which consisted of austenitizing at 900 °C for 30 min and austempering at 300 °C, 350 °C and 400 °C for 30 min. Scanning electron microscopy (SEM) and X-ray diffraction (XRD) have been used to evaluate the microstructural evolution. These techniques revealed that the microstructures were composed of carbide-free bainite, ferrite, martensite and retained austenite (RA) in different volume fractions (Vγ). An aqueous borate buffer solution with 0.3 M H3BO3 and 0.075 M Na2B4O7∂10H2O (pH = 8.4) was used for corrosion tests in order to evaluate the influence of the different volume fractions of retained austenite on the corrosion properties of the specimens. The results showed that when increasing the austenitization temperatures, the volume fractions of retained austenite reached a maximum value at 850 °C, and decrease at higher temperatures. The corrosion properties were investigated after 30 min and 24 h immersion by means of potentiodynamic polarization (after 30 min) and electrochemical impedance spectroscopy (after both 30 min and 24 h) tests. The corrosion resistance of the samples increased with increases in the volume fraction of retained austenite due to lower amounts of residual stresses.

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Section: Resultssupporting

confidence: 91%

Section: Resultsmentioning

confidence: 81%

“…As state in ref. [ 23 ], this phenomenon could be explained by the carbon partitioning that changes Bs temperature, or due to the short soaking time at AT.…”

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effect of Different Austempering Heat Treatments on Corrosion Properties of High Silicon Steel

et al. 2021

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Effect of Heat Treatment Processes on the Microstructure and Mechanical Properties of Spray‐Formed 440C Martensitic Stainless Steel

López-Morelos

Nadimpalli

et al. 2023

steel research int.

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Herein, 440C martensitic stainless steel (440C MSS) is manufactured by spray forming (SF) technology. Microstructural and mechanical properties such as strength, ductility, and toughness are evaluated after quenching and tempering–partitioning (Q–TP) and quenching–intercritical–quenching–tempering (Q–IQ–T) heat treatments. The microstructural features that control the deformation and fracture behavior of the heat‐treated specimens are discussed. The experimental results show that after austenitizing at 1050 °C, the material exhibits no apparent plastic deformation before fracture. However, specimens austenitized above 1050 °C and the specimen subjected to Q–IQ–T exhibit an improvement in the tensile properties by showing an elastic–plastic transition that is related to the strain‐induced martensitic transformation of retained austenite formed during the Q–TP process and to a decrease in the volume fraction of martensite with increasing austenitizing temperature. Also, it is observed that the strain hardening rate decreases with increasing austenitizing temperature. Furthermore, the stress–strain data suggest that the Q–IQ–T heat treatment effectively improves the toughness and ductility of the steel without compromising strength. The results indicate that the mechanical response of the SF‐440C MSS can be tailored by adjusting the heat treatment parameters to enable better design for industrial applications.

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Effect of Microstructure and Surficial Oxidation on the Wear Behavior of an UNS S41003 Stainless Steel

Faria

Moreira

Pinto

2023

steel research int.

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The UNS S41003 ferritic stainless steel is a low‐carbon alloy that has great corrosion and oxidation performances in wet and aqueous environments, as well as it has high mechanical strength and ductility when compared to the most ordinary low‐carbon steels. These great characteristics, allied to its relatively low manufacturing cost, have made it a potential option to replace structural steels in many applications. Although it is a current trend, there are still few published studies that relate this steel manufacturing process with microstructural evolution and mechanical behavior, mainly regarding its wear behavior, which is a substantial and sometimes limiting characteristic for its applications. In this context, this article presents a pioneering study about the use of biphasic microstructures (ferrite–martensite) and controlled surficial oxidation to enrich the wear behavior of a UNS S41003 steel type. This study concludes that, if well planned, both the increase of martensite fraction and the controlled growth of an adherent and compact oxide layer on the steel surface significantly improve its wear performance, decreasing its wear rate up to 93%.

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Effect of Intercritical Annealing and Austempering on the Microstructure and Mechanical Properties of a High Silicon Manganese Steel

Cited by 26 publications

References 42 publications

Effect of Different Austempering Heat Treatments on Corrosion Properties of High Silicon Steel

Effect of Different Austempering Heat Treatments on Corrosion Properties of High Silicon Steel

Effect of Heat Treatment Processes on the Microstructure and Mechanical Properties of Spray‐Formed 440C Martensitic Stainless Steel

Effect of Microstructure and Surficial Oxidation on the Wear Behavior of an UNS S41003 Stainless Steel

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