Influence of Iron Carbide on Mechanical Properties in High Silicon-added Medium-carbon Martensitic Steels

Teramoto, Shinya; Imura, Masahito; Masuda, Yuki; Ishida, Toshinori; Ohnuma, Masato; Neishi, Yutaka; Suzuki, Takaya

doi:10.2355/isijinternational.isijint-2019-331

Cited by 16 publications

(10 citation statements)

References 14 publications

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“…Rod-like transition iron carbides formed in the interior of martensite during tempering at 200 °C. These carbides are usually referred to as ε- or η-carbides with hexagonal or orthorhombic crystal structure, respectively, as described in [ 9 , 31 , 32 ]. In the material investigated here, only η-carbides were found ( Figure 6 ).…”

Section: Resultsmentioning

confidence: 99%

“…On subsequent tempering, transition iron carbides (hexagonal ε-carbides and orthorhombic η-carbides) first form during low-temperature tempering (70–240 °C). The second transformation involves decomposition of retained austenite (200–300 °C), and the third tempering stage is characterized by the transformation of ε- or η-transition carbides to the more stable orthorhombic θ-cementite (200–450 °C) [ 6 , 7 , 8 ] when the silicon content is less than 2 wt%, while the monoclinic χ-carbides can also be formed before θ-cementite in steels alloyed with 2 wt% of silicon [ 9 ]. Mechanical properties, such as yield strength, tensile strength, and hardness, usually decrease during tempering.…”

Section: Introductionmentioning

confidence: 99%

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Effect of 1.5 wt% Copper Addition and Various Contents of Silicon on Mechanical Properties of 1.7102 Medium Carbon Steel

et al. 2021

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Requirements for mechanical properties of steels are constantly increasing, and the combination of quenching and tempering is the method generally chosen for achieving high strength in medium carbon steels. This study examines the influence of various silicon contents from 1.06 to 2.49 wt% and the addition of copper (1.47 wt%) on the behavior of 1.7102 steel starting with the as-quenched state and ending with the tempered condition at the temperature of 500 °C. The microstructure was characterized by SEM and TEM, the phase composition and dislocation density were studied by XRD analysis, and mechanical properties were assessed by tensile and hardness testing, whereas tempered martensite embrittlement was assessed using Charpy impact test and the activation energy of carbide precipitation was determined by dilatometry. The benefit of copper consists in the improvement of reduction of area by tempering between 150 and 300 °C. The increase in strength due to copper precipitation occurs upon tempering at 500 °C, where strength is generally low due to a drop in dislocation density and changes in microstructure. The increasing content of silicon raises strength and dislocation density in steels, but the plastic properties of steel are limited. It was found that the silicon content of 1.5 wt% is optimum for the materials under study.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of 1.5 wt% Copper Addition and Various Contents of Silicon on Mechanical Properties of 1.7102 Medium Carbon Steel

et al. 2021

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“…Many studies have investigated the deformation mechanism of martensitic steels focusing on the microstructure or the hieratical structure of mertensite. [4][5][6][7][8][9] Badinier et al 7) reported that the macroscopic yield strength is affected by variations in the local flow stress due to differences in the amount of cementite in different laths resulting from differences in the increase in dislocation density during quenching. Shibata et al 8) conducted bending tests with micro-cantilevers, showing that blocks play as obstacles for dislocation gliding.…”

Section: Inhomogeneity Of Plastic Deformation After Yielding In Lowcarbon Martensitic Steelsmentioning

confidence: 99%

Inhomogeneity of Plastic Deformation after Yielding in Low-carbon Martensitic Steels

Tanaka

Morikawa

Yoshioka³

et al. 2022

ISIJ Int.

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“…The decrease in yield strength with increasing Q T from 280°C to 320°C can be explained by the reduction of the volume fraction of TM, which has higher yield strength than FM. [21][22][23][24][25] The introduction of a small amount of FM, which provides mobile dislocation in surrounding softer phases, will also decrease yield strength. However, as the volume fraction of FM further increases as Q T increases from 320°C to 340°C, the yield strength increases due to the high hardness of FM.…”

Section: Mechanical Propertiesmentioning

confidence: 99%

“…It has been reported that yield strength of low carbon martensitic steel increased by tempering. [21][22][23][24][25] Song et al 23) explained that both a reduction of glissile non-screw type dislocation density by static recovery and a dislocation pinning by fine carbides formed on dislocations resulted in an increase of elastic limit at the early stage of uniaxial tensile test. In this study, it is though that increase in yield strength after tempering could also be attributed to the reduction of dislocation mobility.…”

Section: Mechanical Propertiesmentioning

confidence: 99%

Tensile Properties and Stretch-Flangeability of TRIP Steels Produced by Quenching and Partitioning (Q&P) Process with Different Fractions of Constituent Phases

Kim

Song

et al. 2021

ISIJ Int.

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The influence of microstructure on tensile properties and stretch-flangeability of TRIP steels with tensile strengths higher than 1.2 GPa has been investigated under various Quenching and Partitioning (Q&P) conditions. As lowering the quenching stop temperature, Q T , below Ms temperature in the range of 340°C to 280°C, volume fractions of tempered martensite and retained austenite increased and volume fractions of bainite and fresh martensite decreased in the final microstructure. The higher the Q T temperature in the range of 280°C to 330°C, the more the relative proportion of untransformed austenite at the end of the partitioning step was transformed into fresh martensite. The microstructural characteristics of fresh martensite and retained austenite under different Q T conditions were analyzed by EBSD. The fresh martensite phase was identified by a new method applying the threshold values of both Image Quality (IQ) and Kernel Average Misorientation (KAM). It is suggested that the decrease in the HER (Hole Expansion Ratio) value with increasing Q T temperature is due to the increase in the size and the volume fraction of fresh martensite particle.The mechanical properties of Q&P steels were evaluated before and after tempering at 200°C for 1 hour. Under conditions where the initial volume fraction of fresh martensite before tempering was higher, tensile elongation and HER values were improved by tempering. Tensile elongation was increased with the volume fraction of retained austenite. Lower HER values were obtained with higher volume fractions of fresh martensite, regardless of tempering.

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Influence of Iron Carbide on Mechanical Properties in High Silicon-added Medium-carbon Martensitic Steels

Cited by 16 publications

References 14 publications

Effect of 1.5 wt% Copper Addition and Various Contents of Silicon on Mechanical Properties of 1.7102 Medium Carbon Steel

Effect of 1.5 wt% Copper Addition and Various Contents of Silicon on Mechanical Properties of 1.7102 Medium Carbon Steel

Inhomogeneity of Plastic Deformation after Yielding in Low-carbon Martensitic Steels

Tensile Properties and Stretch-Flangeability of TRIP Steels Produced by Quenching and Partitioning (Q&P) Process with Different Fractions of Constituent Phases

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