Two-Stage Heat Treatment of Steel 30CrMnSi and Its Optimization

Nekouei, Rasoul Khayyam; Akhaghi, Reza; Tahmasebi, R.; Ravanbakhsh, Arsalan; Moghaddam, Ali Jafari

doi:10.1007/s11041-016-0018-4

Cited by 5 publications

(3 citation statements)

References 10 publications

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“…The results showed that the diffraction angle of α (200) plane for the SQ1 specimen occurred at 64.68°, and with further increase in holding times from 1 to 5, 15, and 30 min at 720 °C, the corresponding diffraction angles of α (200) plane increased to 64.88°, 64.90°, and 64.93°, respectively. According to the Bragg's equation [ 29 ] shown, this deviation is mainly caused by the reduction of lattice distortion of martensite or ferrite microphases.

2 \text{d} sin \theta = \lambda

d = a / \sqrt{h^{2} + k^{2} + L^{2}}

where d is the interplanar spacing (Å), θ is the diffraction angle between the incident X‐ray and lattice plane (°), λ is the wavelength of incident ray (Cu Kα radiation: 1.54184 Å), and a is the lattice parameters (Å). According to Bragg's equation, the diffraction angle is inversely proportional to the interplanar spacing, which decreased with the increase in SQ holding times from 1 to 30 min at 720 °C.…”

Section: Resultsmentioning

confidence: 99%

“…The results showed that the diffraction angle of α (200) plane for the SQ1 specimen occurred at 64.68°, and with further increase in holding times from 1 to 5, 15, and 30 min at 720 °C, the corresponding diffraction angles of α (200) plane increased to 64.88°, 64.90°, and 64.93°, respectively. According to the Bragg's equation [29] shown, this deviation is mainly caused by the reduction of lattice distortion of martensite or ferrite microphases.…”

Section: Electron Microscopy and Alloying Element Partitioningmentioning

confidence: 99%

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Investigation of Micromechanical Properties of Martensite and Ferrite Microphases in a 35CHGSA Medium‐Si Low‐Alloy Steel

Khajesarvi,

Ghasemi Banadkouki,

Somani

et al. 2024

steel research int.

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The purpose of this study is to understand in detail the micromechanical behavior of martensite and ferrite microphases in a medium‐Si 35CHGSA dual‐phase (DP) steel by varying the martensite volume fractions (MVF) and ferrite phase constituents. Light microscopy combined with microhardness measurements is supplemented by field‐emission scanning electron microscopy, electron backscatter diffraction, transmission electron microscopy, and X‐ray diffraction in order to evaluate the micromechanical behavior of martensite and ferrite microphases in relation to the evolving microstructure. The experimental observations illustrate that ferrite microhardness diminishes sharply from 352 to 217 HV5g with the change in ferrite volume fraction (FVF) from 3 to 13%, beyond which it increases abnormally to 245 HV5g with a further increase in VF to 15%. The martensite microhardness too varies significantly depending on the progress of ferrite formation in the intercritical range. The hardness drops with further increase in FVF as a result of longer holding times. These observations are rationalized in part to the mutual interaction of martensite with ferrite, and the variation of martensite and ferrite alloying concentrations, developed as a result of ferrite formation during intercritical holding at 720 °C.

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2 \text{d} sin \theta = \lambda

d = a / \sqrt{h^{2} + k^{2} + L^{2}}

Section: Resultsmentioning

confidence: 99%

“…The results showed that the diffraction angle of α (200) plane for the SQ1 specimen occurred at 64.68°, and with further increase in holding times from 1 to 5, 15, and 30 min at 720 °C, the corresponding diffraction angles of α (200) plane increased to 64.88°, 64.90°, and 64.93°, respectively. According to the Bragg's equation [29] shown, this deviation is mainly caused by the reduction of lattice distortion of martensite or ferrite microphases.…”

Section: Electron Microscopy and Alloying Element Partitioningmentioning

confidence: 99%

Investigation of Micromechanical Properties of Martensite and Ferrite Microphases in a 35CHGSA Medium‐Si Low‐Alloy Steel

Khajesarvi,

Ghasemi Banadkouki,

Somani

et al. 2024

steel research int.

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show abstract

“…We consider the effect of austenitisation at three different temperatures followed by an ageing treatment to stimulate precipitation in the martensite that forms after cooling from the austenite phase field. Multiple precipitate ageing treatments are a common feature of processing [ 20 , 21 ] they introduce variety in the precipitate population and can induce the formation of additional phases. It is demonstrated how such a two-stage treatment can have dramatic effect on the mechanical properties of an alloy, data that are explained on the basis of detailed microstructural characterisation.…”

Section: Introductionmentioning

confidence: 99%

The Effect of a Two-Stage Heat-Treatment on the Microstructural and Mechanical Properties of a Maraging Steel

et al. 2017

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Maraging steels gain many of their beneficial properties from heat treatments which induce the precipitation of intermetallic compounds. We consider here a two-stage heat-treatment, first involving austenitisation, followed by quenching to produce martensite and then an ageing treatment at a lower temperature to precipitation harden the martensite of a maraging steel. It is shown that with a suitable choice of the initial austenitisation temperature, the steel can be heat treated to produce enhanced toughness, strength and creep resistance. A combination of small angle neutron scattering, scanning electron microscopy, electron back-scattered diffraction, and atom probe tomography were used to relate the microstructural changes to mechanical properties. It is shown that such a combination of characterisation methods is necessary to quantify this complex alloy, and relate these microstructural changes to mechanical properties. It is concluded that a higher austenitisation temperature leads to a greater volume fraction of smaller Laves phase precipitates formed during ageing, which increase the strength and creep resistance but reduces toughness.

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Two-step pre-processing enrichment of waste printed circuit boards: Mechanical milling and physical separation

Nekouei

Pahlevani

Rajarao

et al. 2018

Journal of Cleaner Production

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Two-Stage Heat Treatment of Steel 30CrMnSi and Its Optimization

Cited by 5 publications

References 10 publications

Investigation of Micromechanical Properties of Martensite and Ferrite Microphases in a 35CHGSA Medium‐Si Low‐Alloy Steel

Investigation of Micromechanical Properties of Martensite and Ferrite Microphases in a 35CHGSA Medium‐Si Low‐Alloy Steel

The Effect of a Two-Stage Heat-Treatment on the Microstructural and Mechanical Properties of a Maraging Steel

Two-step pre-processing enrichment of waste printed circuit boards: Mechanical milling and physical separation

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