Torsional Fatigue Strength of Newly Developed Case Hardening TRIP-Aided Steel

Sugimoto, Koh Ichi; Hojo, Tomohiko; Mizuno, Yuta

doi:10.3390/met7090375

Cited by 10 publications

(6 citation statements)

References 31 publications

(62 reference statements)

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“…The factors determining the presence of this phase lead to its stabilization thanks to the appropriate concentration of C, multi-stage heat treatment, and Si added to the steel, which contributes to a significant delay in the precipitation of cementite in bainitic ferrite [ 12 , 13 , 14 , 15 , 16 , 17 , 18 ]. Pioneering works in this area have been carried out for over twelve years, mainly in Japanese and German units [ 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 , 30 ]. However, the optimal parameters of hot working and cooling profiles to achieve the above-mentioned mechanical, technological, and operational properties have not been developed so far.…”

Section: Introductionmentioning

confidence: 99%

Kinetics of Austenite Phase Transformations in Newly-Developed 0.17C-2Mn-1Si-0.2Mo Forging Steel with Ti and V Microadditions

Morawiec¹,

Wojtacha²,

Opiela³

2021

Materials

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This work presents the results of phase transformation kinetics during continuous cooling in newly developed high strength low-alloy steel (HSLA). Initial theoretical calculations for the determination of heat treatment parameters were conducted. To determine the structural constituents formed due to the austenite decomposition the dilatometry approach was used. The material was cooled down from the austenitization temperature of 1000 °C with cooling rates between 0.1 °C/s to 60 °C/s. Then, light and scanning electron microscopy investigations were carried out. The microstructure after cooling at rates between 0.1 °C/s up to 1 °C/s is mainly ferritic with some fraction of granular bainite. Increasing the cooling rate led to formation of a higher fraction of bainitic ferrite. At 60 °C/s the microstructure was mainly bainite with some fraction of ferrite. To determine the presence of retained austenite, color etching using Klemm solution was used. The results show that the increase of cooling rate decreases the amount of retained austenite in the microstructure of the steel. Hardness measurements were made to determine the changes in the mechanical properties as a function of the cooling rate.

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Section: Introductionmentioning

confidence: 99%

Kinetics of Austenite Phase Transformations in Newly-Developed 0.17C-2Mn-1Si-0.2Mo Forging Steel with Ti and V Microadditions

Morawiec¹,

Wojtacha²,

Opiela³

2021

Materials

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“…In both steel notched specimens, no distinct fish-eye crack was observed (Figure 8(b)). Therefore, the decrease in the slope of vacuum-carburised and fine-particle peened steels may be mainly caused by low notch strength ratio or notch weakness (low notch constraint) as reported by the previous study [27].…”

Section: Discussionmentioning

confidence: 72%

Fatigue strength of a vacuum-carburised TRIP-aided martensitic steel

Sugimoto

Hojo

Mizuno

2018

Materials Science and Technology

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Fatigue properties of a transformation-induced plasticity-aided martensitic steel subjected to vacuum carburisation under carbon potentials ranging from 0.70 to 0.80 mass% and subsequent fine-particle peening were investigated for the fabrication of precision transmission gears. The fatigue limits of smooth specimens increased by 34–41% with increasing carbon potential, compared with that of heat-treated and fine-particle peened steel. The notched fatigue limits increased to a lesser degree except in case of carbon potential of 0.70 mass%. The increased smooth fatigue limits were associated with the high Vickers hardness and compressive residual stress via severe plastic deformation and the strain-induced martensitic transformation during fine-particle peening, as well as a 50% reduction of retained austenite fraction during fatigue deformation.

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“…Modern multiphase steels with retained austenite are the answer to the current requirements of the automotive industry. The requirements for innovative construction materials used for forgings ensure high strength, ductility, fracture resistance (also at reduced temperature) and high fatigue strength [ 1 , 2 , 3 , 4 , 5 ]. Obtaining the expected properties should take place at the lowest possible cost, which is related to the limitation of the amount of alloy additions introduced into the steel [ 6 , 7 , 8 , 9 ].…”

Section: Introductionmentioning

confidence: 99%

Hot Working Behavior in Multiphase Steel with Ti and V

Wojtacha

Opiela

2022

Materials

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This study investigated the effect of hot working conditions on changes in yield stress and the softening degree in the newly developed multiphase steel with Ti and V microadditions. The research was performed on the GLEEBLE 3800 thermomechanical simulator. In order to determine the σ-ε curves, continuous compression tests were carried out. The samples were plastically deformed at temperatures from 900 °C to 1100 °C at the rate of 0.1 s−1, 1 s−1 and 10 s−1. The activation energy of the plastic deformation was 375 kJ·mol−1. The analysis of the shape and course of the curves indicated that the decrease in strain hardening was mainly the result of the continuous dynamic recrystallization process. Two-stage compression with isothermal holding of the samples was also carried out between the two stages of deformation lasting from 1 s to 50 s. The structure of primary austenite was generated using the ARPGE software. The different size of austenite grain is the result of various thermally activated processes—when increasing the strain rate from 0.1 s−1 to 10 s−1, the average grain size of the primary austenite decreases from approx. 16 µm to approx. 6 µm. The time t0.5 needed to form 50% of the austenite fraction recrystallized at 1100 °C is approx. 4 s and extends to approx. 10 s with the reduction in the plastic deformation temperature to 900 °C. The time of complete austenite recrystallization tR, which varies from approx. 50 s to approx. 90 s in the tested temperature range, lengthens even more. The obtained results make it possible to develop thermomechanical treatment technology for the production of forgings from the tested multiphase steel.

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Torsional Fatigue Strength of Newly Developed Case Hardening TRIP-Aided Steel

Cited by 10 publications

References 31 publications

Kinetics of Austenite Phase Transformations in Newly-Developed 0.17C-2Mn-1Si-0.2Mo Forging Steel with Ti and V Microadditions

Kinetics of Austenite Phase Transformations in Newly-Developed 0.17C-2Mn-1Si-0.2Mo Forging Steel with Ti and V Microadditions

Fatigue strength of a vacuum-carburised TRIP-aided martensitic steel

Hot Working Behavior in Multiphase Steel with Ti and V

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