Effect of Low-Temperature Austempering and Quenching and Partitioning Treatments on Adhesive Wear Resistance of High-Silicon Multiphase Steels

Oliveira, Paulo Gonçalves de; Aureliano, Ricardo T.; Casteletti, Luíz Carlos; Filho, André Itman; Neto, Amadeu Lombardi; Totten, George E.

doi:10.1007/s11665-020-04699-9

Cited by 9 publications

(3 citation statements)

References 33 publications

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“…For all three treatment intervals, the microstructures were composed of plate or lath-like bainite (PB), granular bainite (GB), and blocks of martensite/ austenite (M/A). The microconstituents formed are consistent with those obtained for steels with similar chemical composition submitted to austempering treatment for 1 h [35] and also for bainitic steels submitted to other thermochemical treatments, such as boro-austempering, [12] indicating that maintenance in the CFE bath does not influence the phase transformation of the material.…”

Section: Resultssupporting

confidence: 83%

“…Previous studies show that in bainitic steels, the presence of niobium causes the morphology of retained austenite to change from film to blocks, whereas the bainite assumes a more granular aspect. [35,37] The combined addition of molybdenum and niobium is effective in mitigating these effects. The presence of molybdenum decreases the amount of granular bainite transformed from the cooled austenite, according to Hu et al [38] Thus, it is possible to obtain a microstructure composed mostly of bainite in plates, which is preferred from a mechanical point of view, as it reduces the free path for crack propagation.…”

Section: Resultsmentioning

confidence: 99%

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Production of Niobium Carbide Layers on High‐Strength Bainitic Steels by Thermochemical Treatment of Thermoreactive Diffusion Followed by Austempering

Oliveira

Triani

Filho

et al. 2021

steel research int.

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High-strength bainitic steels obtained by the low-temperature austempering heat treatment belong to the third generation of advanced high-strength steels. These materials were developed through innovative heat treatments of low-alloy steels to meet demands of the automotive industry, such as increased resistance-to-weight ratio. [1] Steels obtained by low-temperature austempering, at just above the martensite start (M s ) temperature, are characterized by the presence of carbide-free bainite (CFB). Silicon contents around 1.2À1.5 wt% are normally used to suppress cementite formation, enriching the austenite in carbon, which becomes metastable at room temperature, allowing the transformationinduced plasticity (TRIP) effect. [2,3] It is important to highlight the effect of molybdenum and manganese, used to increase hardenability, and the addition of niobium to refine the austenitic grain and increase bainitic transformation rates. [4,5] Regarding the microstructural characteristics of high-silicon bainitic steels, the presence of granular and plate bainite favors high combinations of strength and toughness, making them attractive for applications in the railway sector [6,7] and in the manufacturing of precision gears, providing stress and distortion-free parts as no quench is used. [8,9] Therefore, surface hardening techniques are of great technological interest to increase component lifespan and decrease maintenance time. Studies show the efficiency of techniques such as shot peening, nitriding, and boriding thermochemical treatments for this purpose. [9][10][11][12] Another promising alternative is thermoreactive diffusion (TRD) treatment, which, as in the boriding treatment, can be directly incorporated into the austempering process without the need for a new heating step, as used, for example, in the case of tempering after quenching for saving time and energy. TRD in conjunction with the austempering treatment has already been successfully applied to vermicular and ductile cast iron, where, after removal from the TRD bath, samples were directly cooled and held at 300 C in the austempering salt bath. [13] The TRD process involves the production of hard and highly resistant carbide layers in ferrous alloys. This treatment utilizes a

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Section: Resultssupporting

confidence: 83%

Section: Resultsmentioning

confidence: 99%

Production of Niobium Carbide Layers on High‐Strength Bainitic Steels by Thermochemical Treatment of Thermoreactive Diffusion Followed by Austempering

Oliveira

Triani

Filho

et al. 2021

steel research int.

Self Cite

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“…Gr [10] and Mn [11] are proved to enhance the fracture toughness of steels. Pedro et al indicated that the addition of niobium alloy is an effective method to increase the wear resistance of high strength steels [12].…”

Section: Introductionmentioning

confidence: 99%

The size effect of martensite laths and precipitates on high strength wear-resistant steels

Xue

Zhang

Zhu³

et al. 2021

Mater. Res. Express

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Low alloy high strength wear resistant steels are with high toughness, low cost and good abrasion resistance. It can effectively resist the propagation of wear cracks and prolong the service life of machine components. This paper focuses on the internal relationship between macroscopic physical properties and microscopic martensite lath and precipitate size throughout thickness of wear resistant steel. Four kinds of 40mm thickness wear resistant steels with different alloy chemical composition were produced and investigated. Results show the strength and hardness performance of ARIV are obviously higher than other three steels. ARI have a relatively large strength difference through thickness. The impact toughness of ARIV is relatively uniform, which is greater than that of the ARIII at middle layer and lower than that of the ARIII at 1/4 layer. The width of martensite lath of ARIV is relatively small, mainly 100 ~ 300 nm，while that of ARII and ARIII is mainly 200 ~400 nm. ARIV steel has shorter martensite lath band and more precipitates below 50 nm. It indicates that the size of martensite laths and precipitates of wear-resistant steels are important factors to determine its performance throughout thickness.

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Effect of Quenching and Partitioning Process on Microstructure and Properties of Mn-Si-Cr Steel

Yuan¹,

2022

J. of Materi Eng and Perform

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Effect of Low-Temperature Austempering and Quenching and Partitioning Treatments on Adhesive Wear Resistance of High-Silicon Multiphase Steels

Cited by 9 publications

References 33 publications

Production of Niobium Carbide Layers on High‐Strength Bainitic Steels by Thermochemical Treatment of Thermoreactive Diffusion Followed by Austempering

Production of Niobium Carbide Layers on High‐Strength Bainitic Steels by Thermochemical Treatment of Thermoreactive Diffusion Followed by Austempering

The size effect of martensite laths and precipitates on high strength wear-resistant steels

Effect of Quenching and Partitioning Process on Microstructure and Properties of Mn-Si-Cr Steel

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