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

Franceschi, Mattia; Pezzato, Luca; Settimi, Alessio Giorgio; Gennari, Claudio; Pigato, Mirko; Polyakova, Marina; Konstantinov, D. V.; Brunelli, Katya; Dabalà, Manuele

doi:10.3390/ma14020288

Cited by 26 publications

(13 citation statements)

References 44 publications

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“…Additionally, the distortion values after austempering are lower in most cases, since smaller thermal and phase transformation stresses are generated. In was also shown by [13] that corrosion resistance of the high silicon austempered steel increased with increases in the volume fraction of retained austenite due to lower amounts of residual stresses.…”

Section: Introductionmentioning

confidence: 94%

Influence of Austempering of As-Cast Medium Carbon High-Silicon Steel on Wear Resistance

Sedlaček

Klančnik²,

Nagode

et al. 2021

Materials

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The aim of this study was to evaluate the effect of austempering compared to quenching and low-temperature tempering on wear resistance of an as-cast medium carbon high-silicon steel intended for rock breaking. Austempering was done by isothermal holding at 270, 300 and 350 °C in molten salt baths, while quenching was done in water. The austempering treatments resulted in microstructural combinations of bainite and martensite. The isothermal holding at 270 °C resulted in bainite and self-tempered martensite, while isothermal holdings at 300 and 350 °C resulted in bainite and untempered martensite. The two quench and temper treatments resulted in tempered martensite. In general austempering resulted in lower hardness values when compared to quenching and tempering but higher impact toughness. The wear resistance was best for quenching and low temperature tempering, followed by austempering at 270 °C, but at slightly lower hardness and 25% higher impact toughness. The other two austempering treatments resulted in worse wear resistance.

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Section: Introductionmentioning

confidence: 94%

Influence of Austempering of As-Cast Medium Carbon High-Silicon Steel on Wear Resistance

Sedlaček

Klančnik²,

Nagode

et al. 2021

Materials

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“…3b. Various steels suitable for speci c applications are required to have bainitic microstructure and related purpose driven heat treatment studies have been carried out by researchers in recent time [25]- [28].…”

Section: Microstructural Transformationmentioning

confidence: 99%

Effects of Austempering on the Microstructure, Corrosion and Mechanical Properties of AISI 1018 Steel

Adigun

BODUDE

Adigun

et al. 2021

Preprint

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In this study, the effects of austempering on the microstructure, mechanical properties (micro hardness, impact energy and tensile strength) and corrosion behaviours of AISI 1018 low carbon steel were evaluated. The steel specimens were subjected to heat treatment by austenitizing at 830°C, maintained in this condition for 90 min before rapid cooling in a NaNO3 salt bath sustained at 300°C for isothermal transformation for additional 50 min and finally allowed to air cool to room temperature. The as-received and the austempered samples were tested for corrosion in both 0.5M aqueous acidic (HCl) and 0. 5M alkaline (NaOH) media. Microstructural investigation using scanning electron microscope (SEM) reveals transformation from ferrite/pearlite phases to bainite over the austempering process. Interestingly, significant improvements of 15.7% to 95.7% in the various mechanical properties (micro hardness, impact energy and tensile strength) and corrosion resistance in both media were observed.

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“…The studies of Franceschi M. et al [ 16 , 17 ] dealt with the influence of different or multi-stage tempering on the resulting mechanical and corrosion-resistant properties of bainitic steel. It is clear from their results that an increase in the austenitization temperature leads to an increase in the volume fraction of retained austenite.…”

Section: Introductionmentioning

confidence: 99%

Austenite Decomposition of a Lean Medium Mn Steel Suitable for Quenching and Partitioning Process: Comparison of CCT and DCCT Diagram and Their Microstructural Changes

et al. 2022

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The present work deals with the dilatometric study of a hot-rolled 0.2C3Mn1.5Si lean medium Mn steel, mainly suitable for the quenching and partitioning (Q&P) heat treatment in both hot-rolled or cold-rolled condition, subjected to a variation of austenitization temperature. These investigations were performed in a temperature range of 800–1200 °C. In this context, the martensite transformation start temperature (Ms) was determined as a function of austenitization temperature and in turn obtained prior austenite grain size (PAGS). The results show rise in prior austenite grain size due to increasing austenitization temperature, resulting in elevated Ms temperatures. Measured dilatation curves were confronted with the metallographic analysis by means of scanning electron microscopy (SEM). The present paper also focuses on the construction of a continuous cooling transformation (CCT) and deformation continuous cooling transformation (DCCT) diagram of the investigated lean medium Mn steel in a range of cooling rates from 100 to 0.01 °C/s and their subsequent comparison. By comparing these two diagrams, we observed an overall shift of the DCCT diagram to shorter times compared to the CCT diagram, which represents an earlier formation of phase transformations with respect to the individual cooling rates. Moreover, the determination of individual phase fractions in the CCT and DCCT mode revealed that the growth stage of ferrite and bainite is decelerated by deformation, especially for intermediate cooling rates. Microstructural changes corresponding to cooling were also observed using SEM to provide more detailed investigation of the structure and present phases identification as a function of cooling rate. Moreover, the volume fractions obtained from the saturation magnetization method (SMM) are compared with data from X-ray diffraction (XRD) measurements. The discussion of the data suggests that magnetization measurements lead to more reliable results and a more sensitive detection of the retained austenite than XRD measurements. In that regard, the volume fraction of retained austenite increased with a decrease of cooling rate as a result of larger volume fraction of ferrite and bainite. The hardness of the samples subjected to the deformation was slightly higher compared to non-deformed samples. The reason for this was an evident grain refinement after deformation.

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

Cited by 26 publications

References 44 publications

Influence of Austempering of As-Cast Medium Carbon High-Silicon Steel on Wear Resistance

Influence of Austempering of As-Cast Medium Carbon High-Silicon Steel on Wear Resistance

Effects of Austempering on the Microstructure, Corrosion and Mechanical Properties of AISI 1018 Steel

Austenite Decomposition of a Lean Medium Mn Steel Suitable for Quenching and Partitioning Process: Comparison of CCT and DCCT Diagram and Their Microstructural Changes

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